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Directional Detector? - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


mark_gidney
Post subject: directional detector?
Unread postPosted: Thu Jan 27, 2005 6:11 pm

Hi There,
I bought two directional detectors at a swap shop, but I can't seem to get them to work. Their frequency ranges are from 400MHz to 1GHz and when I put 500MHz into them at 30dBm I can't measure anything out of the detector port. The in-line port has N-connectors and the detector port has RCA connectors like you get on your stereo. I'd really like to use these, but I can't measure anything out of the RCA connector port. I used a dc voltmeter and I used a scope on 5mV/div. I hope this isn't a stupid question? Do I somehow have to bias the RCA port? Thanks a lot.
Sincerely,
Mark Gidney,
Nova Scotia, Canada


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Rod
Post subject:
Unread postPosted: Sat Jan 29, 2005 3:53 am

Directional detectors use diodes. I hope 30dBm wasn't too much.

:smt025


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billclub
Post subject:
Unread postPosted: Wed Apr 20, 2005 9:51 am
Offline
Lieutenant

Joined: Sat Apr 02, 2005 2:16 pm
Posts: 2
Location: NJ
Sometimes detectors lack an internal DC termination which is required.

Try adding a 3 dB coax pad between the detector and voltmeter, (or otherwise provide a dc termination).

good luck.

Bill


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Guest
Post subject:
Unread postPosted: Wed Apr 20, 2005 11:58 am

I agree with Rod, 30dBm may have blown the diodes or the diodes were already blown when you bought the detector.




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