Yaesu FT-8500/mh-39 User manual

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FT -8500/MH-39
Dual Band FM
Paging Transceiver
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Contents
Porsonnl Computor Control Oporatlon . 55
PCC Data Protocol 56
Writing Programs 58
FTS-22 Tone Squelch Unit Installation . . 59
Menu
Programming &Custom Settings . 61
Menu Organization 61
Menu Headings 62-74
Introduction .
Specifications
Accessories & Options
Controls & Connectors
Top, Front, Rear &Side Panel Views
LCD Indications
Installation .
Installing the MH-39 Microphone
MH·39 Key Reference Tables
Basic Operation ....
Preliminary Steps
Mixed Receive Operation
User-Proqrarnmed Function Keys
Repeater Operation
Advanced Operation
Spectra-Analyzer Operation
Auto Receiver Mute
Mommy Stomon
Recalling Memories
Home Channel Memory
Split Memory Operation
Tuning Memories
Scanning
Memory Skip Scanning
Programmed Subband Tuning & Scanning
Priority Memory Monitoring
. 1
... 3
.4
.5
5-9
10
. . 11
11
15-16
19
19
22
22
23
25
25-28
28
30
30
31
31
31
33
33
34
34-35
CTCSS Operation
CTCSS Bell Paging
DTMF Code Squelch & Paging
Trigger Paging
Paging "Answer-Back"
Paging Tx Delay
Sending DTMF Messages
CustomiZing Ringer Settings
DTMF Autodialer Operation
Composing the Ringer User-Melody
APO (Auto Power Off)
Alphanumeric Character &Symbol Charts
Power-On Settings Chart
Appendix .
Packet Radio Operation
Cross-Band Repeater Operation
Transceiver Cloning
In Case of Problems
36
36
37-40
41
41
42
43
45
46
46
46
48-49
50
. 51
51
52
53
54

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Searching for station activity is easy with VFO, mern-
ory and proqrammed-Hmit (sub band) scanning and
the new Spectra-Analyzer feature. Select all memo-
ries or only those you want to be scanned. Two scan
modes are now available: Busy Scan searches for
activity then pauses, while Clear Scan looks for an
inactive channel to operate on - great for urban areas
with crowded bands. Scan speed can be set to nor-
malar slow, and when activity is found, scanning
pauses, then resume after 5-seconds, or only when
the station stops transmitting. Each band has one
priority
memory which can be monitored every few
seconds while operating from the VFO or memories.
The built-in CTCSS (Continuous Tone-Coded
Squelch System) provides 39 subaudible tones
which can be stored in each memory independently.
The
CTCSS Bell feature can be set to ring when the
tone squelch opens.
OTMF calling and paging quietly monitor until calls
to you (or only stations in groups you select) are
received. The station's 10 code is then displayed so
you know who is calling you. With answer-back paq-
ing, the FT-8500 can even acknowledge or relay
(forward)
DTMF paging calls when you are absent. A
fully configurable paging ringer beeps, plays a mel-
ody you compose, or plays back paging 10 codes in
CWI The Trigger Paging function switches from paq-
Ing to code squelch operation after receiving a page
by pressing the
PIT so you can talk immediately.
The DTMF paging ringer can be disabled, or set rc
ring 1, 3, 5 or 8times, and even cycle every minute
until you respond. With the one-touch paging feature.
selecting and displaying paging codes is simplified.
DTMF text messages up to eight characters long
car
be sent to other stations. Amessage 10 of eight
characters can also be sent and displayed with the
text. Received messages are displayed and auto-
matically stored for later retrieval. A tri-mode ringer
alerts you to calls or messages by sounding apreset
or user-programmed melody, or else have the built-in
CW monitor playback the message in Morse code!
For
autopatch operation, a 1o-mernorv, 16-digit
DTMF autodialer stores nine frequently-called nurn-
bers and one
memory reserved for a user-pro-
grammed DTMF melody ringer for playback. The
DTMF autodial memories can also be tagged with
six-character alphanumeric names.
The Tx time-out timer (TOT) limits key-down time
and the setectable-period APO (Automatic Power
Off) timer turns off the radio after a period of inactiv-
ity. A convenient rear-panel data jack is provided for
packet TNC connection. Data rate (1200/9600 BPS)
and VHF/UHF port selection can be configured via
menu programming. PCC (Personal Computer Con-
trol) and transceiver cloning is also accomplished
using this jack. Please take some time to carefuuy
review this manual thoroughly before operation.
'-'-'--.: •. ",,!~

