Kenwood TS590SG User Manual

77

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).

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.

 

 

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.