Steve,
I would bet your not expanding the coil far enough. Mine was expanded to the
point that the end of the coil itself was OUTSIDE the connection point! In
other words the distance from one connection point to the other was LESS
THAN the length of the coil! This is what it took for me. The ends are
bolted and I feel strongly that this is needed in order to maintain the Q of
the ckt.
Not to ask dumb questions but I am one that believes in not making
assumptions - you do have the hairpin at the bottom of the relay box and not
at the antenna correct? That of course would not cause infinite vswr but is
a valid question nonetheless. I am not sure of your description below - you
say hooking it up with the balun, relays, hairpin it does not work - but
hooking the balun up to the feedpoint works - huh?
g.
K9RX
----- Original Message -----
From: K7LXC@aol.com
To: towertalk@contesting.com ; Force12Talk@qth.com
Cc: RXDesign@ssvecnet.com
Sent: Sunday, March 04, 2007 8:09 AM
Subject: Force 12 Sigma 180 80M dipole
Howdy, TowerTalkians --
I'm installing one of these antennas and have run into a problem that
I need some input on. The antenna natural resonant frequency is 3.500, it
should be about 3.800. The manual is pretty ambiguous (nothing new there)
about the coils; it looks like the outer end connects to a thru-the-element
bolt. A similar one I installed was not fixed and used U-bolts to vary the
length of the coil along the element. It seems like we should try that on
this antenna. Gary, K9RX, has one and used the attachment to the thru-bolt
successfully so now I'm confused.
Also, when I have the relay box, hairpin coil and balun hooked up, I
get infinite SWR which is a typically a feedline problem. Hooking the balun
directly to the feedpoint works as it should. More confusion. :-(
TIA for any help.
Cheers,
Steve K7LXC
TOWER TECH
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