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77
INSTALLING OPTIONS 14
SO-3 TCXO
The SO-3 option improves the transceiver frequency
stability to ±0.5 ppm.
1 Remove the CN503 connector and TCXO PCB
screw, as shown below.
TCXO PCB
CN503
TCXO PCB
CN503
2 Remove the TCXO PCB.
3 Insert the SO-3 TCXO.
Align the SO-3 TCXO adjustment hole with the
“O” on the TCXO PCB.
4 Solder all pins on the reverse side of the PCB.
5 Re-insert the TCXO PCB in the transceiver.
6 Connect the CN503 and tighten the screw.
7 Move the C903 and C904 jumper as shown below.
CN903
CN904
TC501
Note:
To avoid misplacing the jumper, keep it attached to 1 pin of
C903 or C904.
When removing the SO-3 TCXO, replace the jumper to its
original position.
8 Replace the bottom case (10 screws).
REFERENCE FREQUENCY CALIBRATION
Note: The transceiver is adjusted at the factory prior to shipping.
Do not perform this adjustment unless it is necessary.
1 Set the following on the transceiver:
• Mode: CW
AF control: Center
Menu No. 40 (CW RX pitch): 800 Hz
SHIFT control: 800 Hz
RIT function: OFF
Break-in function (VOX): OFF
2 Remove the bottom case (10 screws) from the
transceiver.
3 Tune in a standard frequency station such as WWV
or WWVH at, for example, 10.000.00 MHz 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 f
reference
) + 800 Hz
where 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 f
reference
is the shift from the 15.6 MHz
reference frequency.
5 TS-590SG transceiver without SO-3:
Adjust the trimmer (TC501) to minimize the
frequency difference between the received 800 Hz
tone and the 800 Hz sidetone.
TS-590SG transceiver with SO-3:
Adjust the trimmer inside the SO-3 using the
supplied plastic adjustment tool. Minimize the
frequency difference between the received 800 Hz
tone and the 800 Hz sidetone.
85


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