My way to "get rid" of the capacitor was to alter the length of the elements.
By making them slightly longer you introduce a capacitance at the feeding point.
I never liked to have a capacitor in the open as they will be affected by
weather-and-wind.
Hans - N2JFS
-----Original Message-----
From: Rudy Bakalov <r_bakalov@yahoo.com>
To: Hans Hammarquist <hanslg@aol.com>
Sent: Wed, Jun 3, 2015 8:02 am
Subject: Re: [TowerTalk] Multiple HB9CV on a shared boom
Hi Hans,
Thanks for your email. It's good to know that others are experimenting with
this type of antenna. I have very fond memories with this antenna from way back
in the 80's in Bulgaria when we built tons of them and they consistently
demonstrated killer performance.
Strangely, we didn't use a capacitor in the feed system. Tell me a bit more-
what kind do I need to run legal limit? I size all my stuff for 5KW as I am a
RTTY contester and absolutely want to make sure components can take the heat.
Rudy N2WQ
Sent using a tiny keyboard. Please excuse brevity, typos, or inappropriate
autocorrect.
On Jun 2, 2015, at 11:49 AM, Hans Hammarquist < hanslg@aol.com> wrote:
Hi Rudy,
I have no experience with your suggested multiband HB9CV but I built several
single band versions. I am very interested how this will work out for you as
the HB9CV, to me, appears to be the best gain/material factor antenna. i never
even thought of a multiband version.
My first thought,reading your mail, is that you should not use regular coax
cables for the phasing line as the dielectric will change the phase angle,
something that might be detrimental to the gain and F/B ratio. It might not
even be necessary to shield the different phase line from each other.
Please keep me posted.
Best 73 de
Hans - N2JFS
-----Original Message-----
From: Rudy Bakalov via TowerTalk < towertalk@contesting.com>
To: Tower Talk < towertalk@contesting.com>
Sent: Tue, Jun 2, 2015 9:06 am
Subject: [TowerTalk] Multiple HB9CV on a shared boom
I was wondering if anyone has experience with building a 3 band HB9CV on a
shared boom. Basically, 3 separate antennas nested into each other- 20m, 15m,
and 10m. My thought is to use coax for the phasing lines and a non-conductive
boom so that there is no feed/phase line interference.
The antenna will be
fixed and suspended by ropes so the non-conductive boom is not a structural
issue.
Thoughts?
Rudy N2WQ
Sent using a tiny keyboard. Please excuse
brevity, typos, or inappropriate
autocorrect.
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