FT-8500 Dual-Band FM Mobile Paging Transceiver
with MH-39 DTMF Microphone
Congratulations on the purchase of your Yaesu
amateur transceiver! Whether this is your first rig, or
jf Yaesu equipment is already the backbone of your
station, rest assured that your transceiver will pro-
vide many hours of operating pleasure for years to
come. Along with the philosophy that each Yaesu
transceiver should serve you well into the future.
Yaesu stands behind our products with a worldwide
network of dealers and service centers. Feel free to
contact us if you need technical advice or assistance.
The FT-8500 is a deluxe compact FM mobile trans-
ceiver for both 2-m and lO-cm amateur band opera-
tion. A few of the new features in this dual-band rig
include the following:
• DTMF Remote Control Microphone - the MH-39
permits controlling most transceiver functions from
the palm of your hand.
•Spectra-Analyzer - view station activity above and
below a selected channel: simply turn the dial to
center a signal of interest on the scope and press
the PTT to operate! You can also view activity
among programmed memory banks. Adjustable
signal width. spacing and span markers allow fine-
tuning the spectrum view as you like.
•Configurable Memory Banks - fifty general-purpose
memories are arranged into five banks on each
band, and you can transfer memory banks from one
band to the other as needed. Free unused memo-
ries and move them where they are needed! Five
special-purpose memories (including an instant-re-
call Home channel) are also available on each
band. Memories can be tagged with an 6-character
alphanumeric name and this name can be dis-
played instead of the frequency.
• Two user-programmed function keys - makes multi-
keystroke functions as simple as the push of a
button.
• DTMF and Message Paging with CW Monitor -
decodes incoming DTMF Paging codes and mes-
sages with selectable CW playback speed.
• Dual In-Band Receive (V&V and U&U) with Auto
Receiver Muting for improved cross-band opera-
tion. Receiver muting has selectable levels and
duration.
The upper LCD shows channel data and most pro-
grammable settings, you can even display the DC
supply voltage. The lower dot matrix display shows
programming menus and also double as a Spectra-
Analyzer display for viewing channel activity. The
LCD has selectable contrast and illumination levels
for maximum visibility under varying lighting.
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Specifications
General
Froquoncy ranqo:
Channol stops:
(Rx) 110-174 MHz 410-500 MHz
(Tx) 144-148 MHz 430-450 MHz
5. 10.
12.5.15.20.25 &50 kHz
Maximum deviation:
FM Noise (@ 1kHz):
Spurious emissions:
Microphone type:
1: 5 kHz
better than -40dB
>60 dB below carrier
2-kU condenser
Operating temp. range: -20 to +60: C
Case size (WHO): 140 ;< 40 x160 wlo knobs
Frequency stability: 1:10 ppm from -20 to +60:; C(VHF,
:.5 ppm from -5 to ... 50' C(UHF)
Repeater srutt: .:600 kHz .
~5 MHz (programmable)
Current consumption:
Receive: less than 1 A
Transmit
(Max.] (high)
(mid)
(low)
better than 70 dB
Specifications subject to change without notice or obligation.
Specifications guaranteed within
amateur bands only.
Receiver
Squelch Sensitivity: better than 0.13 11 V
AF Output: 2W@su for 5% THO
AF Output Impedance:
4-16 n (8-n internal speaker)
Image Rejection:
Circuit type: double-conversion superheterodyne
IFs: 45.05 MHz &455 kHz (VHF)
58.525 MHz &455 kHz (UHF)
12-dB SINAD Sensitivity: <0.18
~V (main)
<0.25 ~V (sub)
Selectivity (-6/-60 dB): 12/24 kHz
UHf
9.0 A
5.0 A
4.0 A
WE
11.5 A
6.0 A
4.5 A
1. 1 kg (2.4 Ib)
F3 (G3E), F2
11.7-15.9VDC
Weight (approx.):
Ermssion type:
Supply voltage:
variable reactance
Transmitter
AF output:
(high)
(mid)
(low)
Modulation system:
YJ:iE
SOW
lOW
5W
UHf
35W
lOW
5W
Frequency ranges and repeatershift vary according to transceiver
version, check with
your dealer.
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Accessories &Options
Accessories
MH-39A6J DTMF Microphone
MMB-36 Mobile Mounting Bracket
DC Power Cord w/fuse
Spare 15-A Fuse
Options
FS-10Smart Controller
YSK·8500 Separation Kit
FTS·22 Tone Squelch Unit
SP-7 External Loudspeaker
FP-800 AC Power Supply w/Loudspeaker
MMB-60 Quick-Release Mobile Bracket
AvaIlabIlity of accessories may vary. Some accessories are sup-
plied as standard per local requirements. others may be unavailable
In some teqion». Check with your local Yaesu dealer for changes to
the above list.

