Yaesu FT-897 Technical Supplement page 15

Power Amplifier Adjustment
HF/50 MHz Idling Current Adjustment
r Tune the transceiver to any HF band, or to the 50 MHz
band.
r Disconnect the jumper between TP3021 and TP3022.
r Connect the ammeter between TP3021 and TP3022.
r Turn VR3002 fully counterclockwise.
r Press the PTT, and adjust VR3002 for an indication
of 300 mA (±10 mA) on the ammeter.
r Re-connect TP3021 and TP3022.
V/UHF Idling Current Adjustment
r Tune the transceiver to the 430 MHz band.
r Connect the ammeter between TP3021 and TP3022.
r Connect the ammeter between TP3021 and TP3022.
r Turn VR3001 fully counterclockwise.
r Press the PTT, and adjust VR3001 for an indication
of 300 mA (±10 mA) on the ammeter.
r Re-connect TP3021 and TP3022.
TP3021
TP3022
TP3001
VR3002
Directional Coupler Balance Adjustment
r Terminate the antenna jack into a 50-Ohm dummy load.
Set the mode to CW, and connect the DC voltmeter to
TP3001.
r Tune the transceiver to the 28 MHz band, and key the
transceiver.
r Adjust TC3002 for minimum indication on the DC
voltmeter.
r Tune the transceiver to 439.995 MHz, and key the trans-
ceiver.
r Adjust VR3003 for minimum indication on the DC
voltmeter.
r Leave the transceiver on 439.995 MHz band and key
the transceiver.
r Adjust TC3001 for maximum indication on the RF
Power meter.
Alignment
TC3002
VR3003
TC3001
VR3001
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