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381. Re: LF: WSPR Beacon 137 (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 26 Mar 2018 07:40:41 +0100
Best spots overnight:
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00317.html (15,670 bytes)

382. Re: LF: Pout vs V for class D amp? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 30 Mar 2018 00:33:00 +0100
Take a look at http://www.g4jnt.com/137tx.pdf All the equations you need are in there and "single ended" in that context refers to class A / B   not E Class E is a special (quasi resonant) type of sw
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00376.html (9,808 bytes)

383. LF: Phase of MSF through the day (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 30 Mar 2018 18:01:41 +0100
The plot below and also to be found at http://www.g4jnt.com/DropF/clipboard_201803301751.png   shows the phase and amplitude of the MSF 60kHz signal received here on the south coast over a period of
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00389.html (11,167 bytes)

384. Re: LF: Phase of MSF through the day (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 30 Mar 2018 20:29:41 +0100
http://www.g4jnt.com/DropF/clipboard_201803301751.png   shows the phase and amplitude of the MSF 60kHz signal received here on the south coast over a period of 5 hours.  Whilst I would expect phase c
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00395.html (12,776 bytes)

385. LF: More Phase plots (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sat, 31 Mar 2018 08:35:57 +0100
While I'm still on a roll with high stability off-air monitoring, here is a plot of the one remaining 100kHz  transmission, from Anthorn, taken overnight.   http://www.g4jnt.com/DropF/clipboard_20180
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00400.html (9,048 bytes)

386. Re: LF: More Phase plots (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sat, 31 Mar 2018 11:05:45 +0100
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00403.html (14,036 bytes)

387. Re: LF: W1VD amp help (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 8 Apr 2018 13:09:42 +0100
Done, verified that it looks OK with scope. (Previously I had not been testing with the DC offset!)    I've reduced drain voltage to 13V so that I can do that. I have no dummy load which can handle
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00109.html (12,586 bytes)

388. Re: LF: W1VD amp help - more waveforms (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 9 Apr 2018 19:06:46 +0100
I'm a bit late coming to this discussion, but that ringing looks exactly like that you get when there is too much leakage inductance in the transformer.  It is common to see such waveforms in SMPSUs
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00134.html (19,397 bytes)

389. Re: LF: W1VD amp help - IR2110 and timing (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 10 Apr 2018 22:01:46 +0100
Everyone, stop, think. Stop clutching at straws Ringing like that, showing several cycles of oscillation has to be  caused by a resonance at a higher frequency than the wanted one. Resonances are cau
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00148.html (17,730 bytes)

390. Re: LF: Windows software to drive a relay at a given time? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 11 Apr 2018 12:18:33 +0100
Try this http://www.g4jnt.com/DropF/simpletimer.zip It lets you abort the on time using the [esc] key Source code is in there as well  All in PowerBasic, command line compiler version (By far the nic
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00159.html (11,365 bytes)

391. Re: LF: Windows software to drive a relay at a given time? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 11 Apr 2018 12:22:32 +0100
Just in case it matters, I initially test for all valid COM ports by opening and closing each in turn,  then testing for an error.     If that causes problems to anything on another port that has not
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00160.html (12,541 bytes)

392. Re: LF: Windows software to drive a relay at a given time? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 11 Apr 2018 12:54:35 +0100
Yes, if you run it from a windows click, the whole thiing will close when it goes off and completes. Were you to run it from a command prompt, it would then merely say "OFF" and sit there looking unl
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00164.html (14,304 bytes)

393. Re: LF: Windows software to drive a relay at a given time? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 11 Apr 2018 17:51:19 +0100
There is now a prettier version at http://www.g4jnt.com/DropF/simpletimer.zip Same functionality, except it also allows  HH:MM as well as HH:MM:SS Andy On 11 April 2018 at 13:24, Chris Wilson <dead.f
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00174.html (12,976 bytes)

394. Re: LF: Windows software to drive a relay at a given time? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 12 Apr 2018 09:57:20 +0100
I used to have quite a few of an older type of those - given to me surplus.   An RS232 drive signal will drive one quite happily - they are designed to be driven from logic signals. The 25A rating wo
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00186.html (14,006 bytes)

395. Re: LF: Windows software to drive a relay at a given time? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 12 Apr 2018 10:11:49 +0100
I'd lay quite good odds on those control boards having  USB COM ports chips.   They could use the USB directly in HID mode, but then driver software has to use all the USB interfacing drivers etc. Wh
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00189.html (14,196 bytes)

396. Re: LF: W1VD amp help - more waveforms (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 12 Apr 2018 22:34:00 +0100
Yes, I agree with Alan and fail completely to see why the driver should have any effect on the ringing. It just cannot.  As I keep saying, such ringing is commonplace in SMPSUs and is due to leakage
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00204.html (18,955 bytes)

397. Re: LF: Active loop antennas (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 16 Apr 2018 12:56:36 +0100
http://www.lz1aq.signacor.com/ For LF use you could probably increase coupling caps and use a bigger loop, and change the input LPF This is the one members of our club (IVARC) have been making as a c
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00250.html (10,808 bytes)

398. Re: LF: Active loop antennas (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 16 Apr 2018 12:58:02 +0100
More accurately, this is the URL http://www.lz1aq.signacor.com/docs/wsml/wideband-active-sm-loop-antenna.htm 'jnt On 16 April 2018 at 12:56, Andy Talbot <[email protected]> wrote: http://www.lz1aq
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00251.html (11,350 bytes)

399. Re: LF: W1VD amp help - MY FINAL POST (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 23 Apr 2018 08:24:13 +0100
The irony here is that class-E does not mandate a short sharp gate drive.  As it is tuned and adjusted for zero Drain volts at the transition, the shape of the drive is less critical. So says Fred Ra
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00299.html (11,210 bytes)

400. Re: LF: Windows software to drive a relay at a given time? (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 26 Apr 2018 20:53:57 +0100
Have you checked it with any of your other COM ports? Check DTR and RTS both toggle appropriately Andy www.g4jnt.com On 26 April 2018 at 20:29, Chris Wilson <[email protected]> wrote: Hello Andy,  
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00323.html (15,680 bytes)


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