I have a handheld frequency counter that measures from DC to 2 GHz.
It has a BNC connector and 50 ohms input impedance.
( Battery operated )
It does okay measuring transmitter frequencies with a stub antenna.
I tried to measure a TTL level signal at that is around 500KHz.
The readout bounced around and was clearly reading RFI from the board.
What kind of probe can I put on this puppy to read TTL signals and  
ignore
RFI ?
Regards

Gus S Calabrese
Denver, CO
720 222 1309     303 908 7716 cell
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