Yaesu FT-2400H User manual

FT-2400H Features
The FT-2400H is a special versión of Yaesu's top-of-the-line professional grade
commercial land mobile transceivers, intended for 2-meter FM operation in the amateur
radio service.
With its compartmentalized one-piece die-cast chassis, the FT-2400H provides 3-step
user-selectable power output up to 50 watts easily without forced cooling. Backlighting
for the large LCD (display), knobs and major but-tons is automatically controlled by a
photosen-sor, and the less-used buttons have a flip-down protective cover.
The thirty-one freely tunable memories can each be programmed with a 4-character chan-
nel ñame, which can then be displayed in place of frequency, as desired. Each memory
offers complete programmability and scanning func-tions, such as independent tx/rx
frequencies, independent repeater offset and CTCSS tone, programmable sean limits,
selectable sean resume modes and memory skip, priority moni-toring and a 1-touch
instant-recall CALL channel. Channel steps are user-selectable from 5 to 50 kHz, and
Automatic Repeater Shift can set standard repeater shifts when you tune to a repeater
subband. A 1750-Hz tone gener-ator is included in European versions.
A 38-tone programmable CTCSS encoder is built-in as standard, and the FTS-17A
CTCSS decoder unit can be installed to provide tone squelched prívate channels and a
CTCSS paging bell feature to sound a paging alert tone when the tone squelch opens.
Revolutionary DTMF (Dual-Tone, Multi-Fre-quency) -based selective calling and prívate
paging capabilities can be easily added with the optional FRC-6, controlled entirely from
the front panel. You can select any of 999 3-digit ID codes for your transceiver, and then
have your receiver stay quiet until your code is received (from any standard DTMF-
equipped transceiver). When a cali is received, the FT-2400H displays the calle r's code,
and a paging beeper can be set to sound and even to respond to the cali automatically.
Seven DTMF code memories store your ID plus those of six other frequently-called
stations or groups you wish to monitor.
Please read this manual carefully to become familiar with the FT-2400H.
Specifications
Specifications subject to change without notice or obliga-tion.
General
Frequency Range: 144 ~ 146 or 148 MHz, or 140 - 150 MHz Tx, 140 - 174 MHz Rx
Channel Steps: 5, 10, 12.5, 15, 20, 25 & 50 kHz
Frequency Stability: < 10 ppm (-20 to +60 °C)
Mode of Emission: F3
Antenna Impedance: 50 ohms, unbalanced
Supply voltage: 13.8V DC ± 10%, negative ground
Current Consumption (typical): Rx: 400 mA, Tx hi/med/low: 12/9/5A
Operating Temperatura Range: -20 to +60 °C
Case Size (WHD): 160 x 50 x 180 mm (w/o knobs)
Weight: 1.5 kg (3.3 Ib)
Transmitter
Output Power (high/med/low): 50/25/5W Modulation Type: Variable Reactance
Máximum Deviation: ± 5 kHz Spurious Radiation: less than -60 dB Microphone
Impedance: 2kí2
Receiver
Circuit Type: Double Conversión Superheterodyne
IFs: 21.4 MHz & 455 kHz
Sensítivity (for 12dB SINAD): better than 0.2 uV
Selectivity (-6/-60 dB): 12/30 kHz
IF Rejection: better than 70 dB
Image Rejection: better than 70 dB
Máximum AF Output: 2W into 8 ohms @10% THD
Accessories
FTS-17A CTCSS Unit p/n- A03700002
FRC-6 DTMF Pager Unit A03740001
MH-26G8J Hand Mic w/Burst A04290001
MH-27A8J DTMF Keypad Mic A04270001
SP-7 External Loudspeaker A03590001
Controls & Connectors
(1) POWER Button
Press this button to turn on the transceiver. Press and hold it for V^-second to turn it off.
2

(2) Microphone Jack
This 8-contact modular jack accepts trans-mit audio, tone cali (burst) or dial/memory
selection and scanning control from the mi-crophone, and provides receiver audio for a
speaker/mic. Memories can be copied to and from another ÍT-2400H through this jack,
and a packet tnc can be connected.
(3) SQL Control
This control sets the threshold level at which a received signal (or noise) opens the
squelch and can be heard. For máximum squelch sensitivity set this control from counter-
clockwise just until noise is silenced (and the "BUSY" indicator on the display is off)
when the channel is clear.
(4) VOL Control
This control adjusts the volume of the receiver audio and of the button beeper.
Function Buttons (behind flip-down door)
To open the flip-down door, pry the right edge (next to the selector knob) out gently with
a fingertip. To close the door, press upwards on the bottom edge of the door at its center.
Do not try to cióse the door by pushing from the front.
The five buttons behind the door control most of the programmable features. If the beeper
is enabled, one or more beeps will sound when a button is pressed, if the resulting
command is accepted. The white label shows the primary function of each button.
However, if you press the F/W button first, these buttons will perform altérnate functions.
On three of these, the alternate function is indicated by the blue label on or beneath the
button. These are described in the Operation chapter.
For descriptions in this manual, we refer to alternate button functions by preceding the
button name with "F/W —>" to remind you to press the F/W button first. For example,
"F/W —> LOW LOCK" indicates that you should press the F/W button followed by the
LOW LOCK button (within five seconds).
(5) RPT Button
This button toggles repeater shift: + (up), - (down) or off. The altérnate function displays
shift offset and ARS status.
(6) TONE Button
This button toggles the CTCSS (subaudible tone) features: encode (on transmission only),
encode/decode (on both transmission and reception), and off. If the optional FTS-17A Tone
Squelch Unit is not installed, only encode and off modes are available. The altérnate function
displays the CTCSS tone fre-quency and button beeper status.
(7) PAGE CODE Button
This button activates DTMF paging (or code squelch) if the FRC-6 Paging/Code Squelch
option is installed. The altérnate function displays DTMF Code Memories.
(8) CALL / BELL Button
(9) Press this button to jump to and from your CALL channel memory. The altérnate
func-tion toggles the CTCSS paging bell, described later.
(9) A / N STEP Button
While receiving on a memory, pressing this button toggles the display between fre-quency
and alphanumeric ñame. The altérnate function displays (and allows changing) the tuning
step size, and the scan-resume mode, as described later.
(10) Selector Knob
This 24-position detented rotary switch is used for tuning, memory selection and most
function settings. The DWNand UP buttons on the microphone duplícate the functions of this
knob.
(11) LOW LOCK Button
Press this button while receiving to toggle high/medium and low transmitter power (50/25
and 5 watts, respectively). The display shows "loh" (above the S-meter) when either low or
médium power is selected. The altérnate function of this button disables the selector knob
and most of the front panel buttons (except itself, F/W and POWER, and the microphone
buttons). Press F/W and this button again to unlock the panel.
(12) MHZ PRI Button
This button allows tuning in 1-MHz steps (the kHz digits blank on the display). If receiving
on a memory, pressing this button the first time activates the Memory Tune (MT) mode, and
pressing it again enables 1-MHz steps. The altérnate function of this button activates priority
monitoring, described in the Operation chapter ("P" displayed instead of the memory number
to the upper left of the frequency).
