Message-ID: <5C52F3F6.5080906@posteo.de>
Date: Thu, 31 Jan 2019 14:11:18 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: LF: VO1NA EbNaut
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Jay, Joe, LF,

Interesting. And thanks for reminding that Joe has been on the air. What 
were the parameters of the transmission? I can't find the message 
announcement...

73, Stefan


Am 31.01.2019 12:29, schrieb jrusgrove@comcast.net:
> Joe & EbNaut-eers
> Had not checked in on VO1NA LF EbNaut for some time so decided to have 
> a look. Immediately noticed the unusually large spread between car 
> Eb/N0 and Eb/N0. Inspection of the phase plots revealed the problem 
> ... there were two minute periods of 'disruption' on an otherwise 
> clean phase plots. By matching up the observed 'disruption' times with 
> the WSPR database I was able to determine the interfering signal was 
> WSPR and belonged to K3RWR (one of the strongest LF signals at this 
> location). Considering K3RWR's signal is outside the SpecLab FFT 
> bandwidth the problem is most likely happening at the receiver ... a 
> Cubic SMA-2400. AGC was turned on at the time to prevent audio 
> distortion from the stronger WSPR signals. When time permits I'll run 
> another test with AGC turned off.
> Last night's reception list:
> 0130 Rank 0 car Eb/N0 16.2 Eb/N0   8.9 *******
> 0200 Rank 0 car Eb/N0 20.1 Eb/N0 12.3 **VO1NA
> 0230 Rank 0 car Eb/N0 29.1 Eb/N0 15.3 *******
> 0300 Rank 0 car Eb/N0 27.9 Eb/N0 15.6 **VO1NA
> 0330 Rank 0 car Eb/N0 28.0 Eb/N0 13.3 *******
> 0400 Rank 0 car Eb/N0 28.7 Eb/N0 11.9 **VO1NA
> Phase plot below.
> Jay W1VD

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Jay, Joe, LF,<br>
<br>
Interesting. And thanks for reminding that Joe has been on the air.
What were the parameters of the transmission? I can't find the message
announcement... <br>
<br>
73, Stefan<br>
<br>
<br>
<br>
Am 31.01.2019 12:29, schrieb <a class="moz-txt-link-abbreviated" href="mailto:jrusgrove@comcast.net:">jrusgrove@comcast.net:</a>
<blockquote cite="mid:1UTCZw4Jzr.F7dZYpniNns@optiplex980-pc" type="cite">
  <style type="text/css"> body { margin:0.7em; } body.OECFntDef, body.OECFntDef div { font-family:Arial,"Segoe UI",Tahoma,Verdana,Helvetica,sans-serif;font-size:10pt; }</style>
  <meta name="GENERATOR" content="MSHTML 11.00.9600.18450">
  <div>Joe &amp; EbNaut-eers</div>
  <div> </div>
  <div>Had not checked in on VO1NA LF EbNaut for some time so decided
to have a look. Immediately noticed the unusually large spread between
car Eb/N0 and Eb/N0. Inspection of the phase plots revealed the problem
... there were two minute periods of 'disruption' on an otherwise clean
phase plots. By matching up the observed 'disruption' times with the
WSPR database I was able to determine the interfering signal was WSPR
and belonged to K3RWR (one of the strongest LF signals at this
location). Considering K3RWR's signal is outside the SpecLab FFT
bandwidth the problem is most likely happening at the receiver ... a
Cubic SMA-2400. AGC was turned on at the time to prevent audio
distortion from the stronger WSPR signals. When time permits I'll run
another test with AGC turned off.</div>
  <div> </div>
  <div>Last night's reception list:     </div>
  <div> </div>
  <div>0130 Rank 0 car Eb/N0 16.2 Eb/N0   8.9 *******</div>
  <div>
  <div>0200 Rank 0 car Eb/N0 20.1 Eb/N0 12.3 **VO1NA</div>
  <div>
  <div>0230 Rank 0 car Eb/N0 29.1 Eb/N0 15.3 *******</div>
  <div>0300 Rank 0 car Eb/N0 27.9 Eb/N0 15.6 **VO1NA</div>
  <div>0330 Rank 0 car Eb/N0 28.0 Eb/N0 13.3 *******</div>
  <div>0400 Rank 0 car Eb/N0 28.7 Eb/N0 11.9 **VO1NA</div>
  <div> </div>
  <div>Phase plot below.</div>
  <div> </div>
  <div><img alt="" src="cid:part1.09050506.07060009@posteo.de"
 align="baseline" border="0" hspace="0"></div>
  <div> </div>
  <div>Jay W1VD</div>
  </div>
  </div>
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