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Author Topic: tape measure 70cm yagi  (Read 6371 times)
AE7GL
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Posts: 62




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« on: May 28, 2010, 11:38:49 AM »

I've been thinking about making up a 70cm tape measure yagi. Something similar to the 2mtr tape measure yagis used for RDF work. (http://theleggios.net/wb2hol/projects/rdf/tape_bm.htm) Except I'm thinking a 7 element version that could be used listen to the downlink from AO-51 or other FM satellites.

So far I haven't found any examples of one after searching the web. I also haven't tried modeling anything yet, but I'm considering trying to duplicate the 70cm half of the arrow dual-band yagi that seems so popular.

I already have a 2mtr tape measure yagi and it works amazingly well for hitting distant repeaters. I just thought a 70cm version would make a nice companion to try to start working satellites with.

Any thoughts, suggestions, or advice would be appreciated.

Thanks,
73 de AE7GL
Charlie
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KA1DBE
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Posts: 121




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« Reply #1 on: May 30, 2010, 06:43:59 AM »

I don't see why it would not work.  I built a couple of "Cheap Yagis" when I first started.  I built the 435 version first and it worked like a champ.  I would think you could use those lengths as a starting point.  Not sure what size hair pin you would need at the feed though.  Google "Cheap Yagis" and it will take you right to the site.

73's,
Jeff
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K6LCS
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« Reply #2 on: May 30, 2010, 11:16:48 AM »

The Tape Measure Yagi plans at this site work on the FM birds ...

http://www.work-sat.com

SOURCE: Personal experience!

Clint, K6LCS
909-241-7666
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Clint Bradford, K6LCS
http://www.k6lcs.com
AE7GL
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Posts: 62




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« Reply #3 on: June 02, 2010, 08:55:37 PM »

Thanks all. Sorry about the slow reply. You know how life gets in the way sometimes. I think I will build this thing and see what it does.

Thanks again,
Charlie
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K6LCS
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« Reply #4 on: June 16, 2010, 06:00:19 PM »

>> ...  I think I will build this thing and see what it does ...

You will be AMAZED at the performance. I talked about these in my sat presentations and demos - but never had one myself. Built one last December, plugged it into my HT, and heard a NOAA weather station in San Diego that I had NEVER heard before on an HT. Truly amazing gain-to-price ratio!

Clint, K6LCS
909-241-7666
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Clint Bradford, K6LCS
http://www.k6lcs.com
AE5NE
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Posts: 91




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« Reply #5 on: June 17, 2010, 12:14:18 PM »

Tape elements are normally used because the yagi elements are long, get in the way, and bend too easily.

For 70cm, however, normal rigid elements are short enough that the antenna is able to be handled easily.

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