Re: [IRCA] Remote Termination on DKAZ and EWE

[Neil Kazaross <neilkaz58@xxxxxxxxx>]

Yeah, I think you're right Nick about Vactrol and EWE. Also didn't
Wellbrook's K9AY unit use a Vactrol or some of the other commercial ones?

73 KAZ

On Sun, Mar 20, 2016 at 12:40 PM, Nick Hall-Patch <nhp@xxxxxxxx> wrote:

> Hi James,
>
> Haven't seen a reply on this, so don't know if you had already planned the
> transformer / lamp cord / potentiometer option.  (a version is at
> http://www.bamlog.com/vartermloop.htm).   If so, and you want to recover
> from the 5k pot purchase, and have some fixed resistors in the 1.2 - 1.8
> kilohm around, I can send you a diagram that should fill the bill.
>
> As far as the Vactrol and the EWE, I've seen a couple of references saying
> that won't work, but am not sure I understand why not.   It won't work with
> Mark Connelly's clever arrangement with Flag antennas where the control
> voltage is fed via the receiver feedline, and then through the Flag itself,
> but many people (including Colin Newell) are now using a separate control
> line (such as lamp cord).  In that case, I would think there should be no
> problem using a Vactrol with a EWE antenna, as the "resistor" in the
> Vactrol is completely isolated from the control line.
>
> best wishes,
>
> Nick
>
>
>
>
>
> At 00:35 20-03-16, you wrote:
>
>> James,
>>
>> Assuming that I understand your plans correctly you're planning on using
>> the pot in the shack with lamp cord running from it to the DKAZ. The
>> problem here is that the two wire cord will become part of the antenna and
>> screw up the pattern and null. To do what you plan to do, you need a
>> transformer at the end of the antenna to start with.
>>
>> Colin Newell of IRCA is making a selling Vactrol setups for a very fair
>> price. http://www.dxer.ca/
>>
>> Perhaps if you ask him, he could make one for you if you want to use your
>> lamp cord rather than cable to power it.
>>
>> After installing a Vactrol setup here, made for me by a good DX friend I
>> feel strongly that this is the way to go for remote control of Rt. My
>> fixed
>> resistor Rt was set to be very good via much trial and error. However, the
>> Vactrol is every bit as good as the fixed Rt on all freqs and I can
>> usually
>> tweak in a few more dB of null on a station and not hurt the null of other
>> stations. It is also useful to adjust Rt in some cases for improving nulls
>> of stuff at large angles to the exact back end or to improve nulls high
>> end
>> or low end.
>>
>> You won't be able to use this type of setup with a EWE since it is
>> connected to ground, but there are ways around that. However, I am not a
>> circuits guy so I am unsure how to do that.
>>
>> I'd use a Vactrol if you want to remotely vary Rt.   73 KAZ out to test
>> this setup at night.
>>
>> On Sat, Mar 19, 2016 at 2:36 PM, James Niven <jniven@xxxxxxxxxxxxx>
>> wrote:
>>
>> > Hi all,
>> >
>> >
>> >
>> > A General question...
>> >
>> >
>> >
>> > I think it's time to try out setting up remote termination on my DKAZ
>> and
>> > EWE.
>> >
>> > I have some lamp cable which I can run the length of my dkaz 140 foot to
>> > the
>> > DX shack.
>> >
>> >
>> >
>> > I thought I picked up 1k pots from radio shack, but I see I have 5k
>> > instead,
>> > will a 5K Linear-Taper Pot work or do I need something smaller?
>> >
>> > Also, this pot I have has three solder lugs, which lugs do I use to fix
>> the
>> > wire end on?
>> >
>> >
>> >
>> > James Niven
>> >
>> > Austin, Texas
>> >
>> >
>> >
>> >
>> >
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