Kenwood Low Power Tune Adapter for Icom LDG Automatic ATU AH-4 LDG Antenna Tuner D3

This is a convenient kit of parts that enables you to build a simple adapter as originally suggested by N2MU, so that you can use an Icom or LDG tuner (any tuner which uses the 4 wire interface and Icom protocol) with your Kenwood radio. It can also be used to reduce output power from the Kenwood radio to allow manual tuning of a mobile antenna such as a Screwdriver.

The kit consists of the correct connectors to join the radio and tuner together along with a couple of components which "fool" the Kenwood radio into thinking an Kenwood tuner is connected.

When the Kenwood radio is first switched on, its software "reads" the presence of the adapter. Subsequently, when the AT button is pressed, Pin 5 momentarily goes low and puts a pulse on Pin 2 via the series C & R. This starts the tuner which replies by holding Pin2 low causing the radio to transmit with low power. Once tuned the ATU releases Pin 2 and the radio goes back to receive.

The circuit and theory of operation are widely published on the web and I believe something similar can be purchased ready made under the tune right or tenner tuner names. N2MU had a good discussion on his website but this is now down, however the circuit is very simple, see the picture.

Please check that this is suitable for your radio and tuner before purchase.

Easy to assemble, just add a short cable.

Please take great care when connecting to the external tuner or accessory socket on ANY radio because incorrect connections can destroy internal components.

If you are unable to assemble this kit for yourself or for any other questions please contact me.

See my other listings for a Kenwood manual tune adapter and many other Icom Kenwood Yaesu LDG plugs and sockets.

Delivery Details
Royal Mail 2nd class economy non-tracked UK Delivery included.
Optional Royal Mail 1st class UK Delivery.
Worldwide delivery uses economy non-tracked airmail.
All orders received before 0800 UTC on working days are normally shipped the same day - otherwise the next working day.

If you have chosen economy non-tracked delivery please do not open cases for items lost or delayed in the post. Tracked delivery is available on request.

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