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Author Topic: Looking for a 80m band solution.  (Read 14544 times)
LA9XNA
Member

Posts: 107




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« Reply #15 on: June 08, 2013, 01:10:57 PM »

To improve your ground system have your consideres to make a artificial ground?
http://www.remeeus.nl/english/hamradio/artificial_ground.htm
As you see it is a series-resonant tuned circuit with a current meter.
I buildt one myselves and did some testing with a MFJ-1622 and it where very simpel to get the antenna in resonance.

It might improve your CP.
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K1DA
Member

Posts: 500




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« Reply #16 on: June 15, 2013, 07:18:11 AM »

According to W8JI  (Google his site) an  endfed needs a floating counterpoise -- the "other side" of the antenna.  It does not have to be long, but if you don't have one your coax will
become part of the system and show "common mode" current.  A current balun is needed at the feedpoint.  It won't work like  a high dipole, but you'll  increase the amount of useful radiation from your system and have less in the shack.
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N3LCW
Member

Posts: 150




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« Reply #17 on: June 20, 2013, 06:31:44 AM »

Claudio,

I should have suggested this earlier.

http://www.w0uce.net/K2AVantennas.html

It is a very effective counterpoise solution for small yards such as ours.

Andy
N3LCW
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NO9E
Member

Posts: 403




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« Reply #18 on: June 28, 2013, 05:53:38 AM »

Lots of focus on ground resistance but little on surrounding structures.

My experience tells me that ground mounted verticals work well next to vinyl sided houses with asphalt shingles but poorly next to brick houses and with metal roofs. Virtually all houses in Italy are brick or stone. Then the best antenna would be the one over the obstructions. So inverted V on a 5m mast over the roof may be 10-15 db better than a hidden vertical. One choice is a dipole feed by ladderline or even TV line and a tuner. I used to have a 40m dipole just over the roof about 10m over the ground and fed with a ladderline. With MFJ 962C and 500W worked DX on 80m and coast to coast on 160m.


Ignacy, NO9E

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