Reference Frequency Calibration - Kenwood TS-480HX Instruction Manual

15 INSTALLING OPTIONS
• SO-3: The calibration hole must be on the right
side, looking from the front panel.
• IF filters: Insert a primary IF filter in the OPTION
FILTER1 location, and a secondary IF filter in the
OPTION FILTER2 location. The transceiver
automatically detects what optional IF filter(s) is
installed when it is turned ON.
5 Solder all pins on the reverse side of the PCB.
• SO-3: Cut the 2 wires marked as R103 and R104,
as shown below.
R104 R103
6 Replace the PCB in the transceiver and press
both the tabs downwards until secure.
7 Tighten the 3 screws and replace the top cover.
82
X1

REFERENCE FREQUENCY CALIBRATION

The transceiver is adjusted at the factory prior to shipping.
Note:
Unless necessary, DO NOT perform this adjustment.
1 Set the following on the transceiver:
• Mode: CW
• AF control: Center
• Menu No. 34 (CW RX pitch): 800 Hz
• IF SHIFT control: Center
• RIT function: OFF
• Break-in function (VOX): OFF
2 Remove the top case (8 screws) from the
transceiver.
3 Tune in a standard frequency station such as
WWV or WWVH at, for example, 10.000.00 or
15.000.00 MHz.
• Adjust the Tuning control so that the display
reads the exact frequency of the station.
• You should hear a beat tone of approximately
800 Hz.
• For 800 Hz:
f = (f /15.600 x ∆f
af display
where ∆f is the shift from the 15.6 MHz
reference
reference frequency.
4 Close your CW key. 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 control to hear the double beat
clearly.
• For 800 Hz:
f = 800 Hz ±50 ppm (= 800 ±0.04 Hz)
sidetone
where ∆f is the shift from the 15.6 MHz
reference
reference frequency.
5 TS-480 transceiver without SO-3:
Adjust the trimmer (TC1) to minimize the
frequency difference between the received 800 Hz
tone and the 800 Hz sidetone.
TS-480 transceiver with SO-3:
Adjust the trimmer inside the SO-3 using the
supplied plastic adjustment tool (W01-0406-XX).
Minimize the frequency difference between the
received 800 Hz tone and the 800 Hz sidetone.
6 Replace the top cover (8 screws).
) + 800 Hz
reference