(13) REV SKIP Button
During split-frequency operation, such as through a repeater, this button reverses transmit
and receive frequencies. During memory operation, the altérnate function sets the current
memory to be skipped during scanning.
(14) J/ Button
This button switches operation between the two main tuning modes: dial and memory. The
altérnate function marks the current memory to be skipped during scanning. This button is
duplicated by a button on the mi-crophone in non-European versions.
(15) F/W Button
This button activates the altérnate functions (blue labels) of most of the other buttons. It
is also used to store current operating data into a memory (by holding it down for V2-sec-
ond, releasing and pressing again), and to toggle several programmable features.
(16) Display
The display segments are as shown below. The main digits on the display may show
operating frequency, memory ñame, or any of many parameters during setting, such as
tuning step size,
3

CTCSS tone frequency, or:
(17) 13.8V DC Cable Pigtail w/Fuse
This is the power supply connection for the transceiver. Use the supplied DC cable to
connect this pigtail to the car battery or other DC power supply capable of at least 12
Amperes (continuous duty). Make certain that the red lead connects to the positive side of
the supply- The fuse is 15-A, fast-blow.
(18) EXT SP Jack
This 2-contact mini phone jack accepts a 4-to 16-ohm external speaker such as the Yaesu
SP-3, SP-4, SP-7 or SP-55. Inserting a plug into the jack disables the internal speaker.
(19) ANT Coaxial Socket
Connect a 144-MHz antenna to this type-M (SO-239) socket using 50-ohm coaxial cable and
a type-M (PL-259) plug. Make sure the antenna is designed specifically for use on the
operating frequency.
Installation
This chapter describes installation of the FT-2400H with typical supplied accessories. Instal-
lation of internal options (the FRC-6 DTMF Paging/SelCall Unit and the FTS-17A CTCSS
Decoder Unit) are described at the back of this manual. If you have any of these options, turn
to Installation of Options at the back before installing the transceiver as described below.
Antenna Considerations
The FT-2400H is designed for use only with an antenna having an impedance near 50 ohms
on the 2-meter band. For optimum performance use a high qualify, carefully designed
antenna. The antenna should always be connected when operating the transceiver, to avoid
damage that could otherwise result if transmission occurs accidentally without an antenna.
Make sure your antenna is designed to han-dle 50 watts continuous transmitter power.
For best performance and safety in mobile installations, mount the antenna in the center of a
fíat surface, out of reach of human hands: 50 watts can cause an RF burn to anyone touch-ing
the antenna during transmission!
Also for best performance use the shortest possible length of thick, top-quality coaxial cable
for your feedline. Be sure to use a matching type-M plug for the jack on the transceiver.
Mobile Installation
The FT-2400H must only be installed in cars having a negative ground electrical system.
Mount the transceiver where the display, con-trols and microphone are easily accessible, us-
ing the supplied MMB-48 mobile mounting bracket. The transceiver may be installed in any
position, but should not be near a heater vent or where it could interfere with driving. Make
sure to provide plenty of space at the top and rear so that air can flow freely through the
heatsink. Refer to the diagrams on the next page for installation.
- Decide the mounting location with sufficient clearance for the transceiver, plus space for
ventilation above and behind the set. Use the mounting bracket as a témplate to mark the
locations of the mounting holes. Use a 4.8-mm (^ie") bit to drill the holes, and se-cure the
bracket with the four supplied long screws, washers and nuts (see diagram).
- Position the transceiver in the bracket so that the holes in the sides are aligned with those in
the sides of the bracket, and bolt the transceiver into place with the supplied short screws and
fíat washers.
- The microphone hanger may be installed wherever convenient.
Mobile Power Connections
To minimize voltage drop and avoid blowing the car fases, connect the supplied DC cable
directly to the battery termináis. Do not at-tempt to defeat or bypass the fuse — it is there to
protect you and the equipment.
- Before connecting the transceiver, check the voltage at the battery termináis while rev-ving
the engine. If it exceeds 15 volts, adjust the car regulator before proceeding.
- Connect the RED power cable lead to the POSITIVE (+) battery terminal, and the BLACK
4

lead to the NEGATIVE (-) terminal. If you need to extend the power cable use #14 AWG or
larger insulated, stranded copper wire. Connect the cable to the transceiver pigtail only after
connecting to the battery.
Warning!
Never apply AC power to the power cable of the transceiver, for more than 15 volts DC.
When replacing the fuse, use only a 15-A fast-blow type, Damage resulting from failure to
adhere to these precautions may not be covered by warranty.
Base Station Installation
Operation from the AC line requires a power supply capable of providing at least 12 A con-
tinuously at 13.8 V DC. We recommend using an external speaker, since the internal speaker
is mounted on the bottom of the transceiver. The FP-700 AC power supply/loudspeaker is
available from yourYaesu dealer to meet these needs. Use the DC power cable supplied with
the transceiver for making power connections, and connect the external speaker cable to the
speaker jack on the rear panel.
External Speakers
Using an external speaker with the FT-2400H lets you position the source of audio where it
is most convenient to overeóme back-ground noise in and around the car. The op-tional SP-7
External Speaker includes its own swivel-type mounting bracket, and is available from your
Yaesu dealer. Of course the older SP-3, SP-4 or SP-55 External Speakers may also be used.
Plugging in an external speaker disables the speaker in the transceiver.
Microphones
The MH-26Q8J handie microphone for the European versión B FT-2400H includes a but-ton
on the front for transmitting a 1750-Hz burst tone, to access repeaters that require it. The
MH-27A8J DTMF keypad microphone also includes a button on the front, which, when used
with a versión A FT-2400H, duplicates the D / MR, button on the front panel of the
transceiver.
Both microphone models include a PTT (Push-To-Talk) switch to actívate the transmitter,
and DWN and UP buttons for tuning and memory selection.
Operation
This chapter describes the transceiver functions in detail. After studying these descrip-tions,
keep the FT-2400H Operator's Quick Reference Card handy in case you need to re-fresh
your memory.
Preliminary Setup
Before operating the transceiver, recheck power supply and antenna connections, and
connect your microphone to the front panel jack. Never opérate the transceiver without a
proper antenna for the operating band. Also, please read the earlier Controls & Connectors
section, if you have not already, to familiarize yourself with the controls.
As mentioned before, references to altérnate button functions have "F/W —>" in front of the
button ñame to remind you to press the F/W button first momentarily, and then the other
button within five seconds (while "F" appears (in reverse) above the leftmost frequency digit
on the display). Don't hold the F/W button down, as that will give you a different result, and
don't press two buttons as the same time (except the PTT switch, when storing a sepárate
transmit frequency). When a button should be held down (as opposed to just pressed
momentarily) the instructions will say so.
Afive-second timer starts when you press f/h, and clears when you pressing a button to make
a new selection. If you don't make a selection in five seconds, the button functions return to
normal (white labels).
A button beeper provides useful audible feed-back when buttons are pressed, at a level deter-
mined by the volume control. Each button has a different beep pitch, and each function has a
unique beep combination. For example, when you press the LOW LOCK button, you will
hear a pair of low-, médium- or high-pitched beeps corre-sponding with the RF power level
selected. You can disable the beeper as described in the box on the next page, but we
recommend you keep it enabled while getting to know the controls.
