So-3 Tcxo; Reference Frequency Calibration - Kenwood TS-590S Instruction Manual

14 INSTALLING OPTIONS

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.
CN503 CN503
TCXO PCB TCXO PCB
2 Remove the TCXO PCB.
3 Insert the SO-3 TCXO.
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.
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).
72
CN904
CN903

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. 34 (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 = (f /15.600 x Δf
af display
where Δf 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 Δf is the shift from the 15.6 MHz
reference
reference frequency.
5 TS-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.
) + 800 Hz
reference