RE: LF: Daytime 29.499 kHz

["hvanesce" <hvanesce@comcast.net>]

Dumb question but just in case: was the quick phase change of 120 degrees
corrected prior to integration?

Jim AA5BW  

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson
Sent: Sunday, March 9, 2014 5:56 AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Daytime 29.499 kHz

I think the propagation at 29.5 has changed, even though NAA looks normal at
24kHz.

There's a new pattern to the phase change: a fairly rapid reduction of phase
lead by about 120 deg during
the first 2 hours.   Minimum phase at about 03:00 instead
of 04:00 and after that a slow phase increase.

Last night:

  http://abelian.org/vlf/tmp/29499_140309a.gif

Previous night:

  http://abelian.org/vlf/tmp/29499_140308a.gif

Two nights in a row we got that 120 phase shift in
2 hours.   Other possibility is the loading coil tuning
is changing as it warms up from a cold start.

Signal last night from Dex on 29501 was also weaker than the other day

  http://abelian.org/vlf/tmp/29501_140309a.gif

These opera transmissions might be a bit weaker than the Morse anyway
because the duty cycle is less ??

Signal on 29499 declined during the night, NAA increased a little.
--
Paul Nicholson
--