Internal Adjustments; Reference Frequency Calibration; Digital Recording Unit; External Tuner (Optional) - Kenwood TS-870S Instruction Manual

12
12 MAINTENANCE
INTERNAL ADJUSTMENTS
REFERENCE FREQUENCY CALIBRATION
Note: The transceiver is adjusted at the factory prior to shipping.
Unless necessary, DO NOT perform this adjustment.
1 Remove the top case (10 screws) from the
transceiver.
2 Set the following on the transceiver:
« Mode: CW
+ MONI control: Center
+ AF gain control: Center
+ Menu No. 24 (CW PITCH): 800 Hz
HI/SHIFT control: 800 Hz
+ LO/WIDTH control: 1000 Hz
RIT function: OFF
Break-in Function (VOX): OFF
3 Tune ina standard frequency station such as WWV
or WWVH at, for example, 10.000 or 15.000 MHz.
Adjust the transceiver Tuning control so the Display
reads the exact frequency of the station. You should
hear a beat tone of approximately 800 Hz.
For 800 Hz:
fat = (feispiay/20.000 X Afreterence) + 800 Hz
where Afreterence is the shift from the 20 MHz
reference frequency
4 Close your CW key and you will hear a transmit
sidetone of approximately 800 Hz. This sidetone
produces a double beat tone when it combines with
the received signal. Adjust the AF gain contro! and
the MONI control so you can hear the double beat
clearly.
For 800 Hz:
feidetone = 800 Hz x [(20 x 108 + Afreterence)/20 x 105}
where Afretoronce is the shift from the 20 MHz
reference frequency
Remove the
top case.
70
DRU-3 DIGITAL RECORDING UNIT (OPTIONAL)
RECORD LEVEL ADJUSTMENT
Remove the
bottom case.
AT-300 EXTERNAL TUNER (OPTIONAL)
FUSE LOCATION
Remove the
top case.