Turning Power Off
To turn the transceiver off, you must press and hold the POWER button for V2-second.
Beeper Disabling
If you want to turn the beeper off(or back on), you can press F/W —> TONE-» F/W —>
TONE (each button twice, alternately). If you lock the controls (page 14) and have the
beeper enabled, pressing a button will sound a dif-ferent musical note for as long as it is
held.
If you have trouble getting the transceiver to work as described, see In Case of Problems on
page 34.
5

Squelch Setup
Before turning on the transceiver for the first time:
O Preset the VOL and SQL controls fully counter-clockwise.
O Then press the POWER button (if the transceiver is off) and adjust the VOL control for
comfortable volume on the noise or any received signal. "BUSY" should be displayed in
reverse letters at the far left.
O If you hear a signal, turn the selector knob to a clear channel (only noise).
O Turn the SQL knob clockwise just to silence the noise. The "BUSY" indicator will disap-
pear. Setting the SQL further clockwise reduces sensitivity to weak signáis. Whenever a
signal reaches the receiver that is strong enough to open the squelch, "BUSY" will be
displayed.
Note that while receiving, one or more bar-graph segments may appear at the lower left
córner of the display, indicating signal strength of received signáis. This is not affected by
the squelch setting, so even squelched signáis can give some indication. If more than two
bar-graph segments appear while the squelch is closed, try reducing the squelch control
setting (if you want to hear weak signáis).
Frequency Selection Modes
Dial Mode
This mode is for tuning or scanning the band when looking for a channel on which to
operate, when you don't have a specific frequency in mind. In this mode, the selector knob
and mi-crophone buttons each tune the band in the selected step size, or in 1-MHz steps, and
the scanning function tunes in the selected step size.
Memory Mode
This mode is mainly for operating only on specific frequency channels known in advance
(and programmed into the memories). For ex-ample, after storing the frequencies of your lo-
cal repeaters into memories, you can confine operation to those channels by selecting the
memory mode. In this mode, the selector knob, microphone buttons and scanning function
se-lect sequentially from the stored memories. The FT-2400H gives you 31 memories, each
of which can store repeater shift and direction, CTCSS settings, and sepárate receive and
transmit frequencies. There is also a Memory Tune mode, in which you can tune just like the
dial mode, and store the resulting retuned memory into the same or another memory. This
and other special memory mode functions are described later, but you will want to keep these
terms in mind.
You can tell at a glance which channelling mode is in by looking in the shaded memory box
above and to the left of the frequency display. If the box is empty, you are in the dial mode.
If you see a number or an "/.", "U" or "C" in the box, you are in the memory mode.
The D / MR button near the top right córner of the display (and the button on the front of the
MH- 27A8J microphone) toggles between the dial and memory modes. While in the memory
mode, your previous dial mode selections are preserved. Also, when you switch from the dial
to the memory mode, the last-selected memory is recalled.
Frequency & Step Selection
You can select a new operating frequency from either the dial mode or by retuning a
memory. For now, we suggest using the dial mode. If you see a memory number in the mem-
ory box, press the D / MR button to switch to dial
mode. There are two ways to select your operating frequency: by the selector knob, or with
the microphone buttons. However, holding one of the microphone buttons for more than ½
second starts the scanner. This is described later, but if you've already started it, just press a
microphone button again to stop.
To select the MHz range in which you wish to opérate: first press the MHZ PRI button above
the selector knob so that the kHz digits are blanked, and then turn the knob. To return to
normal tuning and display, just wait five sec-onds, or press MHZ PRI again to redisplay the
kHz digits, and then turn the selector knob.
Locked Controls
If nothing happens when you press a button or turn the selector knob, the controls may be
locked. Check for "LOCK" at the top leñ córner of the display, and if you see it, press F/W
—> LOW LOCK to unlock the controls. Later you will want to enable the lock (with the
same button sequence) to prevent having your settings disturbed. Pressing buttons while
locked sounds different musical notes for as long as a button is held, but only the unlocking
sequence affects operation.
Default channel (tuning) steps are 5 kHz in versión A, and 12.5 kHz in versión B (for
Europe). To select another step size, press F/W—» A/N STEP, turn the selector knob for the
desired steps, and press A/N STEP again. See the box above if the buttons or knob fail to
opérate.
Transmitting
Press the D / MR button at the upper right, several times, if necessary, to select low power
output. The display will return to normal after a few seconds, and "LOW" is displayed to the
left of the memory box (when either low or médium power is selected). When you wish to
transmit, wait until the channel is clear ("BUSY" not displayed), and squeeze the PTT switch
on the microphone while talking across the front of it. During transmission, "TX" appears at
the left side of the display, and the S&PO bargraph shows relative transmitter power output
(4 segments for low power, 8 for medium, and full-scale for high). Release the PTT switch to
receive.
If you require more power press the LOW LOCK button again (to switch to medium or high
power). However, we recommend using low power whenever possible to minimize possible
inter-ference, current consumption and heating.
If using a European versión, press the button on the front of the microphone to transmit a
1750-Hz Burst Tone to access repeaters that require it.
6

Repeater Splits
The FT-2400H offers several methods to set up split frequency operation for repeaters: man-
ual (band, and memory-specific), automatic (ARS) and independently stored transmit/re-
ceive frequencies. The manual and automatic methods shift the transmit frequency above or
below the receive frequency by a programmable offset. This offset is preset at the factory to
600 kHz, but can be easily changed as described in the box at the right.
When in the dial mode, only one offset at a time can be used. This offset can only be
changed while in the dial mode, and is applied any time repeater shift is activated (manually,
or by ARS) in the dial mode. For repeaters that require an odd split, you can either program a
memory-specific offset, or store an independent transmit frequency in the same memory.
These methods are described later in the discussion on memories.
To actívate the standard shift manually, just press the RPT button: once for minus shift,
again for plus shift, and again to return to simplex. A small"-" or "+" sign appears at the top
center of the display when minus or plus shift is selected, respectively.
Example: To operate through a 146.34/146.94 MHz repeater:
O Tune the display to 146.94 MHz (to receive on the output frequency).
O Press rpt once. A "-" (minus) should appear at the top center of the display (if not keep
pressing rpt until it does).
When the channel is clear, press the PTT switch on the microphone and send your callsign.
The display should shift to 146.34 MHz while you transmit.
Of course this example only works if the offset is set to 600 kHz, as supplied from the
factory. You can change it as described in the box on the previous page.
With repeater split activated, you can reverse the transmit and receive frequencies by
pressing the REV SKIP button above the selector knob.
Use this to display the transmit frequency without transmitting, and to check the strength of
signals on a repeater uplink frequency. The repeater shift sign blinks while reverse split is
selected. Press REV SKIP again to return to the normal
shift direction.
Changing Repeater Offset
To display the current repeater offset, press F/W-> RPT. The offset is displayed in MHz, to
three decimal places. You can change the offset in 50-kHz steps with the selector knob or
microphone DWN and UP buttons. In most cases you will want to keep the repeater offset
programmed to the most commonly used split in your área.
Also, you can enable/disable ARS (Automatic Repeater Shift), by pressing F/W at any time
while the offset is displayed. An "A" appears in the memory box when ARS is enabled.
