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directional detector? - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


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.




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