Kenwood TH-79AKSS operation manual Operation

ITEM	QUANTITY
I/O UNIT	1
￿ 2.5mm Stereo Cable	1(use for TH-D7A only)
Operation Manual	1

OPERATION

nOutline

To operate the system, follow these basic procedures.

1)Connect the two TH-79AKSSs, the I/O UNIT, and the HF transceiver (TS-570D(G)/S(G) or TS-870S).

2)Place one of the TH-79AKSSs in CMD mode, and the other in TRP mode.

3)Set up your HF transceiver.

4)Start your operation.

nEquipment Interface

Connect the equipment as shown on page 2. Be sure to turn OFF the HF power source and the two TH-79AKSSs before beginning.

nSetting the Mode

Note: The security code for your KSS consists of both your DTSS code and your CTCSS frequency.

∙This system is set up to operate only if the DTSS code, and CTCSS frequency is matched on the 440 MHz band, between the two portable transceivers. You must decide these two settings. The same frequencies and DTMF code MUST be used when setting up the TRP mode.

∙The received HF signal is transmitted from the TRP to the CMD on the 144 MHz band. Choose a frequency which does not interfere with local stations.

∙The transmit (TX) voice signal and control signals for HF are transmitted from the CMD to the TRP on the 440 MHz band. Choose a frequency which does not interfere with other local stations.

MEMO

DTSS CODE

CTCSS FREQUENCY

FREQUENCY IN THE 144 MHz BAND

FREQUENCY IN THE 440 MHz BAND

nSetup Procedure

1)Turn the power ON for the portable transceiver being used for CMD.

2)Set up its DTSS code and CTCSS frequency on the 440 MHz band, its operating frequency on the 144 MHz band, and its operating frequency on the 440 MHz band. (For operation of the TH-79AKSS, refer to its Operation Manual).

3)Turn off the transceiver’s power.

4)Press and hold the PTT and VFO buttons, then turn on the transceiver’s power. The following display appears when the CMD mode is setup successfully.

Note:

uTurn OFF the following functions: transmit inhibit, DTSS, paging, bell, and ABC.

uUsing a high CTCSS frequency may cause an audible tone to be output from the speaker of the HF transceiver. If this happens, select a lower CTCSS frequency which does not cause the problem.

nSetup Cancellation

1)Turn OFF the CMD transceiver’s power.

2)Push and hold the PTT and VFO buttons, then turn ON the transceiver’s power. Cancellation is successful when “Sky” andCmd”“ no longer appear on the screen.

CMD mode provides the set-up for sending “orders” to the HF transceiver, and receiving band activity from the HF transceiver. When you push the PTT button on the CMD, it transmits. At the same time, the HF transceiver also transmits.

The received volume can be controlled on the CMD. Several of the DTMF keys have specific purposes in controlling the HF transceiver. (See the diagram on page 4).

nOther Limits in CMD Mode

While the HF transceiver is in CMD mode, extra functions such as lamp, monitor, and power change-over will operate along with the functions mentioned above. All other functions are inhibited. For example, in order to change the frequency, you must first return to the conventional operation mode.

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