directional detector? - RF Cafe Forums
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Post subject: directional detector?
Unread postPosted: Thu Jan 27, 2005 6:11 pm
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.
Nova Scotia, Canada
Unread postPosted: Sat Jan 29, 2005 3:53 am
Directional detectors use diodes. I hope 30dBm wasn't too much.
Unread postPosted: Wed Apr 20, 2005 9:51 am
Joined: Sat Apr 02, 2005 2:16 pm
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).
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.