Bedienungsanleitung Kenwood TS-890S (Seite 178 von 196) (Englisch)

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Calibration of Internal Reference Frequency

The internal reference frequency of this transceiver is preadjusted

at the factory. However, if calibration of the internal reference

frequency is necessary due to changes over time or other reasons,

this can be done by receiving WWVH (Hawaii), WWV (Colorado),

BPM (Xi’an) or other types of standard radio wave.

First of all, follow the steps below to set this transceiver to the mode

for receiving the standard radio wave signals. The following is an

example of the calibration procedure when the pitch frequency is

700 Hz.

1 Press [CW/ CW-R] to select CW mode.

2 Press [RIT] to turn off the RIT function.

3 Press [VOX] to turn off break-in.

•

If semi break-in is turned on, press [VOX] to turn it off.

•

If full break-in is turned on, turn the [DELAY] control to select

a value other than full break-in.

4 Turn the [AF] control to move to the 12 o’clock

position.

5 Turn the [MIC/PITCH] control to adjust the pitch to

a level for easy listening.

Turn the [MIC/PITCH] control until the pitch frequency reading

shows “700”.

6 Turn the [LO/WIDTH] and [HI/SHIFT] controls.

Turn the [HI/SHIFT] control until the shift frequency (SHIFT)

becomes “0”, followed by turning the [LO/WIDTH] control to

adjust the bandwidth (WIDTH) to “1000”.

●

For details on the REF I/O connector settings, please

refer to “Switching the Reference Signal” (16-8).

Calibration Procedure

Once the preparation is complete, follow the steps below to

configure the internal reference frequency of this transceiver.

1 Receive the standard radio wave signals.

To receive 10 MHz standard radio wave signals, turn the

Tuning control to adjust the value to exactly “10.000.00”.

A 700 Hz beat is heard.

= f

reference

+ 700

[Hz]

display [MHz]

19.2

[MHz]

reference

Reference Frequency Shift

Adjust such that the received beat is audible on the CW pitch

frequency.

2 Press [MENU].

3 Press F [ADV.] to display the Advanced Menu

screen.

•

If F [ADV.] is not displayed, press F [MORE] to display F

[ADV.].

Select Advanced Menu [5] “Reference Oscillator

Calibration”.

5 Press F4 [SELECT].

6 Press F7 [CAL.T].

A 700 Hz calibration sidetone is generated. This sidetone

overlaps with the RX audio and a double beat is formed by the

difference in frequency.

If the double beat is not clearly audible, turn the [AF] control to

adjust the RX audio.

fsidetone = 700[Hz] 8[ppm]

‒

(700 0.006

[Hz])

‒

7 Press the F4 [–]/ F5 [+] or turn the [MULTI/CH]

control.

•

Perform adjustment until the cycle of the double beat

between the RX beat and sidetone reaches the maximum

and the double beat is no longer audible. At this point, the

difference in frequency between the RX audio and sidetone

is at the minimum level.

•

To restore the default setting, press and hold F2 [(RESET)].

8 Release F7 [CAL.T].

9 Press [ESC] to end the process.

●

If the signal used for calibration falls outside the range of

the reference signal input from an external source

(-10 dBm to +10 dBm) or frequency accuracy (10 MHz

±10 ppm), the internal reference frequency may not be

calibrated correctly.

17 MAINTENANCE AND ADJUSTMENT

17-2

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