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Homebrew RF millivolt meter

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Homebrew RF millivolt meter Empty Homebrew RF millivolt meter

Post by Ragwire on Wed Mar 19, 2014 5:20 pm

It works well up to about 3MHz and is fairly accurate. It does all I need it to do and seems to pick up the RF voltage in tube radios without excessive loading. Handy for quick checks, but mostly done for the fun/challenge.

Homebrew RF millivolt meter RF2_zpsb5ae87a4
Homebrew RF millivolt meter RF1_zps2cd3c6c3
Homebrew RF millivolt meter RF4_zpsc9c18ef9
Homebrew RF millivolt meter RF5_zpsc7d6a9c3
Homebrew RF millivolt meter RF8_zps0ca0b833
Ragwire
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Homebrew RF millivolt meter Empty Re: Homebrew RF millivolt meter

Post by N7ZAL on Wed Mar 19, 2014 9:12 pm

Nice and always like the HB equipment !
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Homebrew RF millivolt meter Empty Re: Homebrew RF millivolt meter

Post by Ragwire on Thu Mar 20, 2014 12:10 pm

 Thanks. It was certainly an education in broadband RF amplifier design in trying to get it to 1. Gain enough 2. Not oscillate 3. Have pretty much a flat gain across a wide range of frequencies. 4. Have good input impedance.

Lots of tweaking and reading...Fun though...learned lots.  Very Happy 
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Post by N7ZAL on Thu Mar 20, 2014 12:25 pm

One of the great experiences of learning is making HB stuff. I don't think I ever built something that didn't need "tweaking" or modifications, but it is a great feeling getting it to finally work.  Wink 
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