Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
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design engineer. The World Wide Web (Internet) was largely an unknown entity at
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directional detector? - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
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Forums activity dropped off precipitously. If the folks at
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but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: directional detector?
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).
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.