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TRC-70
74
ADJUSTMENT
5. Transmitting Meter Adjustment
=
. Make the adjustments outlined in steps 4-1 through
4-4 above. Except AG frequency : 1 kHz, level : 50
mv.
. Place the set in the transmit mode.
. Turn VR20 of the TX-RX unit until the LCD transmit-
ting meter reads that a ''8-point bar indicator'' goes
on.
. Return the set to the receive mode.
. H3E Carrier Level Adjustment
. Connect a power meter to the ANT terminal.
. Set that the memorizing frequency is 2.100.0 MHz
and that the mode is H3E.
. Place the set in the transmit mode.
. Turn VR11 of the TX-RX unit until the power is 45
W. (Specification: 45W + 5 W)
7. Protection Adjustment
WN
ap
. Connect a DC ammeter (30 A range) in series to the
(+) DC line.
. Strap the ANT terminaly with a check jig.
. Set that the memorizing frequency is 4.100.0 MHz
and that the mode is CW.
. Place the set in the transmit mode.
. Turn VR15
of the TX-RX unit until the ammeter read-
ing isi6 A. (Specification: 16 + 0.5 A)
. After adjustment is completed, return the set to the
receive mode.
Ammeter
TRC-70
13.6V DC
+
+ G;
DC power ?
(4)
il
supply
U
Uu
. Carrier Suppression Adjustment
. Connect a power meter to the ANT terminal via a
directional coupler.
. Connect a spectrum
analyzer to one side of the
directional coupler.
. Set that the memorizing frequency is 2.100.0 MHz
and that the mode is USB.
. Place the set in the transmit mode.
. Turn VR12 and VR13 of the TX-RX unit until the
spectrum analyzer reading is minimum.
Specification: 60 dB-lower than full power in the
CW mode
. Return the set to the receive mode.
ANT | Directional
coupler
Power meter
RADIO
Spectrum
analyzer
. Transmitting Frequency Characteristic Adjustment
. Connect a power meter to the ANT terminal via a
directional coupler.
. Connect an oscilloscope to one side of the direc-
tiona! coupler.
. Connect the two audio generators to Microphone
connector.
Also, connect an AF voltmeter to check
the AG output.
AG specifications:
AG1 frequency
350 Hz
Output
5 mV
AG2 frequency
2700 Hz
Output
5 mV
. Set that the memorizing frequency is 2.100.0 MHz
and that the mode is USB.
. Place the set in the transmit mode.
. Turn VR301 of the control unit until the waveform is
crossed.
7. Press the MOD key to enter the LSB mode.
8.
9. Turn VR302 of the control unit until the waveform is
Place the set in the transmit mode.
crossed.
10. Return the set to the receive mode.
10 kQ
AG1 : 350 Hz
AF voltmeter
1k?
ls mv
Microphone
AG2 : 2700 Hz
560 Q
connector
+
-O
ANT | Directional
RADIO
coupler
Power meter
Oscilloscope
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