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directional detector? - RF Cafe Forums

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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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Profile

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.

Posted  11/12/2012

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