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Old December 29th 08, 02:56 AM posted to rec.radio.amateur.homebrew
Tio Pedro Tio Pedro is offline
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First recorded activity by RadioBanter: Jan 2008
Posts: 239
Default RF probe for millivolts?


"K7ITM" wrote in message
...
To be sure I'm not trying to blow smoke some bad place, I just tried
this, with a 1N4148 as detector. Using a _very_ cheap DVM with 1
megohm input resistance, I got 0.1mV output with about 30mV RF input.
With a better DVM with 10 megohm input resistance, 15mV of RF is
easily detectable at 0.1mV output. This was at 50MHz, but holds down
at lower frequencies too.

Cheers,
Tom

You ain't blowing smoke or whistling Dixie, otherwise the diode
detector probes for the Boonton RF millivolters would never
have worked!

Pete