[Lowfer] Lowfer JH Loop Experiment

[N8OOU]

John,

I have used Mylar and polystyrene caps for determining the values needed 
to tune the loops. They seem to do ok, but after getting pfff's needed I 
have always put Mica HV caps and Air variables on the air.

I use a simple LED - Diode as an rf detector with one lead connected to 
a loop end. The other hanging in free air. Tune for max brightness.

I also put up this 2020 capture of JH. I was comparing the frequency 
from it to last night. Last night the noise level was a lot higher.

qsl.net/n8oou/JHbeaconJan152020.jpg

73   de   N8OOU - Mike Meek

On 11/30/21 9:11 AM, John Hamer wrote:
> 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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