[Lowfer] Lowfer JH Loop Experiment

[John Hamer]

Mike,

Thanks for looking last night. There is definitely something there. It's
hard to tell if there is a JH in there, but it definitely looks like it
could be.

I am using some met poly capacitors I had right now for tuning the loop,
but I have some mica's on order. I also have a 900pF tuning cap for fine
tuning. Do you have any experience with Met Poly caps with something like
this? They claim to be pretty stable. Something is changing after the
transmitter cuts on. I am tuning the antenna using a nanoVNA. The current
on my final looks exactly correct for the 50Ohm load every time the
transmission starts, but over the next 30 seconds to 1 min the current
slowly drops. I'm not sure if the capacitors are warming and changing value
or if there is just a connection issue with them in a breadboard. I will
remove one of those possibilities when I solder everything together, but it
kinda looks like it's just coming out of tune. I also need to build
something to measure antenna current. I should have it all next week
sometime.

Finals are staying cool and frequency is stable.

The link below has some pictures.
http://jwhamer.me/lowferJH/Loop2021/

John Hamer

On Tue, Nov 30, 2021 at 7:55 AM N8OOU <n8oou at meekfarm.us> wrote:

> John,
>
> Thanks for the info, I can relate your results to the tests I made using
> Quad Shield RG6 and RG8.
>
> I shut down WM to listen overnight. Nothing seen until Gray Line this
> morning. See the first capture at;
> http://qsl.net/n8oou/nov29210006.jpg
>
> I have a second screen comming, it looks like you went qrt at 06:30 CST.
> The filename will be nov29210007.jpg when it's ready.
>
> 73   de   N8OOU - Mike Meek
>
> On 11/29/21 8:58 PM, John Hamer wrote:
> > Mike,
> >
> > I actually have some pretty good size litz wire. It looks to be around 3
> or
> > 4mm diameter.  Ill see if there is a label on spool with more
> information.
> > I'm not sure if the spool came with the wire.  I got it from my last job
> > years ago when they were trashing it.
> >
> > I still have everything breadboarded, so I'm not sure if that is causing
> > any issues,  but I will solder it all together in the next few days
> >
> > John
> >
> >
> > On Mon, Nov 29, 2021, 9:52 PM N8OOU <n8oou at meekfarm.us> wrote:
> >
> >> John,
> >>
> >> Good to have another loop experimenter. I am curious about what you are
> >> using for the loop conductor. My experiments have shown the larger the
> >> conductor, the better.
> >>
> >> Good Luck
> >>
> >> 73   de   N8OOU - Mike Meek
> >>
> >> On 11/29/21 5:17 PM, John Hamer wrote:
> >>> I have a 12'x12' square loop setup. I am transmitting my usual mode of
> >>> qrss60 and a graphic on 181.818KHz. I just got it going tonight and
> still
> >>> have some work to do, but if you are looking for a challenge, give it a
> >>> shot! It is aimed in the N/S direction.
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