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To: rsgb_lf_group@blacksheep.org
References: <159a4661096-4946-10800@webprd-a16.mail.aol.com>
From: Paul Nicholson <vlf0403@abelian.org>
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Date: Sat, 28 Jan 2017 08:11:33 +0000
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Subject: Re: VLF: Back on 5.17 kHz / 58 km...
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Stefan wrote (12th Jan):
> f = 5170.000000 Hz
> Start time: 13.Jan.2017 08:00:00 UTC (daily repetition)
> Symbol period: 6 s
> Characters: 100 (!)
> CRC bits: 8
> Coding 8K19A
> Duration: 8h, 20m, 48s
> Antenna current: ~ 225 mA
Decoded via DL4YHF at Bielefeld (303.8 km):
'VERY LONG MESSAGES CAN BE SENT BY RADIO AMATEURS ON VLF USING
EBNAUT SOFTWARE. 73 DE DK7FC IN JN49IK'
Each day:
2017-01-13 -7.9 dB 138.6 deg S/N -59.1 dB
2017-01-14 -4.5 dB 136.0 deg S/N -55.7 dB
2017-01-15 -28.4 dB N/A S/N -79.6 dB
2017-01-16 -8.0 dB 138.7 deg S/N -59.2 dB
2017-01-17 -6.4 dB 144.9 deg S/N -57.6 dB
2017-01-18 -7.1 dB 146.1 deg S/N -58.3 dB
5 days stacked (excluding 15th):
Decoded with 0.2 dB 140.3 deg S/N -51.0 dB
Some combinations of 4 days also decode at -0.4 dB.
At Todmorden (881.2km):
2017-01-13 -11.1 dB 44.5 deg S/N -62.2 dB
2017-01-14 -12.1 dB 35.3 deg S/N -63.3 dB
2017-01-15 -37.0 dB N/A S/N -88.2 dB
2017-01-16 -14.0 dB 22.3 deg S/N -65.2 dB
2017-01-17 -13.5 dB 26.6 deg S/N -64.7 dB
2017-01-18 -14.0 dB 41.6 deg S/N -65.2 dB
5 days stacked (excluding 15th):
-4.8 dB 36.7 deg S/N -56.0 dB
Would probably need altogether at least 20 days to get
enough signal to decode at Todmorden.
> The todays [15th] transmission failed again for some reason
> :-( No idea what the reason could be.
> It stopped 15:46 UTC, about 3/4 hours to early.
From the S/N it looks like it had more effect, perhaps the
phase went wrong earlier in the transmission before it stopped.
--
Paul Nicholson
--