From: "jrusgrove@comcast.net" <jrusgrove@comcast.net>
To: "(rsgb_lf_group@blacksheep.org)" <rsgb_lf_group@blacksheep.org>
MIME-Version: 1.0
Date: Thu, 31 Jan 2019 06:29:24 -0500
Message-ID: <1UTCZw4Jzr.F7dZYpniNns@optiplex980-pc>
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Subject: LF: VO1NA EbNaut
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Joe & EbNaut-eers

Had not checked in on VO1NA LF EbNaut for some time so decided to have=
 a look.=20
Immediately noticed the unusually large spread between car Eb/N0 and E=
b/N0.=20
Inspection of the phase plots revealed the problem ... there were two =
minute=20
periods of 'disruption' on an otherwise clean phase plots. By matching=
 up the=20
observed 'disruption' times with the WSPR database I was able to deter=
mine the=20
interfering signal was WSPR and belonged to K3RWR (one of the stronges=
t LF=20
signals at this location). Considering=20
K3RWR's signal is outside the SpecLab FFT bandwidth the problem is mos=
t likely happening at the receiver ... a Cubic SMA-2400. AGC was turne=
d on at the time to prevent audio distortion from the stronger WSPR si=
gnals. When time permits I'll=20
run another test with AGC turned off.

Last night's reception list:    =20

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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<HTML><HEAD>
<STYLE type=3Dtext/css> body { margin:0.7em; } body.OECFntDef, body.OE=
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<DIV>Joe &amp; EbNaut-eers</DIV>
<DIV>&nbsp;</DIV>
<DIV>Had not checked in on VO1NA LF EbNaut for some time so decided to=
 have a look.&nbsp;Immediately noticed the unusually&nbsp;large spread=
 between car Eb/N0 and Eb/N0. Inspection of the phase plots revealed t=
he problem ... there were two minute periods of 'disruption'&nbsp;on&n=
bsp;an otherwise clean phase plots. By matching up the observed 'disru=
ption' times with the WSPR database I was able to determine the&nbsp;i=
nterfering signal was WSPR and belonged to K3RWR (one of the strongest=
 LF signals at this location).&nbsp;Considering&nbsp;K3RWR's signal is=
&nbsp;outside the SpecLab FFT bandwidth&nbsp;the problem&nbsp;is most&=
nbsp;likely happening at the receiver ... a Cubic SMA-2400.&nbsp;AGC w=
as turned on at the time&nbsp;to prevent audio distortion from the str=
onger&nbsp;WSPR signals. When time permits I'll run another test with =
AGC turned off.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Last night's reception list:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>0130 Rank 0 car Eb/N0 16.2 Eb/N0&nbsp;&nbsp; 8.9 *******</DIV>
<DIV>
<DIV>0200 Rank 0 car Eb/N0 20.1 Eb/N0&nbsp;12.3 **VO1NA</DIV>
<DIV>
<DIV>0230 Rank 0 car Eb/N0&nbsp;29.1 Eb/N0 15.3 *******</DIV>
<DIV>0300 Rank 0 car Eb/N0 27.9 Eb/N0&nbsp;15.6 **VO1NA</DIV>
<DIV>0330 Rank 0 car Eb/N0&nbsp;28.0 Eb/N0 13.3 *******</DIV>
<DIV>0400 Rank 0 car Eb/N0 28.7 Eb/N0&nbsp;11.9 **VO1NA</DIV>
<DIV>&nbsp;</DIV>
<DIV>Phase plot below.</DIV>
<DIV>&nbsp;</DIV>
<DIV><IMG border=3D0 hspace=3D0 alt=3D"" src=3D"cid:1UTCZw4Jzr.GDxcDgq=
XUEl@optiplex980-pc" align=3Dbaseline></DIV>
<DIV>&nbsp;</DIV>
<DIV>Jay W1VD</DIV></DIV></DIV></BODY></HTML>

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