Yaesu FT-712RH User manual

OPERATING
MANUAL
FT-712RH
Y
AESU MUSEN CO.,
LTD. C.P.O. BOX 1500
TOKYO, JAPAN

CONTENTS
SUPPLIED ACCESSORIES . . 2Memor
y
Stora
g
e21
Memory Recall 22
OPTIONS . . . . . . . . . . 2 Hiding/Erasing Memories 22
Call Channel Memory 23
SPECIFICATIONS . . . . . . 3Scanning 23
Memory Skip Scanning 24
CONTROLS & CONNECTORS 4 Programmable Memory
FRONT PANEL 4 Scanning (PMS) 24
REAR PANEL 7 Priority Monitoring 25
Tone Squelch Operation 26
INSTALLATION . . . . . . . 8
Antenna Considerations 8 DVS-1 DIGITAL VOICE
Mobile Installation 8 SYSTEM . . . . . . . . 27
Mobile Power Connections 10 Voice System Display 28
External Accessories 11 Segmentation Codes 30
Base Station Installation 12 Recording 30
Packet TNC Interconnections 12 On-The-Air Recording &
DVS-1 Digital Voice System Playback 32
Installation 13 Remote Station Recording
FTS-12 Tone Squelch Unit & Playback 32
Installation 15 Locking Segments 34
Memory Cloning 16 Private Station ID Code 35
Modification for Packet Radio 17
CAT System External Compu-
ter Control . . . . . . . 37
OPERATION . . . . . . . . 18
Preliminary Operating Infor
mation 18 In Case of Problems . . . . . 40
Squelch Setup 18
Frequency/Step Selection 19
Transmitting 20
Re
p
eater S
p
lits 20

YAESU FT-712RH COMPACT 70cm FM MOBILE
TRANSCEIVER
The FT-712RH is a compact, full-featured frequency synthesized FM mobile/base
transceiver providing selectable power output of either 3 or 35 watts on the 70cm
amateur band. Unique features include the optional DVS-1 Digital Voice System,
which provides local and remote digital voice recording and playback when
installed in the FT-712RH.
Inside the FT-712RH, surface-mount components provide high reliability and
performance, while modular circuit construction makes servicing easy. An all-
new compartmentalized die-cast chassis provides superb rf isolation and
incredible overall ruggedness. A large liquid crystal display includes a bargraph
PO/S-meter. Ambient light is sensed to automatically control the brightness of
the display back-lighting and pilot lamps, dimming the display in dark
environments.
Operating features include memory selection and tuning in 5, 10, 12.5, 15, 20 and
25 kHz selectable steps; The channel memory system includes 19 general purpose
memories, a one-touch recall CALL channel memory and two subband limit
memories (for programmable subband scanning); one-touch repeater reverse;
band and selected memory scanning with auto-resume after carrier-drop or 5-
second pause, and priority channel monitoring. Memory hiding and scan-skip are
easily settable.
Twenty of the memories store either programmable repeater shift or independent
transmit and receive frequencies. When the optional FTS-12 Tone Squelch unit is
installed, any of 37 standard CTCSS (subaudible) tone frequencies can be
displayed, selected and programmed into any memory channel for either silent
monitoring or encode-only operation.
The microphone jack includes signals for CAT System control from an external
personal computer, and memory cloning to/from other FT-712RHs. A 1750 Hz
burst tone generator is built-in and can be activated from the MH-14A8
Speaker/Mic. DTMF keypad microphone options include the MH-15C8 and the
MH-15D8 with its own auto-dial DTMF memories. If the burst tone is not
needed, an internal jumper can be set to allow packet radio tnc interfacing via the
microphone jack.
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Along with one microphone, the MMB-37 Reversible Mobile Bracket is supplied
with the transceiver. For base station installations, the FP-700 AC Power
Supply/External Speaker is optionally available.
Please read this manual before installing or operating the FT-712RH.
SUPPLIED ACCESSORIES
MMB-37 Mobile Mounting Bracket 136000056
Power Supply Cable T9015615 with two 15A fuses, 2.8m One of the
microphones listed below.
OPTIONS
Model Order Code
DVS-1 Digital Voice Memory Unit 133000567
FTS-12 Tone Squelch Unit 133000488
SP-55 External Speaker
MH-14A8 Hand Speaker/Mic w/Burst Button 131000051
MH-14B8 Hand Speaker/Mic 131000052
MH-14138 Standard Hand Mic 131000067
MH-15C8 Hand Speaker/Mic w/DTMF keypad 131000060
MH-15138 Hand Mic w/DTMF Autodialler Memory 131000061
MF-1A3B Boom Microphone with flexible arm
YH-1 Headset (w/microphone)
SB-10 PTT Switch Unit for MF-1A3B or YH-l
MODEL CHART
Version Fre
q
. ran
g
e
(
MHz
)
R tr. Shifter*
(
MHz
)
A 430 - 450 ±5
B 430 - 440 ±7.6**
C 430 - 440 ±1.6**
X430 - 440 ±5
* Default - freely programmable by operator
** Burst tone activated by MH-14A8 Microphone.
-2-

