[Lowfer] WM and SIW this AM~PM

[Michael Sapp]

Mike (OOU): We were thinking alike as I made the additional captures of WM 
but got side-tracked as I went up to 188.83 to copy EAR for a bit and was 
actually hearing the EAR QRSS audibly although it was a very weak 500 Hz 
tone. Was trying to discern the QRSS tone versus the other  low beat note 
and higher 1~2 kHz range note in the receiver bandpass.

Anyway here are the two afternoon post change WM captures....slightly higher 
in frequency as you noted.

https://www.dropbox.com/s/5f7skn5tp3vj1jo/capt00018.jpg?dl=0

https://www.dropbox.com/s/qpykcazd143sh29/capt00019.jpg?dl=0


I'm leaning towards having some receive performance improvement here with 
the filter-amplifier-filter-mixer configuration.  Especially having heard 
EAR audibly for the first time.
EAR has a very stable ground wave signal here, so it makes for a good 
"standard candle" signal reference...

WM doing nicely at twice the distance is impressive as well.

73, Mike wa3tts

----- Original Message ----- 
From: "N8OOU" <n8oou at meekfarm.us>
To: <lowfer at mailman.qth.net>
Sent: Monday, December 11, 2017 4:03 PM
Subject: Re: [Lowfer] WM and SIW this AM~PM


> Mike - tts;
>
> Are you still able to copy the modified WM id after the 19:00 utc restart? 
> Raising the frequency did slightly drop the PA Input power from .99W to 
> .96W.  After going back and checking the antenna tuning it seemed to be in 
> resonance.
>
> Thanks for the reports.
>
> 73   de   N8OOU - Mike Meek
>
> On 12/11/2017 01:30 PM, Michael Sapp wrote:
>> Mike: I'm guessing you turned off WM momentarily about 1850 utc as I saw 
>> it stop about then. Captures from mid morning in QRSS60 normal mode 
>> below. Made on my NW EWE antenna which is pointed almost directly at SIW. 
>> I would think the side of the cardio pattern would put WM down about 1.5 
>> to 2 dB. SIW stopped at 1809, I assume that was the switch to 185.185.
>>
>> https://www.dropbox.com/s/dc7csmvwzf8dkj5/capt00014.jpg?dl=0
>>
>> https://www.dropbox.com/s/shymmgqahttsts6/capt00015.jpg?dl=0
>>
>> https://www.dropbox.com/s/chclkxlzde9rt7i/capt00016.jpg?dl=0
>>
>> https://www.dropbox.com/s/n3rt5bkl6sfjjzw/capt00017.jpg?dl=0
>>
>> I looked at the GEOS geomag plot and we did have a geomagnetic "jerk" 
>> from the normal sinusoidal pattern the past 12 hours. I also made a rx 
>> system change
>> placing my 9th order Butterworth 300kHz LPF between my 2N5109 W1VD design 
>> preamp output and the RAY6 Mini Circuits Level 23 Mixer, and a 5th order 
>> Butterworth LPF with a shunt notch at mid-AM band at the preamp input. 
>> The 9th order Butterworth LPF has really excellent return loss 
>> performance, so it may help the match and IMD performance of the mixer 
>> versus the preamp going directly to the mixer.
>>
>> I did a similar thing on 137 kHz overnight and logged 34 WA9CGZ decodes 
>> on 2200m wspr2, whereas previously I could only log a half-dozen or so 
>> CGZ decodes overnight. Could be propagation effects as well, so it will 
>> take a few weeks of observing to sort out if any real improvement is 
>> being made---or just cooler weather lowering the atmospheric noise as the 
>> dominant cause of the improved reception...
>>
>> Tnx again for the beaconing efforts
>>
>> 73, Mike wa3tts
>>
>>
>>
>>
>>
>>
>>
>> ----- Original Message ----- From: "N8OOU" <n8oou at meekfarm.us>
>> To: "lowferlist" <lowfer at mailman.qth.net>
>> Sent: Monday, December 11, 2017 2:03 PM
>> Subject: [Lowfer] WM Lowfer test
>>
>>
>>> All;
>>>
>>> I made a small change in the WM Lowfer this afternoon. In support of a 
>>> special test request I have changes the ID Format to a FSKCW QRSS - 60 
>>> mode, as well as increased the transmission frequency by 1 Hz.  This is 
>>> a temporary change to measure the ground wave coverage of the beacon.
>>>
>>> I will change the beacon back to it's normal mode and freq after dusk 
>>> here.
>>>
>>> Reports Welcome
>>>
>>> -- 
>>> 73 de N8OOU - Mike Meek
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>>
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