When set as desired, press the RPT button to return the display to the operating frequency.
Automatic Repeater Shift
The ARS (Automatic Repeater Shift) feature activates repeater offset automatically when-
ever you tune to the standard repeater sub-bands (see chart below). With this feature enabled,
a small "-" or "+" at the top center of the display indicates that repeater shift is active, and
closing the push-to-talk switch changes to the (shifted) transmit frequency.
The ARS function is disabled at the factory. See the box on the previous page to enable it.
As already mentioned, you can use the manual shift method (rpt button) at any time to select
a new shift state, whether ARS is activated or not. However, if you change frequency inside
a repeater subband with ARS activated, manual repeater shift selections are cancelled.
Simple Memory Storage & Recall
The FT-2400H offers 31 memories, labelled 1 ~ 28, C, L and U. Each can initially store the
current operating data from the dial mode or a retuned memory. Once a memory has been
stored, its repeater shift and offset, CTCSS tone data and settings for the DTMF Paging and
CTCSS options can be modified, a 4-character name can be assigned, and a separate transmit
Automatic Repeater Shift - Repeater Subbands
145.1 145.5 146.0 146.4 146.6 147.0 147.4 147.6 148.0
Version A --------------- ++++++++++ ----------- +++++++ --------------
Version B 145.6 ----- 145.85
frequency can be stored. Memory C (the CALL channel memory) can be recalled instantly
by the CALL BELL button, and memories L and U store programmable subband limits,
described later, in addition to general purpose operation.
To store a frequency in memory:
O Select the desired frequency (and repeater split direction, if desired) in the dial mode as
already described, or by retuning a memory.
O Press and hold the F/W button for ½ second, until a second beep sounds. A memory
number or letter appears blinking in the memory box.
O Within five seconds of pressing F/W, use the selector knob or microphone DWN and UP
buttons to select the desired memory for storage (in the memory box). If you select one that
was already being used, it will be overwritten with new data in the next step.
O Press F/W momentarily to store the displayed data into the selected memory. The
memory label will stop blinking for a second, and then disappear as operation continues in
the dial mode.
Example: Store the 146.34/146.94 repeater data in memory 5.
O First perform the steps in the example on page 15 to set up the desired frequency and
offset on the dial.
O Press and hold the F/W button for ½ second to display a memory label in the memory
box, then do the next step within 5 seconds.
O Turn the selector knob so that "5" (the memory number to store) shows in the memory
box.
O Press F/W again, momentarily. That's it. The dial data has been stored in memory 5.
After a few seconds the memory box will clear, and you are left operating on the dial.
7

To confirm that this worked, turn the selector knob to change the dial frequency (to any-
thing), then press D / MR, to change from dial to memory mode. The numeral 5 should
appear in the memory box, and 146.94 (the receive frequency) should appear on the display.
Press REV SKIP confirm the transmit frequency of 146.34 MHz.
You can use any memory (except C, the CALL channel) with the same result. Memory C re-
quires a slightly different procedure. Notice that pressing D / MR from the dial mode always
recalls the last stored or used memory.
Recalling Memories
In confirming the results of the last example, we used the D / MR button to change from the
dial mode to the memories after they were stored. The memory label appears in the memory
box at the upper left corner of the frequency display whenever operating on a memory.
When more than one memory has been stored, you can select a memory for operation with
either the selector knob or the microphone DWN and UP buttons. If you use the microphone
buttons, press and release the button for each memory: if you hold the button down for 1/2
second, memory scanning will start.
Odd-Split Memories
After storing a frequency, with or without repeater shift, from the dial, you can modify the
repeater shift and offset of that memory only. Just recall the memory, press RPT as necessary
to set the shift direction, and then follow the steps in the "Changing Repeater Offset" box on
page 15. If you want to make the new offset permanent for that memory, remember to press
and hold the F/W button for Va-second, until the second beep sounds and then press it again
momentarily. Of course you could also store a separate transmit frequency in the memory
(described later) to obtain the same result, but you may find this more straightforward when
dealing with repeaters.
Naming Memories
Once you have stored a memory, you can assign it a name to be displayed when it is recalled,
in place of the frequency. Names can be up to four characters long, using capital A ~ Z, 0 ~ 9
and an underline. To store a name, first store the memory and then recallit as already
described.
O Press and hold the F/W button for ½ second, until the second beep sounds and the mem-
ory number starts blinking in the memory box.
O Within five seconds of pressing F/W, press the A/N STEP button. Unless a name was
previously stored for this memory, the frequency will be replaced by ("-- -- -- “), with the
first pair of hyphens blinking.
O You can now use the selector knob to choose the first character of the name to be dis-
played.
O After selecting the desired character, use MHZ STEP or the microphone DOWN and UP
buttons to get the next pair of hyphens blinking, and use the selector knob to set this
character.
O Repeat the last step until all characters are set as desired, and then press A/N STEP,
twice. At the first press, the display will return to the memory frequency. After the second
press, the memory name will be displayed — for this and any other memories that have been
assigned names (unnamed memories will still be displayed as channel frequencies).
Once you have stored names for several memories, you can toggle between frequency and
name views for all of them at any time while receiving on a memory, by pressing A/N STEP
CALL Channel Memory
Although invisible to the memory recall method described so far, the CALL channel memory
can be instantly toggled by the CALL BELL button. "C" appears in the memory box when
the CALL memory is active. The factory default for the CALL channel memory is the
bottom edge of the band. You can reprogram it from the dial with any frequency and repeater
state, or even a separate transmit frequency. After storing the frequency, you can also set and
change repeater settings, and give it a name to display in place of frequency, just by recalling
it before following those procedures.
To store the current dial frequency/repeater state in the CALL channel memory, hold the
F/W button for ½ second to display something in the memory box, then press the CALL
BELL button.
To store a name for the CALL channel, follow the same steps for a regular memory after
pressing CALL BELL (so the procedure is done while "C" appears in the memory box).
To store a separate transmit frequency in the CALL channel, after storing the receive
frequency, tune the dial to the transmit frequency and repeat the storing procedure above, but
this time holding the PTT switch when you press the CALL BELL button.
Separate Transmit - Frequency Memories
Besides the CALL memory, all other memories can store independent receive and transmit
frequencies (however, if you are working through a repeater, you might find storing a unique
repeater offset to be simpler — see "Odd-Split Memories", above). To store a separate
transmit frequency,
O Store the receive frequency using the method already described under Simple Memory
Storage (it doesn't matter if a repeater offset is active).
O Tune to the desired transmit frequency.
O Press and hold the F/W button for ½ second to display the memory label box again.
O Press and hold the PTT switch while pressing F/W once more momentarily (this will not
key the transmitter).
Whenever you recall a separate transmit frequency memory, "- + " appear together at the top
center of the display. As with regular repeater offset operation, you can press the REV SKIP
button to display the transmit frequency, but in this case both shift symbols will blink.
After storing a memory with a separate transmit frequency, if you rewrite the receive
frequency, the separate transmit frequency is deleted.
