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TRC-70
72
ADJUSTMENT
5-4. Zero- and eight-point checks
1. Set that the memorizing frequency is 2.100.0 MHz,
the mode is USB, and the SSG frequency is 2.101.0
MHz.
SSG level: RF OUT OFF
. Check that the voltage at the TP5 terminal of the TX-
RX unit is 0.08 to 0.15 V.
SSG level: -73 dBm (50 uV)
. Check that the LCD on the panel indicates a ''8-
point bar" indicator goes on.
Note: If the checks in steps 5-4 are incorrect, make
the adjustments outlined in steps 5-1 through 5-3
again.
. NB Adjustment
. Connect SSG to the ANT terminal.
. Connect an analog voltmeter to the TP3 terminal of
the TX-RX unit.
SSG specifications:
Frequency
2.101.0 MHz
Level
-—93 dBm (5 pV)
Set that the memorizing frequency is 2.100.0 MHz
and that the mode is USB.
. Turn the two IFTs of the TX-RX unit IC1 until the
voltage at the TP3 terminal is minimum.
(Reference level: Approx. 3.25V)
. SSG specifications:
Frequency
2.101.0 MHz
Level
RF OUT OFF
Check that the voltage at the TP3 termina! of the TX-
RX unit increases approximately 5.45 V.
. Squelch Adjustment
. Set that the receiving frequency is free and that the
mode is USB.
. Turn VR5 of the TX-RX unit counterclockwise as far
as it will go. (Preset)
ANT
is
|
ii
Power supply
13.6V
To chassis GND
[|
30A
o
o
Connect power
4Q
cord to 13.6V
dummy
load
Oscilloscope
Distortion
meter
AF voltmeter
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