[Lowfer] SIW in EN90xn + WM??

[Michael Sapp]

OK Mike: Your WM beacon seemed to settle down around 0245 ~ 0300.   Looks 
like SJ is the one in need of some photonic Xanax with it's ongoing 
stability issues ~:)

https://www.dropbox.com/s/j2qkjuq0wrq3j07/capt00046.jpg?dl=0


Crunch some numbers with the free space path loss equation or just look at 
the 20Log(Fmhz) component.   20Log(1.853MHz) = +5.357~

and 20Log(.1853) = -14.642~ so the free space path loss is 20dB less at the 
lowfer watering hole (.1853Mhz) vs 1.853MHz in the 160m band.

Of course it is much more difficult to erect a 1/4wave vertical @ 185 kHz.

A big daylight improvement here was building a new 9th order Butterworth LPF 
with a 300kHz cut off freq, which gives me 40dB of attenuation at 500kHz

and essentially scrubs all the overload energy from the AM BCB.   At night 
the issue is not so apparent because many of the local AM stations power 
down for night time

broadcasting.  But in daylight, being able to scrub all that full power, 
local, AM BCB energy makes a noticeable difference for watering hole 
monitoring.  One more layer of the "noise onion" envelope solved and a few 
more to go.....

https://www.dropbox.com/s/db3vjk79c5hvuju/300KBUTLP.jpg?dl=0

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 08, 2015 10:52 PM
Subject: Re: [Lowfer] SIW in EN90xn + WM??


> Thanks Mike for the added screen shots. As much as I would like to leave 
> the beacon up tonight, I am finding the spurs are fairly strong locally. 
> so it is going back down for the night.  The loss of the signal last month 
> was due to a component failure in the LP filter. I must still have 
> something out of tolerance.
>
> I had no idea before putting this beacon up, how extensive the LF ground 
> coverage is, with such low power. It's amazing to me that you and Ben, and 
> others have seen the Wm signal in the daytime.
>
> Thanks again.  Mike - OOU
>
> 73   de   N8OOU - Mike Meek
>
> On 01/08/2015 07:41 PM, Michael Sapp wrote:
>> Mike: I think that is our first daylight reception, prior captures have
>> all been late nite / early morning in 0800~1000 utc zone.  Best capture
>> this afternoon is below
>>
>> https://www.dropbox.com/s/abbc8fs8vogdj5e/capt00035.jpg?dl=0
>>
>> very clean pattern for that time interval.  Most recent view of watering
>> hole is below. If past experience holds up your signal should peak here
>> in the early morning.  In this +400 mile path it seems to be a bit too
>> close for good-consistent skywave and on the edge of groundwave range
>> from the past 2~3 years I have been chasing LF signals....
>>
>> https://www.dropbox.com/s/obvbr6gjvrf8yd5/capt00042.jpg?dl=0
>>
>> 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 08, 2015 7:22 PM
>> Subject: Re: [Lowfer] SIW in EN90xn + WM??
>>
>>
>>> Mike, Thanks for the shot of Wm.  I have had it up today so I could
>>> take some readings after re-configuring things a little. I seem to
>>> have some spurs, so it's not ready for prime time. It's encouraging to
>>> me to see that you have some signal in the daytime. I don't have a
>>> snow cover, but things are sure frozen around here.
>>>
>>> Mike - OOU
>>>
>>> 73   de   N8OOU - Mike Meek
>>>
>>> On 01/08/2015 02:41 PM, Michael Sapp wrote:
>>>> Garry: Your SIW signal fairly robust at the 1800UTC switch over time.
>>>> Looks like possibly a WM sighting as well
>>>>
>>>> https://www.dropbox.com/s/hb9bqadl1i79n18/capt00032.jpg?dl=0
>>>>
>>>> https://www.dropbox.com/s/vsqg6dlm4jo7u8m/capt00033.jpg?dl=0
>>>>
>>>> Perhaps it takes a day or two for the trees to freeze and lower the
>>>> signal absorption.....no sudden solar events other than a minor C class
>>>> flare last hour or so....
>>>>
>>>> 73 Mike wa3tts
>>>>
>>>>
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