To: | rsgb_lf_group@blacksheep.org |
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Subject: | Re: LF: More EbNaut 137.777 - TA slot |
From: | Paul Nicholson <vlf0403@abelian.org> |
Date: | Sun, 06 Dec 2015 23:25:18 +0000 |
In-reply-to: | <Pine.LNX.4.64.1512061416550.8021@plato.ucs.mun.ca> |
References: | <5662352D.6050609@abelian.org> <8D2FD5A5840B109-1CBC-D5B38@webmail-vd007.sysops.aol.com> <5662CC47.3030007@abelian.org> <Pine.LNX.4.64.1512050917330.3615@plato.ucs.mun.ca> <5662FD4F.50104@abelian.org> <566305CF.4020407@abelian.org> <56631F93.7040505@abelian.org> <5663384D.9080401@abelian.org> <Pine.LNX.4.64.1512051609150.4700@plato.ucs.mun.ca> <56636B7C.8000608@abelian.org> <5663E8A8.7090205@abelian.org> <Pine.LNX.4.64.1512061416550.8021@plato.ucs.mun.ca> |
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It was a few hours before I got to the rx to retrieve the battery so it continued on an almost dead battery and recorded two more messages. VO1NA 2015-12-05/06 16K21A 5S 5C QRO start Eb/N0 Freq 13:30 13.0 -222 uHz 15:00 3.1 -256 uHz 16:30 3.9 -482 uHz 18:00 15.1 -558 uHz 19:30 17.3 -228 uHz 21:00 14.2 -330 uHz 22:30 18.7 -262 uHz 00:00 14.8 -253 uHz 01:30 17.0 -293 uHz 03:00 22.4 -41 uHz 04:30 20.8 -208 uHz 06:00 13.0 -216 uHz 07:30 17.0 -276 uHz 09:00 3.1 +20 uHz Partial reception at 10:30 gave enough to measure +3 uHz. I was able to measure the phase over the entire 21 hour recording in 5 minute averages: http://abelian.org/vlf/tmp/151206a.gif This looks to me like propagation, not drift of the tx oscillator. It's a pretty typical diurnal. I'm plotting phase measured at a frequency offset of -255 uHz. I think that Joe's oscillator is actually doing very well and we are seeing mostly the effect of propagation. The phase ends up nearly where it started and the total day/night change is about -1250 degrees or about -3.5 cycles. -- Paul Nicholson -- |
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