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The SO-3 option improves the transceiver frequency stability to ±0.5 ppm.

1Remove the CN503 connector and TCXO PCB screw, as shown below.

CN503

TCXO PCB

2Remove the TCXO PCB.

3Insert the SO-3 TCXO.

4Solder all pins on the reverse side of the PCB.

5Re-insert the TCXO PCB in the transceiver.

6Connect the CN503 and tighten the screw.

7Move the C903 and C904 jumper as shown below.

TC501

CN904

CN903

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Note: The transceiver is adjusted at the factory prior to shipping. Do not perform this adjustment unless it is necessary.

1Set the following on the transceiver:

•Mode: CW

•AF control: Center

•Menu No. 34 (CW RX pitch): 800 Hz

•SHIFT control: 800 Hz

•RIT function: OFF

•Break-in function (VOX): OFF

2Remove the bottom case (10 screws) from the transceiver.

3Tune 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:

faf = (fdisplay/15.600 x ∃freference) + 800 Hz where ∃freference is the shift from the 15.6 MHz reference frequency.

4Close 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 ∃freference is the shift from the 15.6 MHz reference frequency.

5TS-590S 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-590S 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.

Note:

XTo avoid misplacing the jumper, keep it attached to 1 pin of C903 or C904.

XWhen removing the SO-3 TCXO, replace the jumper to its original position.

8Replace the bottom case (10 screws).

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