Kenwood TS-570S, TS-570D Internal Adjustments, Maintenance, Reference Frequency Calibration

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16 MAINTENANCE

INTERNAL ADJUSTMENTS	6 Adjust the TC500 trimmer to minimize the frequency
	difference between the received 800 Hz tone and
	the 800 Hz sidetone.
REFERENCE FREQUENCY CALIBRATION

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Note:

◆The transceiver is adjusted at the factory prior to shipping. Unless necessary, DO NOT perform this adjustment.

◆If you have installed the optional SO-2 unit, you cannot perform this adjustment.

1Set the following on the transceiver:

•Mode: CW

•AF control: Center

•Menu No. 20 (CW RX pitch): 800 Hz

•IF SHIFT control: Center

•Receive bandwidth {page 38}: 600 Hz

•RIT function: OFF

•Break-in function (VOX): OFF

2Remove the bottom case (8 screws) from the transceiver.

3Remove the protective cover installed on the PC board (6 screws).

4Tune in a standard frequency station such as WWV or WWVH at, for example, 10.000 or 15.000 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/20.000 x Δfreference) + 800 Hz where Δfreference is the shift from the 20 MHz reference frequency

5Close your CW key and 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 Δfreference is the shift from the 20 MHz reference frequency

TC500

7Re-install the protective cover on the PC board (6 screws).

8Re-install the bottom case (8 screws).

ACCESSING THE INTERNAL FUSE

1Remove the top case (8 screws) from the transceiver.

2Remove the 12 screws that fasten the inner cover to the chassis.

3Open the inner cover.

•Be careful not to damage the speaker cable connected to the PC board.

Fuse (4A)

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