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40 MHz Radio transmitter boost

Discussion in 'Electronic Equipment' started by Abdul Ahad, Aug 11, 2003.

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  1. Abdul Ahad

    Abdul Ahad Guest

    Hi,
    Can someone please tell me which component to adjust/change to
    increase the range of my 40 MHz transmitter in my remote control car?
    (Don't tell me to use a signal booster or better antenna at the
    receiving end, I don't want to do this - I want to boost the
    transmitter.)

    Thanks
    AA
    http://uk.geocities.com/aa_spaceagent/
     
  2. CWatters

    CWatters Guest

    It's not that easy and possibly illegal to boost power output. The output
    power of transmitters for model control is limited by the
    Radiocommunications Agency http://www.radio.gov.uk/

    If you have a good quality make of equipment (Futaba etc) the range should
    be almost out of site so perhaps there is a fault with your system?

    If you want to experiment try increasing the length of the Tx aerial - but
    don't blame me if...

    a) the output stage overheats and fails
    b) the cops arrive claiming you are interferring with the local air traffic
    control.
    c) the local model car club turn up to complain you are interferring with
    their cars.

    This site has info on other users of the 40MHz band.....

    http://www.radio.gov.uk/publication/ra_info/ra365.htm

    Note that "Exempt from licensing" does not mean you can do what you like.
     
  3. A E

    A E Guest

    If the OP has an old style (crystal) set, he might need to retune it if he
    changed the crystal.
     
  4. CWatters

    CWatters Guest

    I think all modern 40MHz sets with changable xtals are of sufficient quality
    that crystals can be changed without needing retuning.

    A damaged xtal might be a possibility? A damaged Rx aerial might be as well?

    Most likely he has one of these micro cars that have become popular in
    recent years. I believe they are very heavily cost engineered and not
    intended to have huge range.
     
  5. CWatters

    CWatters Guest

    I wouldn't start with the transmitter from a toy car!

    Love your web site. Haven't laughed so much in ages.

    Perhaps you need to visit ebay for some radar parts

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3141332850&category=733
     
  6. Abdul Ahad

    Abdul Ahad Guest


    Glad you enjoyed my site, that's what its there for.
    Your recommended link on e-bay was not so funny though. I suggest you
    bookmark my website and visit frequently if you want to be kept
    informed?!

    One day, hopefully in the not too distant future, you may read a
    headline there along the lines of: "AA Institute's Department of
    Communications unveils new Interplanetary Space Surveillance Radar
    (ISSR) installations 35,000 km above Earth!"

    AA
    http://uk.geocities.com/aa_spaceagent/
     
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