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Re: [TowerTalk] Modifying Comtek 4-square controller(relay unit) for a d

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Modifying Comtek 4-square controller(relay unit) for a different band?
From: Michael Tope <W4EF@dellroy.com>
Date: Thu, 18 Nov 2021 12:36:44 -0800
List-post: <mailto:towertalk@contesting.com>
Hi Mike,

I suspect the Comtek Hybrids look something like what is described here:

https://www.egloff.eu/index.php?option=com_content&view=article&id=4&Itemid=136&lang=en

If so, you'll need to change the L & C values accordingly to create a 90 deg phase shift at 28 MHz instead of at 14 MHz.

73, Mike W4EF...............

On 11/18/2021 10:51 AM, Mike VE9AA ve9aa@nbnet.nb.ca wrote:
To standardize my little vertical based antenna farm, I am wanting to buy an ACB-10 for 10m, but they are no longer available and I cannot find any other make/model of a 4-square system for 10m anywhere on planet Earth, so is it possible to buy a 20m Comtek relay unit and put it on 10m?

If so, what all is involved?

Anyone have any working knowledge of the outside relay boxes?  I presume it must be something to do with the toroids, but I've never had one apart, nor do I even have a schematic for the outdoor unit.

Thanks !

CU (all of a sudden!) in the next one.

Mike VE9AA
p.s.-my backup plan is just to build another K1WA/K8UR/K3LR/N6LF vertical dipole array.

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