[TowerTalk] OT - Tri-band Coupled Resonator Antenna Design

[Clay Autery]

Hey Jim....  Forget the GP-15...  That's not why I started this thread...

This particular 6m/2m/70cm triband vertical dipole is intended for
MOSTLY repeater use on ALL THREE bands here locally.... Sep antenna for
the 6m Motorola, 2m/70cm radio, etc....  I'm designing it so that it has
a nominal 50 Ohm impedance and low SWR in the desired bandwidth so the
non-tuner radios will work well.
I will be able to access it via the K3s for 6m/2m if required...
anywhere on the band should be able to tune "OK" with the K3's onboard ATU.

Question:  Would you have a favorite 1:1 choke design for placement at
the feedpoint?  And I'm probably going to put another one at the 6m 1/4
wave point just for good measure.

73,

______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 6/3/2017 11:46 AM, Jim Brown wrote:
> Several thoughts. First, the fact that it's tuned to 52 MHz with a 2:1
> SWR bandwidth of 1 MHz and that it's vertically polarized tells me
> that it's designed for FM repeater operation. Nothing wrong with that,
> but it wouldn't be my first choice to work CW, SSB, and digital
> modes.  Also nothing wrong with omnis -- while in Chicago, I had a lot
> of fun with pairs of stacked PAR loops for 6, 2, and 440, and worked a
> lot of grids on 6M. I worked a lot of grids that were in the opposite
> direction from where I would have pointed a beam if I had one (and I
> later did). I also worked AU on both 6 and 2.
>
> As to "works good" -- the path from Gene's QTH to Harrington, DE goes
> over mostly flat land and a lot of water. Could it be that tropo has a
> lot to do with working that repeater?
>
> 73, Jim K9YC
>