RF isolation

Discussion in 'Wireless & RF Design' started by Will777, Oct 6, 2010.

  1. Will777

    Thread Starter Member

    Sep 12, 2010
    48
    1
    Hi,

    I am struggling to get a good reading using a RF sniffer/Frequency counter for a FM transmitter - could it be that it's also picking up other RF emissions?

    If that is the case, what DIY method can I use to build an RF isolation chamber so I can get accurate readings for the frequency counter?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. Will777

    Thread Starter Member

    Sep 12, 2010
    48
    1
    I've thought of that, but I was thinking that there must be an easier way to shield RF, like aluminium foil or something?
     
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    949
    Maybe a direct coupled connection would be better. try a 10 pf and 1 meg resistor and lower the resistor value if the counter doesn't get enough signal.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    The best is to mount the RF amplifier inside a metal box.
    I made a photo of an example of an RF amplifier I have here.

    [​IMG]

    Bertus
     
    Will777 likes this.
  6. Will777

    Thread Starter Member

    Sep 12, 2010
    48
    1
    Thanks, but this is not measured through an RF sniffer that connects to the antenna position on the circuit, it's a separate device with a telescopic aerial that measures RF output and determines frequency
     
  7. Will777

    Thread Starter Member

    Sep 12, 2010
    48
    1
    Dankie Bertus. I will definitely try that.
     
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