Kenwood TS-480HX Operation Manual - Page 90

Installing Options, Reference Frequency Calibration

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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 X1 OPTTICOXNO MIC PANEL EXT.SP DATA REMOTE PADDLE KEY OPTIOONPFTIILOTNERF2ILTER1 COM 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. REFERENCE FREQUENCY CALIBRATION Note: The transceiver is adjusted at the factory prior to shipping. 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: faf = (fdisplay/15.600 x Δfreference) + 800 Hz where Δfreference is the shift from the 15.6 MHz 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: fsidetone = 800 Hz±50 ppm (= 800 ±0.04 Hz) where Δfreference is the shift from the 15.6 MHz 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). 82

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15
INSTALLING OPTIONS
82
•
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.
PADDLE
KEY
EXT.SP
DATA
REMOTE
COM
MIC
PANEL
OPTION FILTER2
OPTION FILTER1
TCXO
OPTION
R103
R104
X1
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.
REFERENCE FREQUENCY CALIBRATION
Note:
The transceiver is adjusted at the factory prior to shipping.
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
af
= (f
display
/15.600 x
Δ
f
reference
) + 800
Hz
where
Δ
f
reference
is the shift from the 15.6
MHz
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
sidetone
= 800
Hz
±
50 ppm (= 800
±
0.04 Hz)
where
Δ
f
reference
is the shift from the 15.6
MHz
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).