Controls &Connectors
Front Panel
(1) LCD (Liquid Crystal Display)
The upper half of the display consists of seg-
mented digits for frequency readout and various
icons representing enabled transceiver features.
The lower half contains a dot-matrix display for
Spectra-Analyzer viewing, menu programming and
alphanumeric name display. See the graphics on
page
'0 for descriptions of the display icons and
indications.
(2) DIAL Rotary Selector
Rotate this to tune, or select memories and other
settings, according to the function selected by the
keys. This knob duplicates some functions of the
MH-39 i;J and
8/3 keys for convenience.
(3) TX Indicator
This LED indicator glows red when transmitting.
(4) Auto Dimmer Photo Sensor
This senses ambient lighting and adjusts LCD
backlighting for optimum visibility.
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FT·8500 Front Panel
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Rear Panel
(1) ANT Jack
This Type--M- jack
(50-239) accepts an antenna
designed to provide
50-11 impedance on 2-m &
70-cm. An external duplexer is not required. Note:
European versions use a Type- "N" connector.
(2) UHF -SP- EXT Jacks
These 2-conductor, 3.5-mm mini phone jacks pro-
vide separate VHF &UHF audio output for an
optional speaker (impedance is
an). Inserting a
plug into the UHF -SP- jack disables UHF audio
from the internal speaker. Both VHF &UHF audio
is disabled when a plug is inserted in to the -SP-
EXT jack.
(3) +13.8 vee Cable Pigtail w/Fuse
This is the power supply connection for the trans
ceiver. Use the supplied DC cable to connect thls
pigtail to the car battery or other DC power suppt,
capable of at least 15 amperes (continuous duty)
Make certain that the red lead connects to the posi-
tive side of the supply.
(4) DATA Jack
This provides interface connections for packet TNC
operation, transceiver memory cloning and (with the
optional FIF-232C Interface Box) for PCC (Persona,
Computer Control) operation of the transceiver.
(4)
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MH·39 Keypad Functions
Below aro short descriptions of the various controls
and button functions on the MH-39 microphone. The
pnnt on the keyfaces or orange labels indicate their
primary function, while white labeling above or
around the button indicates an alternate function
(accessed by
pressing§)~, followed by the desired
button. Aquick reference table is also provided on
pages ,
5-16. Detailed descriptions and operation
are covered later in the Operation chapter.
MIC
Beneath this grill is the condenser microphone ele-
ment. Speak across this opening in a normal tone of
voice while pressing the PTT.
5
This activates auser-programmed function, or else
enables dual in-band receive (V&V,
~&U).
JLAJLEOs
These glow or blink to indicate an alternate function
is selected (after pressing ,§JJ) ,or which channel
(letVright) the active setting applies.
~
To adjust the receiver volume, first press this mo-
mentarily to select the left/right channel (indicated by
the
OL or RO LED), then rotate the VOL control for
acomfortable level. The squelch is adjusted in a
similar manner by first holding the button longer for
~"oz sec. k)L or RJLED blinks).
'," MIC • UR VOL
_VOUSQL
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TONE PAGE lOW ~t"/,f I'
(CD CD CD) ®
S~ __ S~ __ RPT, ~ci.v,<
0 __ 0__ Cl) ®
MONI __ l-!!ITs,_ REV ~~i
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8
Keypad
MH-39 keys have primary functions, (labeled in or-
ange and take effect when pressed directly), and
alternate functions. (labeled in white and take effect
when preceded by
@j -+ [desired key]). The 0-9, #, *.
and A-D keys generate DTMF tones during transmit.
See page
15-16 for a key function list.
~~J
Tunes channels up in 1-MHz steps, selects memo-
ries. and also enables memory tuning of a displayed
memory.
~
Tunes channels down in 1-MHz steps, selects
memories, and also temporarily toggles operating
control from one band to the other.
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Pressing this displays and saves default or selected
settings for menu programming functions.
,pJ
Enables alternate function of following key pressed
within 5 seconds (while JL or
RVblink).
(ij
Selects CTCSS encode, decode or encode &de-
code operation (ENC, DEC, ENe DEC).
em
Selects DTMF Paging, Trigger Paging, Code
Squelch, and CTCSS Bell operation.
@
Selects high, medium, or low transmitter RF output
power.
~
Activates VFO or memory channel scanning.
®
Enable/disable the receiver Spectra-Analyzer. Press
momentarily to start manual "one-shot" sweep, or
hold it to start continuous sweeping.
@)
Press to select the desired Tx offset (+/-) needed for
repeater operation.
CD
Momentarily disables receiver squelch to monitor
weak stations.
(§)
Toggles the sub receiver audio muting feature on/off.
&.>
Reverse Tx/Rx frequencies momentarily during du-
plex or repeater operation.
(Q)
Momentarily displays the programmed menu set-
tings for review, or to make changes. Holding it
longer than
Y2 second writes current channel data to
an allocated memory.