8

Memory Tuning
While receiving on a recalled memory, you are free to change settings such as repeater shift
and offset as already described, as well as CTCSS and DTMF Paging settings, described
later. However, in the memory mode, the selector knob and microphone buttons normally
just select from among the stored memories. To change the function of these controls so that
you can retune the current memory, press the MHZ PRI button momentarily. "MT” appears
to the left of the memory label in the memory box, and you can tune in the same ways as
described before for the dial mode (including MHz steps). If you are displaying the memory
name instead of frequency, the display will change to frequency while you tune, and then
automatically back to the name after a few seconds.
You can store the new frequency and settings in the current, or another, memory. Just press
and hold F/W for ½ second, select the new memory (if desired), and press F/W again
momentarily. Operation remains on the (new) memory as the old memory reverts to its
original state.
Note
Names stored in memories always stay with the memory number - they are not copied or
overwritten when storing a retuned mem- I ory into another memory.
After retuning a memory, if you don't want to save your changes, just press D/MR once to
return to the original memory data, or twice if you want to leave the memories and return to
the dial mode.
Hiding and Erasing Memories
As already mentioned, storing data in a memory automatically overwrites previously stored
data (except the memory name). However, if you regularly move from one area to another,
you may not always want to use the same memories. With the FT-2400H, you can select and
alter which memories are available during memory selection and scanning without having to
rewrite them from scratch. This is done by masking certain memories so that they are hidden
from operation, and unmasking them only when desired.
To mask a memory,
O Recall the memory to be masked.
O Press the F/W button for ½ second (until the second beep and the memory label blinks).
If you were displaying the memory name, it will revert to frequency at this point.
O Press the REV SKIP button. This causes the display to change to the next lower stored
memory, and the previously selected memory to be no longer selectable manually, or by
scanning (described later).
To unmask a hidden memory for operation,
O Recall any memory.
O Press and hold the F/W button for ½ second.
O Select the memory number to be restored.
O Press the REV SKIP button (not F/W !!!!!).
When you have hidden some memories, be careful not to overwrite them accidentally. If you
do, you will loose all previous contents except the name.
Scanning
Before you start scanning, make sure the SQL control is set to squelch off the noise on a
clear channel. You start and stop scanning with the DWN and UP buttons on the
microphone. Just press and hold the button for more than ½ second to start scanning. If the
transceiver is in the dial mode, band scanning will result. Otherwise, if a memory label is
displayed, only the memories will be scanned.
The scanner pauses when a signal opens the squelch, and the decimal point on the display
blinks. You can also stop the scanner manually by pressing D/MR.
Memory Skip Scanning
When you have some very active channels stored in memories you may wish to skip them
when scanning, but still have them available for manual selection. You can mark a memory
to be skipped by pressing F/W —»REV SKIP while receiving on the memory. "SKIP"
appears in tiny letters just to the right of the memory number box to show that this memory
will be skipped during scanning (although you can still recall it manually). Once set, the scan
skip state remains with the memory until it is specifically cancelled.
To to this and re-enable the memory for scanning, just repeat the steps you took to disable it:
select the memory manually, and press F/W —»REV SKIP.
Scan Resume Mode Selection
You have a choice of two scan-resume modes: either Pause mode, in which the scanner
pauses for as long as the carrier keeps the squelch open; or the 5-second mode, in which the
scanner pauses for five seconds and then resumes scanning whether the signal is still present
or not. The 5-second mode is the factory default.
To change the scan-resume mode (when not scanning), press F/W -» A/N STEP. A "P" or
"5" in the memory box indicates the current mode. If you want to change it, press F/W
momentarily. Press A/N STEP again to return to the frequency display when the scan-resume
mode is set the way you want it.
Programmable Subband Limits
Besides band and memory scanning, the FT-2400H can be set to tune or scan only the fre-
quencies between two frequency limits of your choice (with the selected channel steps).
Briefly, the procedure is to store the limits in the special memories labelled L (lower) and U
(upper), and then with either memory recalled, press the MHZ PRI button momentarily.
As described previously in Memory Timing, "MT" appears in the memory box (but this time
it is blinking), and you can tune the memory, al though the frequencies stored in memories L
and U now limit the tuning and scanning range to the resulting subband. If the either AKS or
manual repeater shift is activated, repeater offset is applied automatically when you transmit
(even if the resulting transmit frequency is outside the subband limits). If you store an odd
repeater offset (this is, one different from the dial mode's repeater offset) in one of the limits,
the odd offset will be applied.
Note: The frequency resolution of subband limits is 100 kHz, although the channel resolution
9

of memories L and U is the selected channel step size. Therefore the frequencies stored in
both memories /. and U are rounded down to the nearest 100 kHz to determine the actual
sub-band limits. Since they are not limited to a specific frequency, you can still use the L and
U memories for other purposes on any frequency within the 100-kHz range above the
intended subband limit.
Example: To limit reception to 146.0 ~ 148.0 MHz (only applicable to certain transceiver
versions)
O Tune the dial to any channel between 146.000 and 146.095 MHz.
O Hold the F/W button for Va-second, tune the selector knob so that L appears in the mem-
ory box, and then press F/W again momentarily. The displayed frequency is now stored to
provide an effective lower subband limit of 146.000 MHz.
O Tune the dial to any channel between 148.000 and 148.095 MHz.
O Repeat the second step, selecting U in the memory box. This stores the effective upper
subband limit of 148.000 MHz.
O Press D / MR, to change to memory operation.
O Press the MHZ PRI button momentarily to activate the 146.000 ~ 148.000 subband limits
for tuning and scanning.
To cancel your subband limits and return to memory operation, press D /MR (if you are
scanning, or want to return to dial operation, you must press it twice). Pressing the CALL
BELL button also cancels subband limits as operation switches to the CALL channel.
Once you have stored the L and U memories, you can reactivate the subband just by recall-
ing either memory and pressing MHZ PRI. However, you cannot activate the subband when
the L or U memories are marked for skip-scanning (you'll get ordinary memory tuning), or if
either of these memories are masked (hidden).
Priority Channel Monitoring
Priority monitoring provides automatic checking for activity on a priority channel (memory)
every five seconds while operating on the dial or other memories. When the receiver detects
a signal on the priority channel, operation automatically shifts to that memory while the
signal is present (plus a few seconds). If you transmit while paused on the priority channel,
priority monitoring ceases and operation stays on the priority memory.
To set up for priority monitoring:
O Preset the squelch, and store the frequency to be monitored in a memory (this must be
memory 1 if you will be operating on other memories during priority monitoring).
O Press D/MR to operate in the dial mode, or else select the memory you want to operate
on, and then press
F/W -» MHZ PRI.
A "P" appears in the memory box, and about every five seconds the displayed frequency
shifts to the priority memory briefly while the receiver checks for a signal.
While no signal appears on the priority channel to open the squelch, you can tune, transmit
and receive on the dial, or select and operate on other memories (but not scan them). If a
station you wish to talk with appears on the priority memory, press the PIT switch
momentarily while receiving their signal, to stop priority checking. Otherwise, when a signal
appears on the priority memory, priority checking will pause and the decimal on the display
will blink. Priority monitoring will resume according to how you set the scan-resume mode -
either after a 5-second pause, or after the carrier drops (see page 22). To cancel priority
monitoring manually, press D / MR.