SPECIFICATINS
GENERAL RECEIVER
Frequency range: Circuit type:
see Model Chart Double-conversion superhet
Channel steps Intermediate frequencies:
5/10/12.5/20/25 kHz 45 MHz & 455 kHz
Standard repeater shift: Sensitivity (for 12dB SINAD):
see Model Chart better than 0.18uV
Mode of emission: Image ratio:
G3E better than 65dB
Antenna impedance: Selectivity (-6/-60dB)
50 ohms, unbalanced 12/30 kHz
Supply voltage: Audio Output (for 5% THD):
13.8 VDC ±10%, neg. Ground at least 1.5W into 8 ohms
Supply current:
Transmit 35W: 10A TRANSMITTER
Receive: 500mA
Standby: 300mA RF output power (50 ohms):
3 watts and 35 watts
Operating temp. range:
-20 to +60 °C Modulation method:
Variable reactance
Frequency accuracy:
±5ppm (-5° to +50°C) Maximum deviation:
±5 kHz
Case size (WHD):
140 x 40 x 160mm Spurious emissions:
at least 60 dB below carrier
Weight:
Approx. 1.25 kg Microphone impedance:
2 kilohms
Specification subject to change without notice.
-3-

CONTROLS & CONNECTORS
FRONT PANEL
(1) Selector Knob
This 24-position detented rotary switch is used for tuning as well as a wide variety
of function selections. The DWN and UP keys on the microphone duplicate the
functions of this knob.
(2) Push Button Switches
These push buttons select the various operating features. One or more beeps will
sound if the resulting command is accepted (beep notes are shown on page 33). The
white labels above or to the right of the buttons indicate their primary functions,
while the blue labels below the buttons indicate alternate functions, activated by
pressing the F/WRITE button momentarily first, and then the other button within
five seconds.
For descriptive purposes in this manual, alternate button functions are referenced
by the blue label, with "[F]+" in front of it to remind you to press F/WRITE first.
For example, "[F)+BEEP" indicates that you should press the F/WRITE button
followed by the VOICE/BEEP button (within five seconds). All button functions
are described in detail in the "Operation" section, and summarized in the
Operator's Quick Reference Charts.
- 4 -

(3) Auto Dimmer Sensor
Behind the glass is a photosensor which detects the level of ambient light,
causing the display lamps to be automatically dimmed in the dark.
(4) VOL Control
This control adjust the volume of the receiver audio.
(5) SQL Control
This control sets the threshold level at which received signals (or noise) open the
squelch. For maximum squelch sensitivity set this control from counterclockwise
just to the point where noise is silenced (and the BUSY indicator on the display
is off) when the channel is clear.
(6) MIC Jack
This 8-pin jack accepts microphone input and scanning control from the
microphone and/or control signals from an external computer. Memory cloning
can be performed with another transceiver through this jack, and an internal
modification also allows packet radio tnc connection here. Pinout is shown on
the next page.
(7) POWER Switch
This two-position push button turns the transceiver on and off.
(8) LOW/LOCK Button
Normally, this button toggles between high and low transmitter power output.
When low power is selected, two low-pitched beeps sound, and "LOW" appears
at the lower right corner of the display. Two highpitched beeps sound when high
power is selected.
If the F/WRITE button is pressed just before pressing the LOW/LOCK button,
transmitter power is not changed, but rather low/high beeps sound, and "LOCK"
appears in reverse letters at the lower left corner of the display, indicating that
the selector knob and all other
- 5 -

buttons are now disabled. Pressing [F]+LOCK again sounds high/low beeps as
the lock condition is released.
(9) Display
The display segments are follows. The meaning of each is described elsewhere in
this manual
MIC Jack Pinout
- 6 -

REAR PANEL
(1) 13.8VDC Cable Pigtail
This is the power supply connection for the transceiver. Use the fused DC Cable
supplied with the transceiver to make connection between this pigtail and the car
battery or other DC power supply capable of at least 10 Amperes (continuous). Make
certain that the red lead connects to the positive side of the supply.
(2) EXT SP (External Speaker) Jack
This 2-contact mini phone jack accepts a 4- to 16-ohm external speaker such as the
Yaesu SP-3, SP-4 or SP-55. When a plug is inserted into this jack the internal
speaker is disabled.
(3) ANT (Antenna) Jack
Connect a 70cm antenna to this type-N socket using 50-ohm coaxial cable and a
type-N plug. Make sure the antenna is designed specifically for use at the operating
frequency.
-7-

INSTALLATION
Antenna Considerations
The FT-712RH is designed for use with an antenna having an impedance near 50
ohms at the operating frequency. For optimum performance use a high-quality,
carefully designed antenna. The antenna should be connected at all times when
power is on, to avoid damage that can otherwise result if transmission occurs
accidentally when no antenna is connected.
Another important consideration is the feedline. For optimum performance use
the shortest possible length of the best quality coaxial cable available, and be
sure to use a properly matching plug (type-N) for the jack on the transceiver.
Mobile Installation
The FT-712RH must only be installed in cars having a negative ground electrical
system. The transceiver should be located where the display, controls and
microphone are easily accessible, and should be securely affixed using the
supplied MMB-37 mobile mounting bracket. The transceiver may be installed in
any position without adversely affecting its performance, but it should not be
mounted near a heater vent or where it could interfere with safe operation of the
vehicle. Make sure that plenty of space is provided at the rear of the transceiver
so that air can flow freely around the heatsink. Refer to the diagrams on the
facing page for installation of the MMB-37.
(1) Using the mounting bracket as a template, locate the mounting holes after
determining the mounting location with sufficient clearance for the
transceiver. Use a 4.8mm (3/16") bit to drill the holes. Secure the bracket
with the supplied screws, washers and nuts (Figure 1).
(2) Screw the two mounting clips to the sides of the transceiver using the small
hex bolts and washers supplied (Figure 2).
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