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Toggles operation between the DIAL and pro-
grammed memory channels, or selects scan skip for
selected memories.
"])-
Momentarily pressing this recalls the Home channel
for the selected band. Holding it longer activates
pnonty memory monitoring.
Selects prestared message slots for transmission
during DTMF Message operation. Also activate the
keypad backlighting for better viewing in darkness.
;d
Momentarily pressing this activates a second user-
programmed function. Holding it longer locks MH-39
buttons, PTT or the transceiver DIAL knob (various
locking schemes are menu-selectable).
Hold this to turn the transceiver on/off, or press
momentarily to toggle main/sub channel operation.
Press to activate the accessory function. In Euro-
pean versions, this keys the transmitter and sends a
,750-Hz tone burst to access repeaters requiring it.
In other transceiver versions this key is not used.
MH·39 Top Controls
B/3
Press or hold to tune up/down in the default channel
step size.
During Menu Programming, these move
from
displayed headings to available entries. With an
entry selected,
pressing dor -..:::.J moves between
available fields for
data entry.
Note! -A& I:=J keys
--.J '2..-(J
From the factory, the user-programmable function
keys are preset to the following:
5 -Reverse TxlRx frequencies momentarily during
duplex or repeater operation (replaces
mil --+ -2)).
Q - Selects high, medium, or low transmitter RF
o~put power (replaces I§)~ ~~).
These default settings can be changed by a simple
power-onkey sequence. Referto the boxon page 17,
and the explanation on page 22 for furtherdetails.
9

LCD Indications
Channel Channel
Number Repeater B k Number Repeater
Bank I Shift . an ISh Oft
Number CTCSS D!MF Pagl~g Number CTeSS IDTMF Paging
I
Encode/Decode Trigger Paging I Encode/Decode i Trigger Paging
I __ III
8
.. 00 EffClJEC -+ CODE T.PAGE t~ t~ t~ ENe DEC -+ CODE T.PAGE
L..' L'~ SKIP fmfll) II L.'''O C,~ SKIP fi'IT4ll) \
.r \ \ -------- I -.
DTMF Code I Main Channel DTMF DTMF Code Memory Main Channel DTMF
Memory Enable \ Indicator Code Squelch Memory Enable Scan Skip Indicator Code Squelch
Memory
Scan Skip
cress PT
Bell >, Loc
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Ii' 1-' ,-, 1-' , ... , .. ,c
MT .,.f•.,.f ~ • ~ ~,~,_,
\ <. ~
Memory One-Touch Scan Stop
Tune Paging
Indicator
Rx
Mute
CTCSS AM Rx
Bell, Rx Mute
.., .., .. ~ .. oocn: /
MUTE /~' /_, ,-, ,-, " ,~, -MUTE
MT ... f ... f~.~ .... 5 TOT
- -------- - I II
Memory One- Touch Scan Stop Time-Out
Tune Paging Indicator Timer
Dual UHF Rx Low IMid UHF
Enabled Tx Power
II
mm li1lI:DD.BIIIllIIB __ LM
I
Rx S-Units / Relative
Tx Power
(!)
I
APO Timer
On/Off
Dual VHF Rx Low/Mid VHF
Enabled Tx Power
II
n-II _li1lI:DD.I1_Ii1_B __ L M
KeJpad Rx s-uni1s IRelative
Lock Tx Power
10

