Yaesu FT-757GX Technical Supplement page 17

ALIGN MENT
LOCAL Unit
A. Third LO BPF
Remove P1 7 and connect a 50-ohm load across 3rd
LO OUT jack J 2008, along with the RF voltmeter.
Set the transceiver to a CW mode, and while
receiving, adjust T 200 1 and T 2002 for maximum
deflection on the voltmeter (50 m Vrms nominal).
AM ,
B. SSB, CW RX LO Level
Connect the RF voltmeter to pin 2 of 020 1 2 and
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adjust TC20 2 so that the difference in level be­
tween CW transmit and receive is less than 5 m Vrms
at this point (output level approximately 100
mVrms).
C. 45 MHz Bandpass Filter
With the transceiver set to the 14 MHz band,
connect the RF voltmeter to T P 2006 and adjust
T 2009 and T 20 1 0 for maximum voltmeter deflec­
tion (more than 80 m Vrms).
D. 60 MHz Bandpass Filter
Set the transceiver to the 21 MHz band, and with
the RF voltmeter connected as in the previous step,
adjust T 20 1 1 and T 20 1 2 for maximum deflection
(more than 80 mVrms ).
E. 45 MHz Tripler
Return the transceiver to the 14 MHz band, and
connect the RF voltmeter to TP2002 . Adjust T 2006
and T 2007 for maximum deflection (more than
80 mVrms).
F. 15 M Hz Reference Frequency
Connect the frequency counter to T P 2002 and
adjust TC2006 for 45 MHz ±20 Hz.
G. 2nd Local Oscillator Frequency
l. Connect the frequency counter to T P 2007,
and tune the transceiver so that the display
indicates 14.000.00. Adjust VR2006 so that
the counter shows 32.06000 MHz ± 20 Hz.
2. Retune the transceiver so that the display
shows 13.999.99, and adjust VR20 1 4, if
necessary, to obtain 32.05901 MHz on the
counter. Now retune the transceiver to
14.000.00 and check that the difference in
the frequencies shown on the counter are
within 990 Hz ±5 Hz.
H. Carrier Point
Connect the frequency counter to J 2008 and
adjust the component indicated in the correspond­
ing mode for the frequency shown below:
MODE ADJUST
LSB TC2 oos
cw
TC2004
USB VR2 oos
I. BFO Frequency
Set the transceiver to a CW mode, and connect the
frequency counter to pin 2 of 020 1 2.
TC200 1 while receiving for 15.000700 MHz (±1
Hz) on the counter.
J.
/
FM AM Carrier Frequency
1. Set the transceiver to the FM mode, and
connect the frequency counter to J 2007.
Adjust VR2004
8.215000 MHz (±50 Hz) on the counter.
2. Rotate the AM CAR control (VR2008) fully
clockwise, and set the transceiver to the AM
mode. Close the P TT line and check the
counter for 8.215000 MHz ±300 Hz.
K. Carrier Level
Set the transceiver to the LSB mode, and connect
the RF voltmeter to T P 200 1 . Close the P TT line
and adjust TC200 3 for 90 mVrms (±5 mV).
L. Carrier Balance
With the transceiver set to LSB, connect the RF
voltmeter to J 2007
minimum voltage on the meter.
M. AM Carrier Level
1. With the RF voltmeter connected to J 2007,
set the mode to CW, key the transmitter, and
note the voltage indicated on the meter
(approx. 200 m Vrms).
2. Return to receive, switch the mode to AM,
close the P TT line and adjust AM CAR
control VR2008 for exactly half of the voltage
noted in the previous step.
- 1 4 -
COUNTER FREOUENCY
8213.400 kHz (±50 Hz)
8 21 5. 900 kHz ( ± 1 0 Hz)
8216.600 kHz (±50 Hz)
Adjust
while transmitting
and adjust VR200 1
O
for
for