Note that you can use any other memory as a priority channel in the above procedure when
you are going to be operating in dial mode. You cannot, however, switch from memory to
dial operation or vice-versa without first cancelling priority monitoring (pressing D/MR
cancels priority monitoring). You also cannot scan during priority monitoring.
CTCSS Operation
The built-in tone encoder function can be used to access repeaters and stations that require a
CTCSS (subaudible) tone, by sending a tone whenever you transmit. Also, if you have the
FTS-17A CTCSS Decoder Unit option installed, you can silently monitor for calls on busy
channels. The encode function superimposes a subaudible tone (at a frequency too low to be
heard) on the transmitted carrier. The optional (FTS-17A) decode function monitors receiver
audio through a narrow filter at the same subaudible frequency, keeping the squelch closed
until you receive a matching tone. Installation of Options at the back of this manual describes
installation of the FTS-17A.
To check or set the CTCSS tone frequency, press F/W —> TONE to display the tone fre-
quency in Hz. To change the tone frequency, rotate the selector knob or press the
microphone OWN and UP buttons until the display shows the tone frequency you require
(from the choices in the table at the right). Press TONE to return to the operat ing frequency
display after checking or selecting the tone frequency.
To activate CTCSS operation just press TONE when the operating frequency is displayed.
UENC" (encode) appears at the top of the display and the tone generator is activated for
transmission. If you press TONE again without the FTS-17A option, the encoder turns off. If
the FTS-17A is installed, both UENC" and "DEC" (decode) are displayed together as tone
squelch is activated for both transmission and reception (requiring a matching tone frequency
to open the squelch). Pressing TONE once more disables tone squelch.
You can store different CTCSS tones (and encode/decode states) in each memory in the
same manner (and at the same time) as storing operating frequencies. Later, to change the
tone or state stored in a memory, just recall it, reset the tone frequency or function, and store
the memory again.
FTS-17ATone Frequencies (Hz)
67.0 100.0 141.3 203.5
71.9 103.5 146.2 210.7
74.4 107.2 151.4 218.1
77.0 110.9 156.7 225.7
79.7 114.8 162.2 233.6
82.5 118.8 167.9 241.8
85.4 123.0 173.8 250.3
88.5 127.3 179.9
91.5 131.8 186.2
94.8 136.5 192.8
10

“CTCSS Bell" Paging with the FTS-17A
CTCSS Bell operation is very similar to the CTCSS encode/decode operation just described,
in that subaudible tones open the squelch. However, if you are waiting for a call, it is
sometimes convenient to have the transceiver "ring" to get your attention. The CTCSS Bell
mode displays a small bell above the 10's-of-MHz frequency digit on the display (or to the
left of the name, if displaying a memory by name). When you receive a matching CTCSS
call, the small bell on the display blinks to indicate you received a call, and the transceiver
rings like a telephone if you have the ringer enabled (see box below). To activate the CTCSS
Bell:
O Tune to the desired frequency or memory.
O Select a CTCSS tone frequency using the F/W and TONE buttons as described on the
previous page, if you have not already.
Ringer Alerting Tone
You can control the way the transceiver rings when either a selective call (CTCSS Bell, or
DTMF Page) is received. You can set the ringer to sound differently for each of these modes.
To check or change the state of the ringer, press and hold F/W for V^-second, then press £D
/ MRg. The number in the center of the display indicates the length of each ring, and can be
set to 0, 1, 3, 5 or 8 (ringing tone pairs) with the selector knob or mic buttons (0 = no
ringing).
The display also shows either "P" (for DTMF pager) or "b" (for CTCSS Bell) in the memory
box, indicating to which response mode the displayed ringer length setting applies. Press ""j
to display and allow changing the other mode's ringer setting.
There may also be a letter "S" displayed just above the VOL control. If present, the ringer is
set to ring only once (single ring) when a call is received. If it is not displayed, the ringer will
sound when a call is received, and every 2 minutes thereafter until reset by the PTT, or
corresponding tone button. Press theF/W button to toggle between single and multiple
ringing.
When you expect to receive calls from stations using tone squelch (decoding, or CTCSS Bell
at their end), activate tone squelch encode/decode operation as described above, so they will
not miss your signal when you turn off the CTCSS Bell later to reply.
Press F/W -» CALL BELL to activate CTCSS Bell paging (the small bell icon will appear).
As with CTCSS decoding, all calls without a matching CTCSS tone will be ignored by your
receiver, but those with the matching tone will cause the transceiver to ring and the squelch
to open while the caller transmits. The bell icon begins to blink, and continues until you
manually reset it (by pressing the PTT switch to transmit, retuning, or pressing D/MR). Note
that the other station does not need to be using the CTCSS Bell function to call you: they can
use normal CTCSS encode-only (or encode/decode) functions of their transceiver.
When you receive a call, if you have the ringer enabled, you will need to disable the CTCSS
Bell feature to prevent ringing every time the other station transmits: press F/W — > CALL
BELL to turn it off.
The CTCSS Bell system is not memory-specific: turning it on or off affects the dial and all
memories.
Note: If you activate the Bell without having an FTS-17A installed, it will ring every time
the squelch opens.
DTMF Paging & Code Squelch (with the FRC-6 Option)
The FRC-6 option includes a DTMF tone encoder/decoder and a dedicated microprocessor
providing paging and selective calling features under DTMF control. The paging and code
squelch systems use 3-digit numeric codes (000 ~ 999), transmitted as DTMF (Dual-Tone,
Multi-Frequency) tone pairs. The FRC-6 has eight Code Memories in which to store 3-digit
DTMF paging codes.
The primary function of the DTMF signalling system allows your receiver to remain silent
until it receives one of the stored 3-digit codes. Then the squelch opens so the caller is heard,
and in the paging mode, the transceiver also rings like a telephone (if desired - see the box on
the previous page). When you close the PTT to transmit, the same three prestored DTMF
code digits are sent automatically. In the paging mode, three more DTMF digits are also sent,
representing your personal station identification.
The DTMF paging and code squelch systems are selected by the PAGE CODE button. Either
"PAGE" or
"CODE" appears at the top of the display when DTMF paging or code squelch is activated,
respectively.
DTMF Code Squelch
The code squelch mode is very simple. Both you and the other station communicate using
the same 3-digit DTMF sequence, sent automatically by the FT-2400H at the start of every
transmission. Your receiver normally remains silent to all signals that are not prefixed by
your selected 3-digit code. After you receive the tones, your squelch opens and stays open
during their transmission.
To use the code squelch mode, you must first store and then manually select the one Code
Memory holding the 3-digit DTMF code required to open both your squelch and that of the
other station (as described on the following pages). Also, in the code squelch mode, Code
Memories 1-7 always function the same — the distinctions and special settings described
below for the paging mode do not apply.
In either code squelch or paging modes, any DTMF-equipped station can call you (they can
use a DTMF keypad to send the three digits if you are in code squelch mode, or six digits if
you are in paging mode).
DTMF Paging
In the DTMF paging mode, you can receive signals that are prefixed with any of up to seven
different pre-stored 3-digit codes, according to the way you program the Code Memories.
