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Total 13 documents matching your query.

1. Re: LF: Topband Test (score: 1): Author: Andy Talbot <[email protected]>; Date: Thu, 3 Mar 2011 19:52:04 +0000; http://www.g4jnt.com/Download/1967jnt1.jpg http://www.g4jnt.com/Download/1967jnt3.jpg http://www.g4jnt.com/Download/1967jnt4.jpg Are three plots of a 4 Watt RF (probably no more than 500mW ERP) 19; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00099.html (13,261 bytes)
2. Re: LF: Topband Test (score: 1): Author: Andy Talbot <[email protected]>; Date: Thu, 3 Mar 2011 19:14:49 +0000; See the article on Dopplergrams published by G3PLX in Radcom some time around 1998 - 2000. (No record of teh exact publication date). Many plots of low-HF carriers splitting into two. We had to; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00139.html (11,777 bytes)
3. Re: LF: Topband Test (score: 1): Author: Andy Talbot <[email protected]>; Date: Thu, 3 Mar 2011 20:40:11 +0000; No, it definitely is due to ionospheric shift. 30m/s is no big deal over the period of the day/night transition. 30 minutes at that speed would be a mean change in height of 54km. Not unrealist; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00144.html (13,892 bytes)
4. Re: LF: Topband Test (score: 1): Author: Andy Talbot <[email protected]>; Date: Thu, 3 Mar 2011 19:22:30 +0000; May 1998, according to the RSGB Indexes... 'JNT On 3 March 2011 19:14, Andy Talbot <[email protected]> wrote: See the article on Dopplergrams published by G3PLX in Radcom some time around 1998 -; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00198.html (12,577 bytes)
5. Re: LF: Topband Test (score: 1): Author: "Chris" <[email protected]>; Date: Thu, 03 Mar 2011 21:55:49 +0100; Thanks again Andy and Markus, Yes, my feeling is that the reflective wave shift is due to doppler as the layer changes height. We need to try it again over a longer period. It is true there are a lot; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00277.html (15,758 bytes)
6. Re: LF: Topband Test (score: 1): Author: "Chris" <[email protected]>; Date: Thu, 03 Mar 2011 21:14:44 +0100; Hi Andy and Stefan, Fascinating pictures etc., many thanks. I am still not 100% sure what we're seeing in our test result yesterday and hope to investigate further. The effect we saw looks much more; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00366.html (15,010 bytes)
7. LF: Topband Test (score: 1): Author: "Chris" <[email protected]>; Date: Thu, 03 Mar 2011 19:56:58 +0100; Hi All, Yesterday evening Pete, M0FMT, transmitted QRSS on topband for a test. An unexpected effect was noticed with the trace splitting in two. Nothing new or 'earth shattering' I expect, but new to; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00384.html (10,626 bytes)
8. Re: LF: Topband Test (score: 1): Author: "Markus Vester" <[email protected]>; Date: Thu, 3 Mar 2011 22:42:12 +0100; Hi Andy, I'll bet against that ;-) If I recall right, Richard G3CWI used to have interesting Doppler plots and scattergrams from G3PLX on his website (eg. http://www.qsl.net/g3cwi/scatterg.htm). It s; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00606.html (18,042 bytes)
9. Re: LF: Topband Test (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Thu, 03 Mar 2011 20:25:29 +0100; Hello Chris, Thank you for the interesting link to a nice readable very up to date LF/VLF page! 73, Stefan/DK7FC Am 03.03.2011 19:55, schrieb Chris: Hi All, Yesterday evening Pete, M0FMT, transmitted; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00630.html (10,582 bytes)
10. Re: LF: Topband Test (score: 1): Author: "Chris" <[email protected]>; Date: Thu, 03 Mar 2011 21:59:14 +0100; Thanks Dex, Gets more curious by the minute! 73, Chris, G4AYT. -- Original Message -- From: "Dexter McIntyre W4DEX" <[email protected]> To: <[email protected]> Sent: Thursday, March 03,; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00661.html (11,313 bytes)
11. Re: LF: Topband Test (score: 1): Author: "Markus Vester" <[email protected]>; Date: Thu, 3 Mar 2011 21:28:50 +0100; Hi Chris, thanks for sharing this unusual observation. MHz. Interpreted as Doppler, a reflector would have to move at least 30m/s radially from your baseline. This seems a bit fast for an ionospheric; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00716.html (10,425 bytes)
12. Re: LF: Topband Test (score: 1): Author: Dexter McIntyre W4DEX <[email protected]>; Date: Thu, 03 Mar 2011 20:51:09 +0000; Steve, W3EEE, noticed this spreading on my flea power Part15 1704 khz sawtooth signal in 2004. http://www.w4dex.com/mf/hi_medfer/doppler/ Path distance was about 650 km. Dex; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00758.html (10,865 bytes)
13. Re: LF: Topband Test (score: 1): Author: "Markus Vester" <[email protected]>; Date: Thu, 3 Mar 2011 21:19:43 +0100; Hi Chris, thanks for sharing this unusual observation. From your screenshot, the split was up to about 0.35 Hz, or 0.2 ppm of 1.8 MHz. Interpreted as Doppler, a reflector would have to move at least; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-03/msg00865.html (11,614 bytes)

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