Thread: Omni
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Old March 11th 12, 02:21 AM posted to rec.radio.amateur.antenna
Tuuk[_3_] Tuuk[_3_] is offline
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First recorded activity by RadioBanter: Oct 2011
Posts: 72
Default Omni

I don't have the ground planes for this antenna, just the vertical main
mast.

Used on the ground would be difficult because I am sandwiched between houses
all around me.

I wonder would the mismatch be so significant that the efficientcy of the
antenna be almost completely lost? If used with a good tuner would the
radiation resistence of the antenna become totally innefficient if I were to
completely ground it out through the tower? Nice idea having a omni all hf
band antenna. I run barefoot anyway.

I think I will try it out anyway, I have one of those MFJ old manual tuners
and am sure it would match the feedline coax with the antenna to the load.
Just curious how efficient the antenna would radiate. Being 50 foot above
the ground, approx 500 ft above sea level anyway. I think the deciding
factor is that there is nothing on top of the tower now anyway.

Thanks

73





"NM5K" wrote in message
...
On 3/9/2012 3:09 PM, Tuuk wrote:
Found it

Actually, I found some very old schematics , the paper is yellowish tea
like. Japanese I think . Hidaka.

http://www.hidaka.com/e-a_multi-v.html#VS-41W

I am pretty sure the one I have now is the VS-80KR.

I am going to clean it up and try it out. Don't know what will happen
when I put it on a 50 ft tower in these windy days. Will have to
calculate the length of gnd planes. I suspect they will be too long.

Any recommendations?


Not really, as the antenna in the picture seems to use
loaded/trapped radials. So you will need their assembly
specs if you have those and plan to use them.
Or maybe assemble them and try to tune them.
If elevated, any full size wire radials will need to be resonant.
If ground mounted, there is no need to tune radials laying on or in
the ground.