When you receive a paging call, the selected Code Memory changes automatically, and the
display responds by displaying a Code Memory number (blinking) in the memory box, and
with the 3-digit DTMF code of the caller in place of the frequency display. The meaning of
the Code Memory number and 3-digit code displayed depends on how you stored the paging
code:
Individual Codes
These are personal ID codes to identify each station uniquely. You store one of these for
11

your ID, in Code Memory 1. You can store up to six other Individual Codes of stations you
call often, in Code Memories 2 - 7. When someone else transmits your Individual Code your
display shows Code Memory "0" blinking in the memory box, with the other station's
Individual Code appearing in place of the operating frequency, so you can see who called.
Group Codes
This type of code identifies a group of stations. You would generally share a Group Code
with other club members or friends. When you receive a call with a Group Code the Code
Memory number (2 ~ 7) in which you stored that 3-digit Group Code appears blinking in the
memory box, with the corresponding 3-digit Code number (in which you stored that code) to
the right.
Note that for a Group Code, the display does not show the ID and code of the caller, but
those of the group instead. Code Memories 2-7 can be used to store either Individual Codes
(for calling purposes only) or Group Codes (for both calling and receiving), as you desire.
When either an individual page directed to you, or a call to a group is received, the PAGE
indicator starts blinking, and continues until you reset it (unless you have activated the auto-
transpond feature, described in the box on page 31). This is convenient to let you know if
someone called while your attention was elsewhere. Also, the ringer sounds once, or every
two minutes, according to how you have it set (page 26).
Remember, with code squelch operation (but not with paging), you can only receive a call on
the currently-selected Code Memory, and the display does not change, nor the ringer sound,
when a call is received. So for code squelch, as mentioned before, the Individual/Group dis-
tinction does not apply (although you must still store the 3-digit Code Memories).
Storing Code Memories
The first thing to do before using the paging or code squelch systems is to store your Individ-
ual Code in Code Memory 1.
O Activate the DTMF Code Memory display by pressing F/W —> PAGE CODE. The
current Code Memory number appears blinking in the memory box, and the frequency
display is replaced by the corresponding 3-digit DTMF Code ("000", if not used before).
O Turn the selector knob to select Code Memory 1 (the Code Memory digit can be set to 0 -
7, with 0 being "read-only", and 2-7 programmable with group or other individual's IDs).
Code Memory 1 is for your personal DTMF paging ID Code.
O Press either the MHZ PRI button or the UP button on the microphone. The Code
Memory num ber will stop blinking, and the first digit of the 3-digit DTMF Code will start
blinking.
O Turn the selector knob to select a DTMF Code digit between 0 and 9, corresponding to
the first digit of the personal ID code for your station (whatever you wish to use).
O Press MHZ PRI or the microphone UP button again to cause the next digit to the right to
blink, and again turn the selector knob to select the next digit of your ID code.
O Repeat the above step to set the last digit.
At this point, if you want to go back and change one of the three code digits, you can press
the OWN button on the microphone.
Your ID code is now stored in Code Memory 1. You can press PAGE CODE to return to the
frequency display now, or you can store other code memories in the same way: press MHZ
PRI or the microphone buttons again to get the Code Memory number in the memory box
blinking, turn the selector knob, and repeat the above steps. However, before storing more
Code Memories, you will need to consider an additional feature for Code Memories 2 ~ 7,
described next.
Generally, you store another station's ID Code so you can page them, but you probably do
not want to have your transceiver ringing every time someone else calls them. On the other
hand, you store group codes with the intention of receiving any pages to the group (so you
want your squelch to open and the transceiver to ring, if paging).
During the Code Memory storage procedure described above, when storing Code Memories
2 ~ 7, you have an opportunity to decide whether your transceiver should respond to in-
coming paging calls on a particular Memory Code. At any time when a Code Memory is
displayed, you can press the F/W button to toggle DTMF squelch paging capability on and
off. When on, that is, when the decoder is enabled to receive paging calls with this Code
Memory, an underbar appears beneath the memory box.
Therefore, if you are setting a Group Code, you want to have the underbar on, and if setting
another station's Individual Code, you want it off. As already mentioned, this distinction does
not apply to code squelch only (non-paging) operation: code squelch behavior is the same,
regardless of this setting.
Note that the underbar is displayed permanently on Code Memory 1, since this is your own
ID (that you will always want to receive when paging is activated). Also, the underbar never
appears on Code Memory 0, since this is reserved for display of the ID of incoming paging
calls.
Replying to a DTMF Page, and Resetting
After setting a Code Memory, even before returning to the frequency/memory display (by
pressing PAGE CODE), you can receive DTMF Paging calls directed to you. Any DTMF-
equipped station can call you by sending your 3-digit code, followed by their 3-digit ID
Code. If you monitor with the code squelch activated ("CODE" displayed), your squelch will
open when you receive the currently-selected DTMF Code - even if it is not your ID in Code
Memory 1. If you are monitoring with the DTMF Paging feature activated ("PAGE"
displayed, blinking after a call is received), the transceiver reacts according to how you
stored your Code Memories, as described above. The paging ringing tones can be set as
described in the box on page 26, to suit your preference. For paging, you can also have your
transceiver respond automatically when you are paged, as described in the box at right.
If you press your PTT switch after receiving a call, the Code (either Individual or Group) is
transmitted automatically, and if paging is enabled, your ID Code is sent as well.
To respond to an individual call, when your display shows Code Memory 0, pressing your
PIT switch causes your transceiver to transmit your ID Code and the other station's ID Code
automatically (that is, the one displayed in Code Memory 0), and resets the blinking indi-
cator. The other station will then hear a ring from their receiver, as their squelch opens.
You will probably want to switch from paging to code squelch mode once contact is estab-
lished, or your transceiver will continue to ring every time the other station transmits. To do
this, both stations must both have the same 3-digit code selected, so at least one of you will
have to change your Code Memory selection (recall that when a DTMF paging contact is es-
12

tablished, the transceivers at both ends are set to Code Memory 0, with the other station's
unique ID displayed). If you change your Code Memory selection to Code Memory 1, it will
then match his Code Memory 0, and all he will have to do is switch from paging to code
squelch mode.
To do this, after you have exchanged initial paging calls, press PAGE CODE twice (to
change from paging to code squelch mode), then F/W —> PAGE CODE to bring up the
code setting display, and then turn the selector knob one click clockwise (to display a
blinking 1 in the memory box). If, while you were doing this, he just changed from paging to
code squelch mode, when you again transmit he should hear you, and you hear him, without
the ringing.
With Code Squelch activated in this manner, you will hear three DTMF code digits at the
start of each of his transmissions, and your set will also transmit the same three digits when
you press your PTT switch. These digits are those stored in the current Code Memory, and
they will open the squelch of both stations. Therefore, at the start of each transmission, you
must wait a second or two after pressing the PTT switch for the DTMF code to be sent and
his squelch to open before you start speaking.
When you finish your conversation, to reac tivate DTMF Code Paging, press PAGE CODE
twice so that "PAG" is again displayed.
