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Author Topic: Tape Measure HT Antenna  (Read 497 times)
KB1OCC
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Posts: 172




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« on: June 19, 2009, 06:09:11 PM »

OK, I've built a tape measure 2 meter beam/DF antenna that works great.  I'd like to build a tape measure HT antenna by soldering 19" or so of a tape measure tape onto a BNC connector that fits one of my HTs.  I was trhinking of using a rat's tail as a counterpoise.

What do you guys think?  Are there any products out there like it?  I am going to try to locate some narrow tape that will still stay straight at 19".

What do you think about a 1/2 wave?
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KE4DRN
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Posts: 3734




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« Reply #1 on: June 21, 2009, 05:36:00 PM »

hi Brian,

can you use a short cable to connect instead of
direct to the bnc on the ht ?

these connectors can get stressed easily and
will need to be replaced.

how about a pair of telescopic antenna rods
mounted to a piece of pvc ?

http://www.allelectronics.com/make-a-store/item/ANT-34/20.75-TELESCOPING-ANTENNA/1.html

73 james
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WX7G
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Posts: 6210




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« Reply #2 on: June 21, 2009, 05:59:05 PM »

I like your invention!

I have seen these tiny tape measures at Home Depot that might work.

For a radial you holding the handheld serve that purpose. Of course a 19" radial will improve the situation.

For the halfwave you need (as you know) a matching circuit. A parallel resonant LC having and X of 500 ohms or less will work. Then tap along the inductor for a 50 ohm match.
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