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1. Re: LF: A second soundcard (score: 1)
Author: "Andy Talbot" <>
Date: Sun, 16 Sep 2007 19:03:44 +0100
You can have as many cards as you like - try a USB one like the Edirol UA-1EX for good quality audio, or the Logitech headset for headphone / boom-mic. Or do HP have some sort of corrupted operating
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00015.html (11,337 bytes)

2. LF: Running Jason mode - an update (score: 1)
Author: "Andy Talbot" <>
Date: Tue, 25 Sep 2007 09:29:49 +0100
Alberto reminded me that this issue of Jason appearing to lock-up was mentioned earlier here. Set the compatibility mode for the Jason software to Win98/ME and it works fine. I did this for Tcube too
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00023.html (14,331 bytes)

3. Re: LF: Re: WE2XGR/2 in Jason mode (score: 1)
Author: "Andy Talbot" <>
Date: Sat, 22 Sep 2007 22:03:16 +0100
I've just downloaded Jason .99 and can't get it to run at all. It appears to do nothing when launched, but is being loaded into memory and I can see it in Task Manager, Processes. But it won't appear
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00045.html (12,602 bytes)

4. Re: LF: Re: WE2XGR/2 in Jason mode (score: 1)
Author: "Andy Talbot" <>
Date: Sun, 23 Sep 2007 08:40:14 +0100
I can make Jason run by launching it twice, then going into Task Mnager and deleting the first instance of Jason.exe from the process list - the second instance appears, lower down.. After deleting t
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00092.html (15,204 bytes)

5. Re: LF: A question of calibration (score: 1)
Author: "Andy Talbot" <>
Date: Fri, 28 Sep 2007 10:58:43 +0100
There appear to be two meanings to the term "far field" when applied to antennas. One is usually reserved for electrically LARGE antennas and is the point where the wavefront can be considered to be
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00100.html (12,975 bytes)

6. Re: LF: A question of calibration (score: 1)
Author: "Andy Talbot" <>
Date: Fri, 28 Sep 2007 17:02:17 +0100
Blimey ! That is dramatic. And there is a minute wobble up to about 10 times the distance as well - which would probably give 2% - 3% error. So, in a way, one could almost say the RSGB figure "is rig
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00105.html (19,489 bytes)

7. Re: LF: A question of calibration (score: 1)
Author: "Andy Talbot" <>
Date: Fri, 28 Sep 2007 13:50:54 +0100
Yes, it would be "certainly true" that 10 times the recognised distance is in the far field. It certainly provides a huge safety margin! Most texts use 2.pi, although I did once see 4.pi quoted. Andy
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00149.html (15,700 bytes)

8. LF: Local AM transmitter on PC output (score: 1)
Author: "Andy Talbot" <>
Date: Tue, 2 Oct 2007 15:58:42 +0100
While testing an IQ upconverter chip, I discovered I've got several tens of millivolts of Virgin AM on 1215kHz coming out of my PC's audio output. There is enough signal to see it on a frequency coun
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00016.html (10,478 bytes)

9. Fwd: LF: Re: Olivia data test (score: 1)
Author: "Andy Talbot" <>
Date: Fri, 26 Oct 2007 17:58:31 +0100
If anyone uses JT2 on the LF bands, Joe would be interested in your findings... Andy G4JNT www.scrbg.org/g4jnt Hi Andy, Thanks for sending me a copy of your message to the RSGB LF group. I will be ve
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00017.html (12,157 bytes)

10. Re: LF: Re: Olivia data test (score: 1)
Author: "Andy Talbot" <>
Date: Tue, 16 Oct 2007 08:28:55 +0100
I've been watching with interest the use of the narrow versions of the various data modes being used on the 500kHz band, and anyone who reads RadCom will see the mention I made in the Data Column las
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00332.html (13,719 bytes)

11. Re: LF: RADCOM (score: 1)
Author: "Andy Talbot" <>
Date: Mon, 29 Oct 2007 11:38:33 +0000
Don't be put off by the need for house styles etc - if you do look at the articles that have made it in the past, they were all in the authors own words. The peer review is more or less a rubber stam
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00342.html (15,155 bytes)

12. Re: 500 LF: RADCOM (score: 1)
Author: "Andy Talbot" <>
Date: Thu, 25 Oct 2007 16:35:30 +0100
Sri - we're being rather parochial. Radcom is the magazine of the RSGB, for members only. It used to be half full of technical articles with the rest made up of operating, news and events. Now it see
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00378.html (16,560 bytes)

13. Re: LF: RADCOM (score: 1)
Author: "Andy Talbot" <>
Date: Wed, 24 Oct 2007 10:52:49 +0100
My Radcom seems to be missing all the technical articles - In fact, I don't recall seeing them in any issue over the last year or so. Who else has noticed this unfortunate trend for sections to go mi
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00388.html (11,229 bytes)

14. Re: LF: RADCOM (score: 1)
Author: "Andy Talbot" <>
Date: Mon, 29 Oct 2007 11:59:24 +0000
OOPS actidently hit send on the earlier post, this is how the previous posting should have been... Johan's and John's comments both copied below say it all. Don't be put off by the need for house sty
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00394.html (17,239 bytes)

15. Re: LF: Chebyshev (score: 1)
Author: "Andy Talbot" <>
Date: Mon, 29 Oct 2007 12:10:01 +0000
If you want simple lumped ones, my website contains a basic filter design prog http://www.scrbg.org/g4jnt/designsw.htm For more advanced stuff, I use Ansoft Designer SV (student version) which has a
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00428.html (11,211 bytes)

16. Re: LF: 500 tx (score: 1)
Author: "Andy Talbot" <>
Date: Thu, 25 Oct 2007 17:45:26 +0100
Write it up and send it in... Andy G4JNT www.scrbg.org/g4jnt
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00462.html (11,191 bytes)

17. Re: LF: Local AM transmitter on PC output (score: 1)
Author: "Andy Talbot" <>
Date: Tue, 2 Oct 2007 17:09:26 +0100
OK, Tnx. Its definitely Fareham then, the MF mast only 5.5km away, on the top of a hill and visible from the A27, near the M27 Junction. Wondered what that mast was radiating. At 5500m, 1kW ERP works
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00484.html (12,699 bytes)

18. Re: LF: RADCOM (score: 1)
Author: "Andy Talbot" <>
Date: Thu, 25 Oct 2007 10:44:17 +0100
How about writing a few letters to the editor about the appalling tabloid route the Radcomic is taking? Giles (editor) himself is a bit concerned about the route the comic is moving, but I get the fe
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00487.html (14,269 bytes)

19. Re: LF: Re: CLASS D and E (score: 1)
Author: "Andy Talbot" <>
Date: Sun, 4 Nov 2007 16:57:28 +0000
In my 700 Watt direct-from mains transmitter http://www.scrbg.org/g4jnt/137tx.pdf efficiency came out somewhere between 80 to 90%. As Jim says, its difficult to measure accurately At one point, due t
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-11/msg00388.html (12,545 bytes)

20. Re: LF: CLASS D E (score: 1)
Author: "Andy Talbot" <>
Date: Mon, 5 Nov 2007 12:26:01 +0000
Its not difficult to measure RF voltage at this frequency. A scope calibration at DC will extrapolate accurately. Then you can measure I using a current transformer / resistor. Getting within a few p
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-11/msg00390.html (11,356 bytes)


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