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Kenwood TS440s/at Hi, I have a Kenwood TS440S/AT ham radio which won't transmit. I have been told it may be the switching relay. Any more ideas please? Regards, Stan. G1YGJ.

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  • Stan. Mar 11, 2008


    Thanks for the reply.

    I have tried it into an aerial that is know to be good and that is used regularly buy a fellow ham at his QTH.

    I bought the radio a couple of weeks ago and the previous owner assures me that it was OK when it left him. He has even offered to contribute to the costs or refund my money. But I want the radio fixed rather than send it back.

    The needle drops to 0 when the mic is keyed and also when the "send" button is pressed on the front panel.

    The auto ATU obviously doesn't operate as there's no TX.

    Everything else works, it's fine on receive.



  • Stan. Mar 13, 2008


    I have done all those things ad suggested and all appears to be in order!.

    I'm sure it's something silly and simple though.



  • Palmbeach
    Palmbeach May 11, 2010

    Hi again Stan

    Almost certainly in that case, something has just come adrift during transportation. I would slip the top cover off and take a good look around.

    There may be a ribbon cable that has pulled away from its socket or a relay that is not secure. The TS440 is quite small but it is reasonably easy to work on as it predates much of the micro technology used today.

    Take a look at the tuning control board.

    These usually have a pin diode matrix that prevents transmit on frequencies outside the amateur bands. It would be an idea to check that the board is secure.

    Also try the transmitter on different bands.

    Look for a setting that turns the PA off for use with a linear amplifier in case this has been inadvertently selected. Could be a slide switch.

    I can't remember whether the auto atu is switchable on the 440 as it is with my TS940SAT and TS950SDX. If it can be turned off, then do that in case there is a problem there.

    It sounds as though the person you bought it from is genuine so I guess it will be simply to sort out. Bit depressing for you though :-(

  • Palmbeach
    Palmbeach May 11, 2010

    Have you tried the transceiver into a dummy load?

    Have you tried different modes?

    When you press the key or switch to Tune, exactly what happens?

    It could be a relay but it is more likely to be the power supply especially if the PA has been overdriven or has been used with a mismatched antenna.

    If you are trying to transmit into a very poor match, the PA will shutdown and will not allow you to transmit.

    What happens to the meter when you try to transmit?



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Posted on Mar 11, 2008


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