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Re: [softrock40] Re: Wattmeter recommendation for QRP? UK or EU.

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  • Stewart Bryant
    ... You can build an RF wattmeter that is calibrated with just a DVM: Atter D, G3GRO, and Bryant S, G3YSX: The Crawley Power Meter Jan 16, Feb 31 (RADcom 2000)
    Message 1 of 6 , Aug 30, 2012
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      On 30/08/2012 14:29, warrenallgyer wrote:
      > Wattmeters graduate from being "relative power meters' when they are calibrated against a traceable standard or according to a replicable procedure. A couple of resistors and a diode will give you an approximation of power and can be used for relative power measurement between two sources, however cannot be used for accurate absolute power measurements unless calibrated.

      You can build an RF wattmeter that is calibrated with just a DVM:

      Atter D, G3GRO, and Bryant S, G3YSX: The Crawley Power Meter
      Jan 16, Feb 31 (RADcom 2000)

      This was for relatively low power, but was good to high VHF.

      The sense element was a small panel lamp.

      - Stewart/G3YSX
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