There is a reason DX Engineering/Comtek does not sell Comtek 4 square boxes
above 14 MHz. The inductor and capacitor values are very low and losses can be
a real problem. We are still trying - but it is not as easy as dividing down
the values. Believe me - we tried.
73
Tim K3LR @ DX Engineering
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Michael
Tope
Sent: Thursday, November 18, 2021 3:37 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Modifying Comtek 4-square controller(relay unit) for a
different band?
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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