The vactrol control voltage on the Wellbrook K9AY was fed via the coax.
feeder. Two separate wires were used to switch the loops and beam reversal
relays.
The rare Wellbrook K9AY Phased array used a fixed 360 Ohm termination
resistor. The pattern tweaking was done by varying the Phase/Amplitude.
73
Andrew Ikin
Wellbrook
-----Original Message-----
From: Chuck Hutton
Sent: Wednesday, September 16, 2015 4:52 AM
To: [email protected]
Subject: Re: [IRCA] 15 September TP/DU Victoria B.C. Canada
Colin & Craig -
Principles don't need to be similar - a Vactrol can terminate a Beverage,
DKAZ flag, loop, delta, etc.
Are you really using a flag or is it a corner fed loop?
And yes, the K9AY system uses a termination box with a Vactrol. The
Wellbrook version had several flavors, but the one I remember also used a
Vactrol but unlike most other schemes, DC was fed to the Vactrol via
separate wires rather than using the coax to carry DC. Can you be specific
about the version you have?
Chuck
Date: Tue, 15 Sep 2015 20:04:19 -0700
From: [email protected]
To: [email protected]
Subject: Re: [IRCA] 15 September TP/DU Victoria B.C. Canada
Entirely possible - but I am not an authority on the K9AY --
Principles are similar I think -
I am going to post an article on the subject and open up a discussion area
on the DXer.ca website.
Also looking for a sense if there would be a demand for separate hand-made
VACTROL units
that can be used be the deliciously simple FLAG antenna system/concept.
Subject: Re: [IRCA] 15 September TP/DU Victoria B.C. Canada
> I wonder if I can use the Wellbrook K9AY antenna unit, amp & controller
> for a multiple flag or EWE array. As I recall, the K9AY controller
> employs
> a vactrol for resistance adjustment. Any insights would be welcome.
>
> Craig Barnes
>
--
*Colin Newell is the Editor and creator of Coffeecrew.com
<http://www.Coffeecrew.com> - Coffee.bc.ca <http://Coffee.bc.ca> and
DXer.ca <http://www.DXer.ca> -| Amateur Radio VA7WWV |
Twitter.Com/CoffeeCrew | Victoria B.C. Canada*
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