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Re: VLF: EbNaut 8270.1, Thursday Mar 10

To: <[email protected]>
Subject: Re: VLF: EbNaut 8270.1, Thursday Mar 10
From: "Markus Vester" <[email protected]>
Date: Fri, 11 Mar 2016 10:18:53 +0100
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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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