Date: Fri, 9 Feb 2018 10:45:55 -0500
From: Ward K7PO <wmwheaton@aim.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: K7PO testing 8270.0
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Paul,
I think you are correct on the GPS lock. I now recall a couple
occasions in the last few weeks where I noticed the GPS unlocked.
The problem must be worse than I thought. Tonight (~0100Z) I'll
go out and check the GPS system or swap it with a second GPS. Is
8270.0 good?

The TX is located some distance from me, so during the week I'm 
not there full time.

Ward

 
-----Original Message-----
From: Paul Nicholson <vlf0403@abelian.org>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Sent: Fri, Feb 9, 2018 8:00 am
Subject: Re: LF: K7PO testing 8270.0


Looking at the signal at Hawley in 1 hour chunks, S/N in 278 uHz
and phase:

  23 - 00 12.0 dB  -36.1 deg
  00 - 01 16.6 dB  185.5 deg
  01 - 02 18.1 dB   99.1 deg
  02 - 03 no signal
  03 - 04 no signal
  04 - 05 no signal
  05 - 06 16.1 dB   71.4 deg
  06 - 07 16.7 dB  108.8 deg
  07 - 08 no signal
  08 - 09 no signal
  09 - 10 no signal

When the signal is there, it is very strong and a sharp line on
frequency. Then it vanishes for a few hours. Perhaps shifted to
a frequency outside the narrow band I'm using?  Also the phase is
changing.    Those phase changes are causing the apparent spread
in the long narrow spectrum.

The pattern at Forest VA is similar but the signal is weaker so
harder to measure.

I'd guess, an intermittent GPS lock.  When it works, it works well,
a really good signal.

No sign of the signal here in Todmorden (8300 km), not much
chance until the tx is firmly locked, frequency and phase.  Then
there will be a good chance I think.

--
Paul Nicholson
--


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<font color='black' size='3' face='Comic Sans MS, sans-serif'>Pau<font size="3">l,<br>
I think you are correct on the GPS lock. I now recall a couple<br>
occasions in the last few weeks where I noticed the GPS unlocked.<br>
The problem must be worse than I thought. Tonight (~0100Z) I'll<br>
go out and check the GPS system or swap it with a second GPS. Is<br>
8270.0 good?<br>
<br>
</font><font size="3">The TX is located some distance from me, so during the week I'm <br>
</font><font size="3">not there full time.<br>
<br>
Ward<br>
</font>
<div> <br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Paul Nicholson &lt;vlf0403@abelian.org&gt;<br>
To: rsgb_lf_group &lt;rsgb_lf_group@blacksheep.org&gt;<br>
Sent: Fri, Feb 9, 2018 8:00 am<br>
Subject: Re: LF: K7PO testing 8270.0<br>
<br>
<br>
Looking at the signal at Hawley in 1 hour chunks, S/N in 278 uHz<br>
and phase:<br>
<br>
  23 - 00 12.0 dB  -36.1 deg<br>
  00 - 01 16.6 dB  185.5 deg<br>
  01 - 02 18.1 dB   99.1 deg<br>
  02 - 03 no signal<br>
  03 - 04 no signal<br>
  04 - 05 no signal<br>
  05 - 06 16.1 dB   71.4 deg<br>
  06 - 07 16.7 dB  108.8 deg<br>
  07 - 08 no signal<br>
  08 - 09 no signal<br>
  09 - 10 no signal<br>
<br>
When the signal is there, it is very strong and a sharp line on<br>
frequency. Then it vanishes for a few hours. Perhaps shifted to<br>
a frequency outside the narrow band I'm using?  Also the phase is<br>
changing.    Those phase changes are causing the apparent spread<br>
in the long narrow spectrum.<br>
<br>
The pattern at Forest VA is similar but the signal is weaker so<br>
harder to measure.<br>
<br>
I'd guess, an intermittent GPS lock.  When it works, it works well,<br>
a really good signal.<br>
<br>
No sign of the signal here in Todmorden (8300 km), not much<br>
chance until the tx is firmly locked, frequency and phase.  Then<br>
there will be a good chance I think.<br>
<br>
--<br>
Paul Nicholson<br>
--<br>
<br>
</div>
</font>
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