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Thanks a lot Paul, it's good to see your
reliable decodes.
The carrier data is helpful, and we can see
that some irregularity must have occured before 12 UT. Interestingly my
Loran-C monitor, which is also fed by the same GPS device (an old
Motorola 8-channel Oncore), lost lock twice around that time. I
may have to do further investigattions on GPS reception reliability during VLF
transmissions. I suspect the problem might have been a combination of RF
noise from occasional partial discharges and unfavourable satellite visibility.
All the best, and good
luck for your LF transmissions!
73, Markus (DF6NM)
Sent: Thursday, March 10, 2016 8:24 PM
Subject: Re: VLF: EbNaut 8270.1, Thursday Mar 10
Markus
wrote:
> Frequency: 8270.100 Hz,
> start time
09:20:02,
> 5 characters, 8K19A, 16 bit CRC, 10 second
symbols,
> total duration 5120 seconds,
> end time
10:45:22.
An easy decode Eb/N0 = 1.7 dB, BER 34.2% and the phase
pattern
was -30 -30 0 0. Carrier -55.8dB in 2.5kHz after sferic
blanking.
> The message will be repeated 13:00:02 to
14:25:22
Decoded with Eb/N0 = 0.0 dB, BER 36.9%, phase -30 -30 0
0,
carrier -56.2dB.
> Between the two EbNaut sequences (10:45
to 13 UT), I had
> sent a straight uninterrupted carrier on
8270.0025 Hz.
Flux density and phase in 30 minute 555uHz
averages
10:45 to 11:15 0.069 fT -70
deg
11:00 to 11:30 0.067 fT -53 deg
11:15
to 11:45 0.075 fT -71 deg
11:30 to 12:00 0.083
fT -107 deg
11:45 to 12:15 0.082 fT -115
deg
12:00 to 12:30 0.084 fT -71 deg
12:15
to 12:45 0.126 fT -65 deg
12:30 to 13:00 0.151
fT -72 deg
Flux density and phase in 15 minute 1.1mHz
averages
11:15 to 11:30 0.054 fT -43
deg
11:30 to 11:45 0.104 fT -87 deg
11:45
to 12:00 0.077 fT -138 deg
12:00 to 12:15 0.094
fT -95 deg
12:15 to 12:30 0.091 fT -51
deg
12:30 to 12:45 0.167 fT -71 deg
12:45
to 13:00 0.135 fT -74 deg
--
Paul
Nicholson,
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