Yaesu FT-757GX Operating Manual page 14

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COMP LEVEL
This potentiometer sets the compression level of
the audio speech compressor during S SB trans­
mission with the processor on. The adj ustment
procedure is described in the Operation section of
this manual.
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AM CAR
This potentiometer sets the level of the trans­
mitted carrier and modulation during AM trans­
mission. See the operation section for the adjust­
ment procedure .
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MARKER Push Button Switch
Press this switch to activate the 25 kHz marker
signal generator, which will produce a crystal-con­
trolled calibration signal at every 25 kHz through­
out the tuning range of the transceiver. When not
needed, this switch should be in the off (out)
position. If this switch is pressed when the LINEAR
switch is also pressed, the memory backup circuit
will be disabled and all memories will be cleared
if power is disconnected.
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REMOTE
This 3-pin molex connector provides access to the
serial microcomputer data lines of the CAT system,
for control of the transceiver f r om an external
microcomputer t)1rou � h an optional interface unit.
(FIF-6 5 , FIF-232C etc.)
F I F-65
Mic rocompu ter I n terface U n i ts
(jJ)
PTT
This RCA jack offers access to the PTT line, for
e xternal receive/transmit switching by a foot­
switch or other device. Connecting the inner con­
tact to the outer contact or ground activates the
transmitter. Also, when the FT-7 5 7GX is used
with a linear amplifier, this j ack provides the PTT
switching signal for the F RB-7 5 7 Relay Box to
control the linear. Do not connect your amplifier
relay control line directly to this j ack.
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ANT
This type M (S0-239) jack is for connection of a
5 0-ohm unbalanced load, such as an antenna
resonant at the operating frequency, an antenna
tuner, or linear amplifier input. Use only a type M
(PL-25 9) plug to make connection.
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PATCH/AFSK
This RCA jack accepts input from a phone patch
or AFSK tone generator, for application to the
transmitter audio amplifier.
ohms, and the level is adjustable by the MIC gain
control when the transceiver is set to an S S B mode.
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FWD- REV Slide Switch
During transmission, when the front panel METER
switch is in the (depressed) PO position, this switch
provides for selection of either relative forward
or reverse power output indication on the meter.
The adjacent FWD SET control adjusts the relative
amount of deflection, and can be used in conjunc­
tion with this switch to provide display of SWR on
the meter, as described in the Operation section of
this manual.
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FWD SET
This potentiometer adj usts the sensitivity of the
Meter during transmission, when the front panel
METER switch is set to the PO position. Use this
control in conj unction
switch to set the Meter for full-scale deflection in
the FWD position, so that SWR can be read f r om
the Meter in the REV position.
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EXTALC
This RCA jack accepts automatic level control for
the transmitter from an external linear amplifier.
The range of this voltage should be between 0 and
-5 VDC, referenced to the outer contact (ground).
- 1 2
Impedance is 600
with the FWD-REV