Fw: [TowerTalk] Telrex Balun

[Greg Gobleman]

Dang, meant to send to the group!

----- Original Message -----
From: "Greg Gobleman" <k9zm@frontiernet.net>
To: "Pete Smith" <n4zr@contesting.com>
Sent: Thursday, July 13, 2000 8:40 PM
Subject: Re: [TowerTalk] Telrex Balun


>
> > Exactly - or an Autek RF-1.  How was the coil connected relative to the
> > coax -- could they have been trying to cancel out the capacitance of the
> > coax?
> >
> > 73, Pete Smith N4ZR
> >
> Ok, went out and got the critter.  The input side, you split the coax with
> something like 6" pigtails.  The center conductor goes thru about 8 turns
of
> RG8 and to one of the output terminals where it joins with one end of this
> 14-16ga coil.  The shield goes to the other input side, in the box it
joins
> with one end of the 14-16ga coil of 12 turns of insulated wire (the other
> end of which goes to the center conductor output) and also joins with a
lead
> going to the mount to the boom.  The shield makes it's path thru the coax
> and to its output.  The RG8 coil is at most 3.5" across and half the turns
> are inside the other half.  The coil is at most 1.75" across and nests
> inside the coil of coax.  From the output terminals there are straps to
the
> feedpoints on the driven element where the hairpin also attaches and the
> straps are about 8" long.
>
> Hope I didn't confuse anybody.  I really don't know all the theory and I
> don't know just how effective this may have been.  Fact is, they
> don't build them like that anymore.  However, this antenna has compared
> favorably against the largest tri-banders.  At least if memory serves, it
> did make a few of the tests done out west by some knowledgeable folks.
> Compared favorably or did well, compared to the KT34XA and the TH6/TH7, I
> think.  This from an antenna with 4 active elements on 10m, 3 active
> elements on 15m and 3 active on 20m.  I don't know what balun they used.
> And if the reports were as fair as possible, then either the TB6EM did
very
> well or the larger tri-banders don't do so well.
>
> 73
> Greg K9ZM
>
>


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