Kenwood TS-820 manual Internal Cross Channel Operation, Mobile Operation, Rtty Operation

The crystal frequency is determined by the following formu- las.

Cgystal Frequency (MHz) = 5.5 MHz + X - Operating Fre- quency [MHz)

X - 1.8 for the 160 meter band

X= 3 . 5 for the 8 0 meter band X = 7.0 for the 4 0 meter band X = 14.0 for the 2 0 meter band X = 21 . 0 for the 15 meter band

X= 28 . 0 for the 1 0 meter band or X = 28.5 for the 1 0 meter band or X = 29 . 0 for the 10 meter band or X = 29.5 for the 1 0 meter band

Crystal Specifications: HC-25/U holder. 5 . 0 to 5 . 5 MHz os- cillation frequency. and see Figure 9 for type of oscillation

circuit.

Example: Desired Operating Frequency = 7.255 MHz Crystal Frequency = 5.5 MHz + 7.0 MHz -

7 . 255 MHz = 5.245 MHz

This same crystal will operate on each band. Operating Frequency = 5.5 MHz + X (in MHz) -

Crystal Frequency (in MHz)

Example: Crystal Frequency = 5.245 MHz

On the 1 4 MHz band the crystal will oscillate at Operating Frequency = 5.5 MHz + 14.0 -

5 . 245 MHz

=14.255 MHz

4 . 1 6 INTERNAL CROSS CHANNEL OPERATION

The TS-820 contalns a unlque design feature which allows cross channel operation without a separate external VFO. The TS-820'sinternal VFO is used together with the fixed frequency osc~llaltort o allow reception and transmission on different frequencles. he fixed channel oscillator must have one or more accessory crystals installed for this feature t o work.

FUNCTION TRANSMIT

1		1	Fixed channel
	V F O R	I	01cl1aIor

Fixed channel Fixed channel

I

4 . 17 MOBILE OPERATION

The compact size and solid-state design of the TS-820 make it deal for mobile use, by using optional DS-1.

Be sure to use a mobile antenna which meets the require- ments described in Section 2.

The normal operating procedures. described previously, ap- ply ro mobjle operation. The noise blaker should be used to reduce ignition and impulse noises for clear reception. Re- member that during transmission the transceiver draws about 15 amps so be careful not to drain the car's battery.

4.18 DX OPERATION (Use of PROCESSOR)

In DX (long distance) operation, i t may be desirable t o in- crease the talk~powerby using the speech processor. The speech processor used in TS-820 converts voice signals into 4 5 5 kHz SSB signals for compression at quick time cons- tant.

It produces little distortion and, unlike the clipper system does not deteriorate the tonal quality.

The compression level can be adjusted with the COMP LEVEL k n o b Set the meter knob to COMP and adjust so- that the meter indicates anywhere within the scale (20

4 0 dB). The speech processor is used only for DX opera- tion. In other operations such as local QSO, press in the COMP LEVEL knob so that signals can be heard more natu- rally.

4 . 1 9 RTTY OPERATION

For RTTY operation, the use of demodulator and teletypewriter is essential The demodulator should be de- signed to operate from audio inputs and equipped with a fil- ter f o r - 2 1 2 5 / 2 2 9 5 Hz (NARROW. 1 7 0 Hz shift) or 2125/2975 Hz (WIDE. 8 5 0 Hz shift).

To key-in the FSK circuit of T S ~ 8 2 0 .insert a relay coil into the closed loop c~rcuitof teletypewriter and connect the re- lay contact to the RTTY KEY jack on the rear panel. Fig. 1 0 shows the relat~onshipbetween the transmit and receive fre- quenc~esof TS-820.

The frequency shift of the FSK clrcuit is preset at the factory to NARROW but it can bechanged to WlDE by inserting the connector as shown in Fig. 11. When operating at the WlDE posirion, turn the IF SHIFT knob in the " - " direction by about 1.2 kHz so that the mark and space signalsare well balanced during reception. If a CW filter (option) is used for NARROW operation. change the position of the connector of the IF unit (refer t o "Operation with CW Filter").

Setting the MODE switch t o FSK automatically decreases the input power of the final stage, permitting a long time of continuous operation.