Ward,
Congratulations on a great signal.
I can send plots from GA, KS, AK and PR if you’d like; it would be helpful to know when you’re on but also have ~ 1-week backup on those receivers.
73,
Jim AA5BW
From: [email protected] [mailto:[email protected]] On Behalf Of Ward K7PO
Sent: Friday, February 9, 2018 10:46 AM
To: [email protected]
Subject: Re: LF: K7PO testing 8270.0
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 <[email protected]>
To: rsgb_lf_group <[email protected]>
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
--