Installation
This chapter describes installation of the FT-8500
with typical supplied accessories. Installation of the
optional FTS-22 Tone Squelch Unit should be done
before installing the transceiver and is described in
the Installation of Options chapter at the back of this
manual.
Preliminary Inspection
Inspect the transceiver thoroughly immediately upon
opening the packing carton. Confirm that all controls
and switches work freely, and inspect the case for
any damage. Make sure the accessory fuse is in-
cluded. If any damage is found. document it com-
pletely, and contact the shipping company (or dealer,
ifyou purchased it over the counter) right away. Save
the packing materials in case you need to return the
set tor service.
If you purchased the optional FTS-22 Tone Squelch
Unit. install it now as described on page 59. This
chapter describes base station installation first, fol-
lowed by mobile installation and then interconnec-
tions with external accessories.
Installing the MH-39 Microphone
From the factory, the MH-39 is packaged separately
from the transceiver body. It is installed by removing
the front panel from the transceiver, then plugging
the MH-39 cable into the transceiver body, then rein-
stalling the front panel.
CJ To remove the front panel. use your left thumb nail
to slightly pry open the latch on the left side of the
transceiver. Next, using your right hand to slide the
panel outward and away from the transceiver.
i
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oPlug the microphone cable into the recessed jack
on the transceiver, as shown in the drawing.
oBefore reinstalling the front panel, decide if you
want the control cable to exit from the side or
bottom of the transceiver, then route the cable into
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the appropriate channel provided (see drawing)
Reinstall the front panel by hinging it into place. you
will hear a click when the panel locks into place.
Antenna Considerations
Mobile Installation
The FT-8500 is designed for use with antennas ha-
ing an impedance near 50 11 at all operating frequei
cies. For optimum performance use a high qualit
carefully-designed antenna. The antenna should b
connected whenever power is on. to avoid damag
that could otherwise result if transmission occur
accidentally without an antenna.
Ensure your antenna is designed to handle 50 Watt
continuous transmitter power. For best performanc
and safety in mobile installations. mount the antenn
in the center of a flat surface, out of reach of hurna
hands: 50 Watts can cause an RF burn to anyon
touching the antenna during transmission!
For best performance use the shortest possit»
length of quality coaxial cable. Use a matching type
M plug
(80-239) for the jack on the transceiver pigta
(European versions use Type-N).
The FT-8500 must only be installed in cars having (
negative ground electrical system. The transceive
can be installed in one piece using the supplle:
MMB-36 mobile mounting bracket, or in two piece:
using the optional Y8K-8500 separation kit anr
MMB-60 quick release mounting bracket. Mount thr
transceiver where the display, controls and micro
phone are easily accessible. The transceiver may br
installed in any position, but should not be near c
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Important! Ensure the power is first switched off
before removing the front sub-panel. The transceiver
will turn off automatically after two seconds if the
front panel is removed with power applied.
12
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heater vent or where it could interfere with driving.
Make sure to provide plenty of space at the rear so
that air can flow freely through the heatsink. Refer to
the diagrams showing installation.
Transceiver Installation
CJ Decide the mounting location with sufficient clear-
ance tor the transceiver, plus space for ventilation
around the cooling tan and above and below the
set. Use the mounting bracket as a template to
locate tno mounting holes. Use a 4.8-mm (3/16")
bit to drill the holes. and secure the bracket with the
supplied screws. washers and nuts (see diagram).
oPosition the transceiver in the bracket so that the
holes in the side are aligned with those in the
bracket, and bolt the transceiver into place using
the' supplied short screws and flat washers. The
MH-39 hanger may be installed wherever conven-
ient.
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14
Mobile Power Connections
To minimize voltage drop and avoid blowing the car
fuses, connect the supplied DC cable directly to the
battery terminals. Do not attempt to defeat or bypass
the fuse -it is there to protect you and the equip-
ment!
Warning!
Never apply AC power to the power cable of the
transceiver,
nor DC voltage greater than 15 volts.
When replacing the fuse, only use a 15-A fast-blow
type. Failure to observe these safety precautions will
void the warranty.
LJ Before connecting the transceiver, check the volt-
age at the battery terminals while revving the en-
gine. If it exceeds 15 volts, adjust the car regulator
before proceeding.
nConnect the ,RED power cable lead to the POSI-
TIVE (+) battery terminal, and the BLACK 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 only after connecting to the battery.
FP-BOO AC PowerSupply
Operation from the AC line requires a power supply
capable of providing at least 15A continuously at
13.8 VDC. The FP-800 AC power supply/loud-
speaker is available from your Yaesu 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 either speaker
jack on the rear panel.
External Speakers
The optional SP-7 External Speaker includes its own
swivel-type mounting bracket, and is available from
your Yaesu dealer. Of course the SP-3, SP-4 or
SP-55 External Speakers may also be used. Plug-
ging in an external speaker disables the speaker in
the transceiver.
.... 4 ....,j

