Calculating Rtn Loss

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blackeagle603
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Joined: Tue Aug 19, 2008 4:13 am

Calculating Rtn Loss

Post by blackeagle603 »

Old shipmate posted to me saying he needs to calculate return loss of an antenna. It's three separate antennas through a 3 -way diplexer, one coax cable. I forgot all that stuff 20 years ago. Not sure if it's a predictive/modeling thing or if he's got a setup now that he can actually instrument and measure.

VSWR = rtn loss in db, si?
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randy
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Re: Calculating Rtn Loss

Post by randy »

Here are a couple of on line calculators he can use, along with some discussion of how to derive it:

http://vk1od.net/calc/tl/tllc.php

http://www.saarsham.net/coax.html

When I get home I'll try to dig through my antenna books and see if I can come up with anything else
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randy
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Re: Calculating Rtn Loss

Post by randy »

Some additional information from the ARRL web site:

http://www.arrl.org/files/file/Technolo ... 106037.pdf

http://www.arrl.org/files/file/Technolo ... qex044.pdf

Hope these help
...even before I read MHI, my response to seeing a poster for the stars of the latest Twilight movies was "I see 2 targets and a collaborator".
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