Yaesu FT-712RH Operating Manual

OPERATING

MANUAL

FT-712RH

YAESU MUSEN CO., LTD. C.P.O. BOX 1500 TOKYO, JAPAN

	CONTENTS
SUPPLIED ACCESSORIES . .	2	Memory Storage	21
OPTIONS . . . . . . . . . .		Memory Recall	22
	2	Hiding/Erasing Memories	22
SPECIFICATIONS . . . . . .		Call Channel Memory	23
	3	Scanning	23
CONTROLS & CONNECTORS		Memory Skip Scanning	24
	4	Programmable Memory
FRONT PANEL	4	Scanning (PMS)	24
REAR PANEL	7	Priority Monitoring	25
INSTALLATION . . . . . . .		Tone Squelch Operation	26
	8	DVS-1 DIGITAL VOICE
Antenna Considerations	8
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-	37
		ter Control . . . . . . .
OPERATION . . . . . . . .	18
Preliminary Operating Infor
mation	18	In Case of Problems . . . . .	40
Squelch Setup	18
Frequency/Step Selection	19
Transmitting	20
Repeater Splits	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 allnew 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	Freq. range (MHz)	R tr. Shifter* (MHz)
A	430 - 450	±5
B	430 - 440	±7.6**
C	430 - 440	±1.6**
X	430 - 440	±5

*Default - freely programmable by operator

**Burst tone activated by MH-14A8 Microphone.

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SPECIFICATINS

GENERAL

Frequency range:

see Model Chart

Channel steps

5/10/12.5/20/25 kHz

Standard repeater shift: see Model Chart

Mode of emission:

G3E

Antenna impedance:

50 ohms, unbalanced

Supply voltage:

13.8 VDC ±10%, neg. Ground

Supply current:

Transmit 35W: 10A

Receive: 500mA

Standby: 300mA

Operating temp. range:

-20 to +60 °C

Frequency accuracy:

±5ppm (-5° to +50°C)

Case size (WHD):

140 x 40 x 160mm

Weight:

Approx. 1.25 kg

RECEIVER

Circuit type:

Double-conversion superhet

Intermediate frequencies:

45 MHz & 455 kHz

Sensitivity (for 12dB SINAD):

better than 0.18uV

Image ratio:

better than 65dB

Selectivity (-6/-60dB)

12/30 kHz

Audio Output (for 5% THD):

at least 1.5W into 8 ohms

TRANSMITTER

RF output power (50 ohms): 3 watts and 35 watts

Modulation method:

Variable reactance

Maximum deviation:

±5 kHz

Spurious emissions:

at least 60 dB below carrier

Microphone impedance:

2 kilohms

Specification subject to change without notice.

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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.

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(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

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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

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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.

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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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To install the transceiver, position the transceiver in the bracket so that the clip on the left side fits into the slot in the left side of the bracket e 31, then push the right side of the transceiver upwards until it latches.

To remove the transceiver place your hand underneath it and pull the latch on the right side of the bracket outward until the right side of the transceiver drops free.

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Mobile Power Connections

Before connecting the power cable the maximum battery charging voltage should be checked to ensure that it remains below 15V when the engine is run fast. If more than 15V, the voltage regulator of the car should be adjusted before connecting the transceiver.

Power connections should be made directly to the automobile battery using the supplied cable with 15A in-line fuses. Connection to the cigarette lighter or other accessory circuit may cause the fuse to blow in that circuit. Connecting the supplied DC power cable to the battery independently of the rest of the automobile electrical system will minimize possible ignition noise pickup and excessive supply voltage drop during transmission, while allowing operation with the ignition off.

Do not connect any power to the transceiver except via the supplied fused cable, and do not attempt to defeat or bypass the fuses - they are their to protect you and the equipment.

Connect the RED lead of the power cable to the POSITIVE (+) battery

terminal, and the BLACK lead to the NEGATIVE (-) terminal. If it is necessary to extend the power cable, use #14 AWG or larger insulated, stranded copper wire, and in all cases use the minimum power cable length practicable to keep voltage drop minimal.

WARNING

NEVER APPLY AC POWER TO THE REAR PANEL POWER JACK OF THE TRANSCEIVER. NEVER CONNECT DC VOLTAGE OF MORE THAN 15 VOLTS TO THE POWER JACK. ALWAYS REPLACE FUSES WITH 15A RATING. FAILURE TO OBSERVE THESE PRECAUTIONS WILL VOID THE WARRANTY.

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External Accessories

The SP-3, SP-4 and SP-55 External Speakers are optional accessories which allow the source of audio from the transceiver to be repositioned for optimum hearing. Especially practical for the noisy mobile environment, each includes its own swivel-type mounting bracket, and is available from your Yaesu dealer. Also available to enhance safety and mobile operating convenience are the YH-I Headset with miniature boom microphone, and the full size MF-1A3B boom microphone with flexible arm (both of which use the SB-10 PTT switch).

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