Auto-Transpond Paging
Normally, after a page is received, the indicator blinks on the display until you transmit to
respond to the page, or press PAGE CODE or D / MR to return to the frequency/memory
display. This lets you know if a call came in while you were distracted, but it does not let the
caller know whether you received his call, or not. The auto-transpond feature addresses this
problem. When enabled, your display still changes to show Memory Code 0 and the caller's
code, and the ringer still sounds (if it is enabled), but the radio also automatically transmits
your ID Code back to the caller. Thus he can tell that you are in range, although possibly not
able to answer his page right away.
To activate auto-transpond, just press the RPT button while the DTMF Code setting display
is active. An "R" appears to the right of the displayed Memory Code when the feature is
enabled.
Note that auto-transpond is not Code Memory-specific: it is either enabled or disabled for all
paging calls (including groups).
DTMF Code Delay
When calling other stations with DTMF paging or code squelch, particularly through
repeaters, you may find some are unable to receive your calls. This can be caused by their
receiver squelch not opening fast enough (after receiving your carrier) to allow all of the
DTMF codes to be received and decoded. To correct this problem, you can set a longer delay
between the time your transmitter is activated and the time that the first DTMF digit is
transmitted.
Press F/W — > PAGE CODE, if necessary, to activate the DTMF Code setting display (the
number in the memory box blinks). Then press D / MR, to toggle the DTMF Code delay
between 250 and 750 ms (an "L" appears at the left side of the DTMF Code when the longer
delay is selected.
As with the auto-transpond feature, the DTMF Code Delay selection applies to all Paging
Codes.
In Case of Problems
Although basic operation of the FT-2400H is simple, some of the newer features may seem
somewhat complicated at first. The small number of controls belies the variety of features
that are available, and some buttons have more functions than are indicated by their labels.
So it is not difficult to get lost, at least until you have had the chance to familiarize yourself
with all of the features. This section provides some tips to help you navigate the various dis-
play and button modes.
If the display shows nothing at all, push the power switch, and check the power supply con-
nections and the fuse in the power cable pigtail. If the fuse is blown, you will need to find
out and correct the cause before replacing it. Replace the fuse only with one of the same type
and capacity: 15-A, fast-blow.
The display usually tells a lot about the current state of operation. With the FRC-6 option
installed, the display can take on many different states. Most of these are shown at the right,
together with the button to press in each case to return to the main (operating frequency) dis-
play. You will also see a (programmable) 4-letter word displayed in place of frequency when
a named memory is displayed. Pressing A/N STEP, will display the frequency. Except for
the main frequency and the memory name displays, most or all of the other buttons will be
disabled anyway.
It is well worthwhile to study the main frequency display diagram on page 6 carefully. This
display is the basis for basic operation. For example, if the frequency display changes
unexpectedly when you transmit (or if "Err" appears), check for a small" + " or "—" at the
top center, indicating that repeater shift is active, but that the resulting transmit frequency is
out of range.
If the main frequency or memory name display is visible, but pressing a button appears to do
nothing, first check for "LOCK" at the top left corner of the display. If you see it, press F/W
-> LOW LOCK unlock the buttons. Otherwise, you can press the D/MR button, which will
usually terminate any partially entered commands.
If the number in the memory box is blinking, the display is showing a DTMF Memory Code.
This occurs spontaneously when a DTMF page is received. Press PAGE CODE to return the
frequency display to normal.
If you still cannot enter data, check to see if the "TX" indicator near the upper left of the
display is on, indicating that the transceiver is transmitting. Releasing the PTT switch should
return the set to receive. If still nothing happens, switch the transceiver off, and then back on.
If the display shows all segments at the same time, or shows "C-Rx" and you cannot turn the
set off, you may have inadvertently started memory cloning - press the PTT switch (the
display will change to "Err", and then hit the power switch to return to normal operation.
As a last resort, if you are unable to gain sensible control of the transceiver, reset the CPU as
described in the next section.
To avoid confusion resulting from inadvertent button presses, set the keypad lock on (press
F/W —» LOW LOCK) if you leave the transceiver unattended while it is on. Remember to
set the lock back off when you wish to enter data.
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Resetting the CPU
The FT-2400H has three levels of resetting: memory-only, all-setting soft reset, and all-set-
ting hard reset:
To reset only the memories, hold the F/W and D/MR buttons while switching the set on.
Your step,
repeater shift and other setting will be re-tuaniend, while the memories will be cleared.
To clear all setting to their factory defaults, hold D/MR and REV SKIP while turning the
transceiver on. Then turn the transceiver off and hold only D/MR while switching it back on
again. If for some reason this fails, you can perform a hard reset by removing the top cover,
and shorting across the split solder pad on the circuit board exposed on the inside of the front
panel, just behind the top left corner of the display. Then hold D/MR while switching on.
Memory Backup
Normally, a lithium battery inside the transceiver retains all settings and memories while
power is off or disconnected. If the transceiver looses its memories (but still operates prop-
erly), this battery should be replaced.
The front panel must be removed to gain access to the battery, which is on the inside of the
front panel, just behind the memory box on the display. It should be replaced only be an
Yaesu-authorized technician to ensure that it is installed properly.
Memory Cloning
All memory data stored in one transceiver can be moved to another by connecting the mi-
crophone jacks together with the optional cloning cable, available from your Yaesu dealer.
O Turn both transceivers off, and connect the mic jacks together. Press and hold the F/W
buttons while turning the power switches on. All segments of the displays will be on.
O Press the REV SKIP button on the destination transceiver (the display will show "C-Rx"
in place of frequency).
O Press the RPT button on the source transceiver. The display will show "C-Tx" while the
data is being transferred, and should then return to normal. If "Err" appears on the destination
display, turn both transceivers off and try again. If the display of the destination transceiver
remains all blank or all on, and you cannot turn the transceiver off, press the PTT switch (the
display will change to "Err", and then hit the power switch to return to normal operation. Re-
check your cable, and then try again.
O Turn both transceivers off and remove the cloning cable.
Packet Radio
Packet radio operation with the FT-2400H requires a later-model tnc with a PLL-tpe BCD
circuit, since there is no readily-accessible squelch status output from the radio to tell the tnc
when the channel is clear. Connections between the tnc and the microphone jack of the FT-
2400H can be made as indicated in the table below.
You must use an 8-pin modular telephone-type plug for the mic jack connections. Use
shielded cable for the audio lines, and keep it as short as possible to avoid RF pickup.
"radio" Jack on TNC FT-2400H Mic Jack Comment
Receiver Audio in pin 2 8 ohms, de-emphasized
PIT out pin 3 ground to transmit
Transmit Audio out pin 4 400 ohms, pre-emphasized
Ground pin 5 Audio signal ground
Internal Adjustments
Inside the top cover are several adjustments that you may wish to make to match the trans-
ceiver to your operating requirements (the top cover can be removed as described on the next
page). You can adjust the volume of the button beeper (relative to the front panel VOL
control) by the BEEP trimmer, and medium and low power output levels by the MID and
LOW trimmers if you have a VHF wattmeter. See the Caution box below.
Caution!
The other trimmers inside the front panel should not be adjusted without
the proper test equipment. Doing so could degrade performance, or even
damage the transceiver, and will void your warranty. Ask your Yaesu
dealer for help if you need any other adjustments made.
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