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    Graupner X-408 Transmitter

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    Kevin D
    AMS Forum Administrator

    Posts : 129
    Join date : 2014-04-24
    Age : 55
    Location : Norwich

    Graupner X-408 Transmitter

    Post  Kevin D on Wed Aug 20, 2014 10:53 pm

    I have purchased two NOS Graupner X-408 40mhz 4 channel transmitters without receivers. Does anyone know what make receivers are compatible with these, other than Graupner. I have tried my Futaba receiver but that does not work.

    Hoping these aren't lame ducks !!!
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    david f
    AMS Treasurer

    Posts : 1869
    Join date : 2010-11-10
    Age : 66
    Location : Cumbria

    Re: Graupner X-408 Transmitter

    Post  david f on Tue Aug 26, 2014 12:00 pm

    I have had a look at the (English) instruction manual for these and all the basics look fine, because it is:
    - FM
    -PPM
    -1.5 m seconds range for the servos.

    If your Futaba receiver had the right crystals you should have got some response.

    Anyone any ideas?

    David


    Last edited by david f on Wed Aug 27, 2014 12:09 pm; edited 1 time in total

    Kevin D
    AMS Forum Administrator

    Posts : 129
    Join date : 2014-04-24
    Age : 55
    Location : Norwich

    Re: Graupner X-408 Transmitter

    Post  Kevin D on Tue Aug 26, 2014 12:34 pm

    Thanks David, I hadn't really thought about crystal compatibility, I had 40mhz Futaba compatible crystals in both TX and RX.

    I haven't generally experienced any issues with mix and match on my 27mhz gear which I use for fast electric boats, so I didn't really think about it.

    Could that be my problem?
    avatar
    david f
    AMS Treasurer

    Posts : 1869
    Join date : 2010-11-10
    Age : 66
    Location : Cumbria

    Re: Graupner X-408 Transmitter

    Post  david f on Wed Aug 27, 2014 12:12 pm

    Crystals are a bit of a black art but I thought Futaba would be some sort of standard.

    You've presumably got the right type in the receivers (Dual or Single conversion.)

    Anyone any experience of Graupner and crystals?

    David

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