~ Enter digit 5 IDTMF 5
...---_.-
I
.ID Enter digit 6 IDTMF 6
Keypad direct-access
mode.
Keypad ail-function
direct-access mode.
Press button &Power On
Activate cross-band repeat. :
PMS
Hold >0.5 sec.
Activates continuous
spectra analyzer sweep.
MH-39 Keypad Button Functions
Alternate Function
(after pressing ,§JrI )
Activates VFO or memory
channel scanning.
Toggles high, mid, or low
Tx output power.
Toggles CTCSS encode, !
decode,encode&decode
on/off.
Selects Paging, Trigger
Paging, Cooe Squelch, or
CTCSS Bell.
Activates
smgle-sweep
Ispectra analyzer.
ISelects repeater shift (Tx
Ioffset) direction: + / - I
:. simplex.
Normal Function
(RxfTx)
Enter digit 3IDTMF 3
Enter digit 2 / DTMF 2
Enter digit 1 / DTMF 1
Enter digit 4 IDTMF 4
Button
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Enter digit 7 IDTMF 7 IMomentarily disables
receiver squelch.
,
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-.--_. ----_. __ ..... _---_. __ ._---_. --_.~-
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Enter dIgit 9 / DTMF 9 IReverses Tx &Ax
frequencies.
-._-~-----
:ID
Enter digit 0 / DTMF 0Recalls menu iOne-touch
memory write. Direct Menu-Access
programming routine. IMode.
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Toggle DIAL &MR mode IMemory channel scan- Memory Bank transfer
DTMF *.
skip on/off. mode. ..
~
Transfers operation to the Priority channel monitoring
Home channeUDTMF II. 15

16
MH-39 Keypad Button Functions
-_., .. _.~_.
j
Button
j
Normal Function
Alternate Function
Hold >0.5 sec. Press
button & Power On
(RxfTx) (after pressingp;1J )i
!
ITune up in 1 MHz steps / Enables Memory Tuning I
~.
IOTMF A. of the displayed memory. iI
!I
--.
III
iTemporarily transfers
r!' iTune down In 1 MHz steps / main control to the other I
IOTMF B. i
Iband Ii
~
IMenu setting selection / IN/A (no function).
I
OTMFC
!i
pJ
IActivate alternate function iN/A (no function). I!Transceiver Clone Mode.
Iof following key / OTMF 0I!
II!
!Activates user-programmed !Locks the microphone I
~
;iP2 key user-set mode".
!function #2. icontrols and buttons. I
~
IRecall received message iTurns keypad lamp on/ott.
bank for display &checking. ;I
I
-_.. _-
I
IToggles main and sub i
i;) IN/A (no function). Turns radio on loff.
Ichannel operation. I
I
>--- •
11 Acnvates user-programmed IEnables dual in-band jP1 key user-set mode".
-J
tunction #1. ireceive
(V&V, U&U).
Select UR channel for Ii
~
volume control. NlA (no function). Squelch set for UR channel.
~
Jumper-selectable function". 1Same as normal function. Same as normal function.
"Note· for more information on applications anc~ programming of 5and g, see the box on the next page, and also on page 22.

NOTE-User-Programmed Keys
All transceiver functions and settings are acces-
sible via keypad sequences from the MH-39. As
explained earlier and shown in the tables on the
preceding pages, most buttons have multiple
functions, depending on the duration they are
held depressed (less or more than
Y2 sec.), or if
they are preceded by
,Q)~ ~ (to enable their alter-
nate function).
Two special keys,
~ jand :~, can each be as-
signed a function (Ofihe users selection) to sim-
plify operation. This is especially convenient for
functions that require two-keystroke activation,
as they can now be accessed with a single push
of a button. Examples are: scanning, power out-
put, spectra analyzer - any of the ivory-labeled
functions on the keypad.
The box on page 22 gives provides an explana-
tion on programming
.~ and g, and performs
two examples of usefurfunction assignments to
these keys.
17

18