Kenwood TS-590SG Operation Manual - Page 87

So-3 Tcxo, Reference Frequency Calibration

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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 TCXO PCB 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 Remove the CN903 and CN904 jumper as shown below. TC501 CN903 CN904 INSTALLING OPTIONS 14 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: faf = (fdisplay/15.600 x freference) + 800 Hz where freference 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 freference 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. Note: ◆ To avoid misplacing the jumper, keep it attached to 1 pin of CN903 or CN904. ◆ When removing the SO-3 TCXO, replace the jumper to its original position. 8 Replace the bottom case (10 screws). 79

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79
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
Remove the CN903 and CN904 jumper as shown
below.
CN
9
03
CN
9
04
TC501
Note:
◆
To avoid misplacing the jumper, keep it attached to 1 pin of
CN903 or CN904.
◆
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.