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Author Topic: Vertical multi band antenna.  (Read 759 times)

Offline sm5mek

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Vertical multi band antenna.
« on: June 20, 2015, 09:52:33 UTC »
Recently i did an vertical antenna with tunable coil with an slider outside the coil. I now have done an English text page about this See here8) :o ;D
Best regards, 72 de SM5MEK, Jenny.

Offline ON6KZ

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Re: Vertical multi band antenna.
« Reply #1 on: July 21, 2015, 08:57:41 UTC »
Interesting project. What is the performance?

Offline sm5mek

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Re: Vertical multi band antenna.
« Reply #2 on: July 21, 2015, 09:57:56 UTC »
It works well, but conds here realy poor, tested via RBN and not at all the same signals i use to have from any of my systems. The coil could be with less turns, maybee 70n to this 3m telescopic rod. Smaller rod vill have more turns on coil. At 40 m i am on the middle of the coil, but it works good. Easy to tune for low  (almost no) SWR with the slider and dont need any tuner. For higher bands, above 20m i have to tune with the telescopic rod first and fine tune vith coil.. ground plane just some meter of one wire if any ground needs at all.
I am now ready with this antenna, see whole description on my homepage. one bottom tube above is the coil and above coil is the telescopic rod. I can chose between 170 cm rod and 300cm rod. I also use one unun 1:1 and two counterpoises. This give me good values on SWR and also my ref. stn. on 80 m heard me weak but there was nothing in the beginning and conds very bad last week.
Best regards, 72 de SM5MEK, Jenny.

Offline sm5mek

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Re: Vertical multi band antenna.
« Reply #3 on: September 13, 2015, 11:11:01 UTC »
Dont realy know yet, the conds here make the bands almost impossible. I have done one qrpp qso this month so far. I will report when having anything interesting to say about it.
Best regards, 72 de SM5MEK, Jenny.