[Lowfer] WM in EN90xn

[Michael Sapp]

Mike: OK thanks for the insight on your end. Sunrise enhancement was 
favorable for WM this AM

https://www.dropbox.com/s/1639xrn6vjntgtt/capt00637.jpg?dl=0

and fairly consistent but light signal present through 1400UTC.  A roaming 
noise signal starts up around 1352 UTC on top of WM.

https://www.dropbox.com/s/n2j15zqc4kebpck/capt00639.jpg?dl=0


So the new Type 75 binocular transformers appear to be working OK.  HP3865c 
measured about .03dB insertion loss per transformer on the bench at 
185.300kHz after backing out the jumper cable loss, although I'm not sure 
what confidence level to apply to that number....

Weather and other atmospheric noise sources as well as uncontrollable local 
noise all play a part on what can be heard on a given day. I'll run these 
antenna transformers for a year and see what happens long term....

73 Mike wa3tts





----- Original Message ----- 
From: "N8OOU" <n8oou at meekfarm.us>
To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Thursday, January 15, 2015 8:49 AM
Subject: Re: [Lowfer] WM in EN90xn


> Mike - TTS;
>
> I compared this capture to your snapshot on 12/7/14 which was your first 
> of the Wm beacon. As I remember, we had a snow cover over a good portion 
> of the country at that time.  The signals then were much more solid for 
> all, but the difference between Wm and the others was about the same as 
> last night.
>
> The random background noise from last night looks a little more blured and 
> not as sharp/bright as in December. The ARGO settings are the same, and 
> the time last night was about 4 hrs. earlier.
>
> I know this comparison is a little apples and oranges but I would conclude 
> you have reduced your background clutter.
>
> Thanks for listening and working to make improvements.
>
> Mike - OOU
>
> 73   de   N8OOU - Mike Meek
>
> On 01/15/2015 01:12 AM, Michael Sapp wrote:
>> Mike & All: I put the Type 75 binocular transformers back on my EWE 
>> antenna this afternoon. A radio check last nite confirmed I had no F/B 
>> ratio and way too much 120Hz harmonic noise at VLF. Apparently when I 
>> swapped the orginal transformers back in I inadvertently used the 
>> internal 1K ohm resistor to GND as  (zero ohm) GND connection, which 
>> destroyed the antenna pattern.  Seems to be OK now and the 4kHz HPF seems 
>> to help SNR somewhat below 20kHz....
>>
>> https://www.dropbox.com/s/gemwd7qw0ecviu3/capt00628.jpg?dl=0
>>
>> https://www.dropbox.com/s/y0dblhz52a33njr/capt00629.jpg?dl=0
>>
>>
>> Mni Tnx for the LF beaconing...73 Mike wa3tts
>>
>> PS: DCF77 booming in on 77.5 kHz this evening
>>
>> https://www.dropbox.com/s/deg9yp52lew2g2x/capt00624.jpg?dl=0
>>
>>
>>
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