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381. Re: LF: Noise R75 - rs232 from smpsu - (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 26 Jul 2010 14:30:30 +0100
I've just ordered a couple of the DS2502 one-wire EEproms contained in the Dell PSU to tray hacking the contents to make a custom PSU.   But there's a long delivery time on them  from Farnell, so tha
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00084.html (18,344 bytes)

382. LF: Fwd: Fw: [600m] ZL4MD joins ZL1EE ... (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sat, 31 Jul 2010 12:02:29 +0100
From Murray who can't post to the LF Reflector at the moment... Andy www.g4jnt.com -- Forwarded message -- From: Murray Greenman <[email protected]> Date: 31 July 2010 11:15 Subject: Fw: [600m] ZL
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00105.html (11,546 bytes)

383. Re: LF: 137.500 kHz ROS MF-1 beacon (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 2 Jul 2010 08:01:55 +0100
A thought.  MF1 ROS is one symbol per second isn't it.  If you can decode at -33dB (presumably in the reference bandwidth of 2.5kHz)  that's -1dB S/N in a symbol bandwidth.   Which I'm not sure I can
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00144.html (14,971 bytes)

384. Re: LF: Problem resolved (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 5 Jul 2010 17:58:58 +0100
Use Digipan instead...? Andy www.g4jnt.com On 5 July 2010 17:44, John Bruce McCreath <[email protected]> wrote: Hello LFers, The problem is solved!  That date I mentioned in my other posting got
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00194.html (10,586 bytes)

385. Re: LF: Noise R75 - rs232 from smpsu - (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 23 Jul 2010 22:05:15 +0100
Yes, I've played with running laptops including Dells from all sorts of power supplies.  The nominal voltage can go a goodly 10 - 20% either way before it flags an error - and they seem to detect ove
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00215.html (13,341 bytes)

386. Re: LF: 137/500 (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sat, 24 Jul 2010 20:18:39 +0100
Would that be called an Aerial.     And would a ground based antenna be an   Earth :-)   Andy www.g4jnt.com On 24 July 2010 20:13, Gary - G4WGT <[email protected]> wrote: Hey Mal, That would be goo
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00235.html (11,414 bytes)

387. Re: LF: Digital modes comparison (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 30 Jul 2010 08:17:06 +0100
Try WSPR at 6Hz bandwidth  or JT4A at less that 20Hz.   They are both MSFK constant envelope schemes.   Andy www.g4jnt.com 2010/7/29 Stefan Schäfer <[email protected]> Andy, LF, Which di
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00261.html (14,046 bytes)

388. Re: LF: David Gibson on Earth antennas and propagation below 9 kHz (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 26 Jul 2010 15:09:53 +0100
I was thinking about this, and thoughts turned to a rather simpler antenna;  the folded dipole and how it would behave when electrically short.   A simple non-folded  electrically short dipole (negel
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00274.html (12,784 bytes)

389. LF: FRARS Hamfest 2010 (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 28 Jul 2010 10:37:38 +0100
On Sunday 8 August  The South Coast Beacon and repeater Group will have our usual stand at the Flight Refuelling Hamfest raising funds to keep all our 2.3 to 47GHz and 70.031MHz   Beacons on air 24/7
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00339.html (10,492 bytes)

390. Re: LF: Digital modes comparison (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 29 Jul 2010 22:07:16 +0100
It would be very interesting to see those figures normalised to a constant data rate / bandwidth.  For example, PSK31 shown at -10dB is identical to PKK63 at -7dB - well it would be, its the same mod
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00352.html (12,278 bytes)

391. Re: LF: 137.5 (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 1 Jul 2010 19:25:50 +0100
And your  CW waveform is how wide ? Andy www.g4jnt.com On 1 July 2010 19:20, mal hamilton <[email protected]> wrote: Not economical frequency use. see pic  
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00388.html (10,231 bytes)

392. Re: LF: Re: 3C90 toroids - good service from Farnell UK (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 20 Jul 2010 23:28:05 +0100
If you open an account with Farnell delivery is free (even for a single resistor), and ordering online is seriously easy.   Minimum effort clocked so far involved typing in a one search term, a scrol
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00416.html (16,486 bytes)

393. Re: LF: FRARS Hamfest 2010 (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 29 Jul 2010 17:19:36 +0100
Could do, but the postage will come to rather more than we were going to be asking for them. Andy www.g4jnt.com On 29 July 2010 17:09, Warren Ziegler <[email protected]> wrote: Andy,        Would you
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00445.html (12,242 bytes)

394. Re: LF: Fw: Covert Char per Min to Words per Min ? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 20 Aug 2010 21:19:40 +0100
  CMSK8 is 8 times faster than CMSK1, but its not the whole story.   If the link is too weak to support the faster speed, but the slow one gets through - which is then faster ?   CMSK8 that may work
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00037.html (15,267 bytes)

395. Re: LF: G4WGT Grabber. (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 15 Aug 2010 22:12:38 +0100
And I am considering replacing the transmission with a WSPR only beacon signal.  This will allow the use of a more efficient class E stage.   So, please shout now if you still are interested in the p
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00067.html (11,384 bytes)

396. Re: LF: Fwd: CMSK Beta released (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 6 Aug 2010 13:48:55 +0100
MSK does not lend itself to generation on a PIC.   It is NOT a two tone mode, but a waveform that transitions back and forth  around a circle in phase space.  Do not think of MSK as frequency Shift K
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00140.html (12,412 bytes)

397. Re: LF: VLF THOUGHT (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 31 Aug 2010 20:52:34 +0100
But think of the animals and birds with their extended hearing range. Andy www.g4jnt.com On 31 August 2010 19:54, mal hamilton <[email protected]> wrote: I see 15 Kilowatt audio amplifiers advert
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00175.html (11,646 bytes)

398. LF: Fwd: CMSK Beta released (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 5 Aug 2010 07:28:43 +0100
-- Forwarded message -- From: Murray Greenman <[email protected]> Date: 5 August 2010 07:14 Subject: CMSK Beta released To: Hi, there has been a lot of interest in the new software, and I'm sure m
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00248.html (17,422 bytes)

399. LF: G4JNT 500kHz beacon Off Airr for a while (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 16 Aug 2010 20:31:30 +0100
My 503.7kHz beacon is off air for a few days while I resite the mast holding one end of the Tee antenna.    The original mast was a Al scaffold pole screwed to a brick buttress strengthening the wall
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00369.html (10,423 bytes)

400. Fwd: Fw: LF: Fw: Covert Char per Min to Words per Min ? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 22 Aug 2010 15:17:54 +0100
-- Forwarded message -- From: Murray Greenman <[email protected]> Date: 22 August 2010 09:01 Subject: Fw: LF: Fw: Covert Char per Min to Words per Min ? To: Andy Talbot <[email protected]>
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00396.html (17,434 bytes)


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