Message-ID: <27597093.980016302055.JavaMail.imail@chilly.excite.com>
Date: Sat, 20 Jan 2001 10:44:47 -0800 (PST)
From: "john sexton" <computernetworks@excite.com>
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: Larry's transmissions
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Hi Larry watchers,
I attach my report of monitoring for Larry's transmissions on 16/17, 17/18,
and 18/19 of January.
73 John, G4CNN


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I used Easygram to monitor on all 3 nights 16/17, 17/18, 18/19 using the highest resolution, i.e. an FFT size of 16384, and a Sampling rate of 5512. On the first night I set the delay so that the window scan time was 5 minutes and set the timer to take photos every 5 minutes. On the second night the same but with 10 minute intervals and the third night with 15 minute intervals. This was because Larry had announced that he would send 1 minute, 2 minute and 3 minute dashes on successive nights. However it was unclear whether this was an increasing interval or reducing and in any case it seems he actually sent 1.5 minute dashes.
The first and third nights I did indeed capture dashes and have already reported to Larry the results of the first night's monitoring. The second night failed because of problems with Easygram (blank (black) photos). The third night, I saw the clearest dashes between 22.20 and 23.30 and did notice an apparent increase in frequency just after midnight. I also saw dashes between 00.24 and 00.39.
In order to determine the exact frequency I copied each image into Paint Shop Pro and using the vernier scale determined the exact y-coordinate of every trace, including two frequency markers. Then using the known frequency markers, I converted these coordinates to actual frequencies.

Then I saw the e-mails from Andy and Jim. I read and re-read these e-mails and no-way can I match my observations with theirs.

My first thought was that my results must be innacurate. So I have spent a long time using Spectran at its highest resolution (0.031Hz) and carefully measured the position of each and every line in this part of the spectrum. Then with a table of differences calculated from the known Loran line frequencies found a very good match over 30 or so consecutive Loran lines.
These told me that my receiver was out by 1.7896 Hz. Further I was able to then accurately measure two strong non-Loran lines that were visible in both Spectran and the Easygram images and found practically no difference in the accuracy of the two software packages, and very good linearity in the Easygram images.

Allowing for the error in the Rx setting, It turned out that the dashes between 0024 - 0039 were at a frequency of 137788.0 +/- 0.1Hz and those between 00.24 - 00.39 were at a frequency of 137789.3 +/- 0.1Hz. So it appears that if any, it were the latter that were transmitted by Larry, but these were very weak, and it was impossible to say with any certain where dashes started and stopped.

A few comments on Andy's e-mail. An accuracy of 0.05 ppm corresponds to about 0.01Hz at this frequency, but with Spectran it is not possible to measure more accurately than to 0.1 Hz.
If we need to measure to this accuracy, how do we do it? What specialist hardware/software is required?

I list below every trace that I could see in this part of the spectrum including all of the Loran lines seen and identified with considerable certainty.

QRA	  frequency	when seen	strength
		yymmdd:hhmm
Loran	137735.8491		weak
Loran	137738.3651		very weak
	137739.6104	010116	wanderer
Loran	137743.2774		medium
FRENCH	137744.4604	010116	strong
Loran	137745.0327		very weak
E/W	137745.7104	010116	medium
	137747.0104	010116	weak
N/S	137748.4104	010116	weak
E/W	137748.7104	010116	weak
	137750.5104	010116	very weak
Loran	137750.7057		very weak
	137751.2104	010116	very weak
Loran	137751.7002		very weak
	137752.1304	010118	weak
E/W	137752.3104	010116	medium
E/W	137753.5104	010116	weak
	137754.1104	010116	medium
E/W	137756.2104	010116	weak
Loran	137758.1340		weak
Loran	137758.3678		very weak
	137760.5704	010118	weak
WHAT??	137763.8104	010116	Strong carrier
Loran	137765.0353		very weak
Loran	137765.5623		weak
	137767.7504	010119: 0130	medium dots
	137770.2104	010116	very weak
Loran	137771.7029		very weak
Loran	137772.9906		medium
	137774.0704	010118	weak
Loran	137778.3704		very weak
Loran	137780.4190		medium
	137784.6204	010118	weak
Loran	137785.0380		very weak
Loran	137787.8473		medium
	137788.0004	010118	weak
Larry?	137789.2604	010118:0024-0039	weak dashes
N/S	137790.3104	010117	strong
Loran	137791.7056		weak
	137793.4804	010118	weak
Loran	137795.2756		medium
Loran	137798.3731		weak
Loran	137802.7039		weak
	137803.1904	010118	weak
Loran	137805.0407		very very weak
Loran	137810.1322		medium
Loran	137811.7082		weak
	137816.2704	010118	weak
Loran	137817.5605		not seen
Loran	137818.3758		not seen
	137819.6404	010118	weak
	137820.2104	010116	very weak
	137820.6104	010116	weak
	137821.5104	010116	strong
	137822.5104	010116	weak
	137823.5104	010116	very weak
Loran	137824.9889		medium
Loran	137825.0433		medium
	137829.7704	010118	very weak
Loran	137831.7109		very weak
Loran	137832.4172		weak
Loran	137838.3785		medium
	137841.5904	010118:2240	strong for 10 mins


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