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Guess this thread needs a new title...
It seems that the broad midday maximum appears
consistently on different medium-range VLF paths, also on
most 100 kHz Loran-C traces. Simplistic interpretation:
With higher solar elevation, ionisation penetrates to lower layers and
produces a steeper conductivity gradient, quite in analogy to a metal
mirror. However this would predict that midday reflection would be stronger in
summer?
Looking forward to Bob's test tomorrow!
Best 73,
Markus (DF6NM)
Sent: Friday, March 07, 2014 11:16 PM
Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial
Freq...
Markus,
I?m
glad that you suggested a 2-hour time slot (if it works for Bob). Based on your
NAA spectrogram (attached), the window that you?re shooting for may be a
multimode interference peak, which might be shifted (an hour or so?) for a Penn
Yan path; and I don?t know which direction in time the window would shift.
Paul
is doing so many things that I hate to mention this, but I wonder if LWPC would
show the interference peak near 1500 UT; and if so, which direction in time the
peak would shift for the Penn Yan path.
I
seem to remember that Paul provided an online interface to LWPC, I?ll see if I
can find it.
73,
Jim AA5BW
how about a straight
carrier on 29.499, from 14 to 16 UT? The narrow grabbers will be on even if
I have to be away. Results may depend on the qrn situation here (aka
Eu weather).
Sent: Friday, March 07,
2014 10:29 PM
Subject: RE: LF: New OPERA
OP/OPDS 2H tonight on 27.945 Dial
Freq...
Markus;
With you home
[not at work] tomorrow lets try around that 1500. I left the signal on two
nights ago till 1200 but after 0800 signal was gone till 2400 next night.
What mode and what time you want signal? Bob
From: [email protected]
To: [email protected]
Date:
Fri, 7 Mar 2014 21:45:19 +0100
Subject: Re: LF: New OPERA OP/OPDS 2H tonight
on 27.945 Dial Freq...
I would think that
the main difference between Todmorden and Nuernberg is that I'm into the sunrise
dip an hour earlier. And my noise background is higher, so I tend to completely
lose a weak signal which Paul would still receive well.
Anyway looking at the
attached NAA plot I'm sort of perplexed by the strong propagation
during the day. If Bob decided to transmit sometime around 15 UT, there's a good
chance we'd pick it up.
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