[Lowfer] SIW wspr 15

[Michael Sapp]

Garry: Thanks, the results appear to be similar to the kind of WSPR15 SNRs 
from SIW  I had received last winter.  LF conditions may be a quieter than 
average for the 24 to 48 hours since the ionosphere gave up its energy  from 
the last X class flare and geomag swings.  I had good results from WH2XGP 
overnight on the same NW EWE antenna on the 630m band with 33 decodes and 
best signal level close to audible range at -14 SNR.  At this point I have 
to conclude I have not done any harm to the EWE antennas by raising them to 
the 25 to 30ft level for LF/MF reception.

I'm still toying with ARGO to figure out the correct offset for the 185.185 
QRSS mode....I started with 1610 Hz but changed to 1615Hz.  I have some flat 
line signals but not sure what they are at the moment in QRSS30 slow.  I may 
have to use QRSS60 to have long enough traces for visual IDs....

https://www.dropbox.com/s/q1mv8p5hz2swo0n/IMG_0758.JPG?dl=0

QRZ.com says path to NK9M is 700km. Plugging that and .185 MHz into the Free 
Space Path Loss equation yields 32.45 +20*Log(.185) + 20*Log(700) or about 
75 dB WSPR 15 reporting -37,  so -75 (+) - 37 is -112 signal level assuming 
SIW is 0 dBm radiated and if my thinkiing is not off base...(could be as I 
am not adding my rx antenna inefficiency---just assuming it is part of 
the -37 SNR).  I need to contemplate path loss order of magnitude for a 
bit....

By coincidence ARGO was showing quietest noise level around -74 in QRSS60 
earlier in the day with SIW 6 to 7 dB out of the noise.

73, Mike wa3tts





----- Original Message ----- 
From: "Garry" <k3siw at sbcglobal.net>
To: <lowfer at mailman.qth.net>
Sent: Thursday, September 14, 2017 4:17 PM
Subject: Re: [Lowfer] SIW wspr 15


> FB Mike, that's impressive to get a decode at 1pm my time from nearly 500 
> miles. Opera32 should be several dB more sensitive than wspr15 too but a 
> pain to run compared to QRSS60.
> -- 
> Garry, K3SIW, EN52ta, Elgin, IL
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