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* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *



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*2021 AND SOME EVENTS ARE BEING PROPOSED. Keep them coming and let us know the details! (amstreasure@googlemail.com)

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Model Sub Weekend, 28th, 29th August. Bluewater Parkway, Greenhithe, DA9 9

Bournville Sub Day. Sept 2021 is looking likely. More details TBA.

Barrow in Furness Regatta and Sub day. Maybe in Sept 2021. Details TBA.

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Latest topics

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Graupner X-408 Transmitter EmptyTue Jul 20, 2021 9:31 am by david f

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» UHF radio control for submarines (openLRS, LoRa, FSK etc. on 458Mhz and 433Mhz )
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» Bonjour from France.
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» Underwater navigation using UHF ?
Graupner X-408 Transmitter EmptyFri Jun 25, 2021 5:46 pm by SimonH

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    Graupner X-408 Transmitter

    avatar
    Kevin D

    Posts : 129
    Join date : 2014-04-24
    Age : 59
    Location : Norwich

    Graupner X-408 Transmitter Empty Graupner X-408 Transmitter

    Post  Kevin D 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 !!!
    david f
    david f
    AMS Treasurer

    Posts : 2172
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    Graupner X-408 Transmitter Empty Re: Graupner X-408 Transmitter

    Post  david f 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
    avatar
    Kevin D

    Posts : 129
    Join date : 2014-04-24
    Age : 59
    Location : Norwich

    Graupner X-408 Transmitter Empty Re: Graupner X-408 Transmitter

    Post  Kevin D 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?
    david f
    david f
    AMS Treasurer

    Posts : 2172
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    Graupner X-408 Transmitter Empty Re: Graupner X-408 Transmitter

    Post  david f 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

      Current date/time is Thu Jul 29, 2021 10:02 pm