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Total 384 documents matching your query.

1. LF: Stacking toroids (score: 1)
Author: Chris Wilson <>
Date: Fri, 24 Mar 2017 19:13:13 +0000
Hello LF people, If I have a ferrite toroidal output transformer for a push pull Class D 136kHz amp, that gets warmish after a WSPR15 session, what would happen if I wound the same number of primary
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-03/msg00189.html (9,462 bytes)

2. Re: LF: Stacking toroids (score: 1)
Author: Chris Wilson <>
Date: Thu, 30 Mar 2017 13:30:15 +0100
Hello LF'ers, Saturday, March 25, 2017 Thanks for all the replies on my heating toroid question, as best as i can tell it's not the core per se that's heating, more the 4 turn primary winding, made o
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-03/msg00236.html (11,981 bytes)

3. Re: FW: LF: FETs getting sick - why not use tubes? (score: 1)
Author: Chris Wilson <>
Date: Wed, 5 Apr 2017 13:28:56 +0100
Hello M0FMT, Wednesday, April 5, 2017 Did you not find the Transorbs added capacitance upset things? I found the drain waveform was considerably deteriorated when I experimented with Transorbs to lim
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00026.html (10,797 bytes)

4. Re: ULF: RE: A new distance record on 970 Hz / 309 km band ...earth antennas (score: 1)
Author: Chris Wilson <>
Date: Wed, 5 Apr 2017 13:32:02 +0100
Hello Stefan, Wednesday, April 5, 2017 What impedance did you have to match with such an antenna used for TX Stefan? Congratulations on your remarkable experiments at ULF, I am stunned by what you ar
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00027.html (12,820 bytes)

5. LF: Wilkinson combiners (score: 1)
Author: Chris Wilson <>
Date: Thu, 6 Apr 2017 16:19:46 +0100
Hello LF'ers, I am experimenting with two cheaply made Class D push pull 136kHz amps using very cheap to buy (well under 2 each) FET's combined using a home brew Wilkinson combiner as per this web p
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00034.html (11,346 bytes)

6. Re: LF: Wilkinson combiners (score: 1)
Author: Chris Wilson <>
Date: Sat, 8 Apr 2017 17:42:33 +0100
Hello Markus, Thanks for the detailed reply, let me see if i have this straight though please, sorry if I appear a bit dense, it's probably because I am.... :) Right now I run one voltage mode Class
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00058.html (13,431 bytes)

7. Re: LF: Wilkinson combiners (score: 1)
Author: Chris Wilson <>
Date: Mon, 10 Apr 2017 10:46:53 +0100
Hello Clemens, Alan, Graham and all who replied re my combiner questions, Some great and patiently presented info here, thanks a bunch for explaining it so well and in such detail. I now have a much
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00083.html (15,866 bytes)

8. Re: LF: Wilkinson combiners (score: 1)
Author: Chris Wilson <>
Date: Mon, 10 Apr 2017 11:47:29 +0100
Hello Clemens, Markus, Alan, Graham and all who replied re my combiner questions, Some great and patiently presented info here, thanks a bunch for explaining it so well and in such detail. I now have
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00084.html (12,235 bytes)

9. Re: LF: Wilkinson combiners - More (score: 1)
Author: Chris Wilson <>
Date: Tue, 11 Apr 2017 11:50:01 +0100
Hello Andy, OK, I can see the elegance in that, but pardon the probably daft question, but at the combining output transformer, is its input taken from my existing output transformers' secondary wind
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00108.html (14,383 bytes)

10. Re: LF: Wilkinson combiners - More (score: 1)
Author: Chris Wilson <>
Date: Tue, 11 Apr 2017 13:00:31 +0100
Hello Clemens, Thanks for the images, appreciated, busy with work again, but will get onto more playing with combiner experiment ASAP, those N1BUG contacts are fickle, just a bit more power, or a tre
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00110.html (11,925 bytes)

11. Re: LF: Wilkinson combiners - More (score: 1)
Author: Chris Wilson <>
Date: Tue, 11 Apr 2017 14:41:55 +0100
Hello Paul, Have a look on the WSPR charts and let me know if you see a rarely or unused frequency and I will go through the saga of fiddling with my overly sensitive variometer and move off 137.550
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00115.html (11,993 bytes)

12. Re: LF: Wilkinson combiners - More (score: 1)
Author: Chris Wilson <>
Date: Tue, 11 Apr 2017 14:43:48 +0100
Hello Andy, Replies should just go to the list, I am not very good with GMAIL, I had to set up an account to use the Blacksheep group as it was spitting out my old e-mail address i use for everything
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00116.html (13,622 bytes)

13. Re: LF: Multiple messages (score: 1)
Author: Chris Wilson <>
Date: Thu, 13 Apr 2017 14:52:02 +0100
Hello KEN, As Alan says, you can edit how mail is sent, se screenshot in this link: http://www.chriswilson.tv/edit.jpg -- Best regards, Chris mailto:
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00145.html (10,037 bytes)

14. Re: LF: Currently off air (score: 1)
Author: Chris Wilson <dead.>
Date: Thu, 13 Apr 2017 14:54:48 +0100
Hello Mike, 13 April 2017 Get that back sorted and don't go doing anything rash, hope to see your signal again soon, all the best Mike!! -- Best regards, Chris mailto:
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00146.html (10,232 bytes)

15. Re: LF: 136 OP32 LAST 24HR (score: 1)
Author: Chris Wilson <>
Date: Thu, 13 Apr 2017 14:55:25 +0100
Hello Paul, 13 April 2017 Yes, that looks like a proper decode, right on the low limit of -40dB, I have now learnt that I *CAN* run OPERA32 as well as multiple instances per hour of WSPR2, I hadn't u
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00147.html (10,707 bytes)

16. Re: LF: Re: [rsgb_lf_group] VO1NA 477 OP8 :Start 2300 finish 0900 50 watts to monopole. (score: 1)
Author: Chris Wilson <>
Date: Fri, 14 Apr 2017 10:57:46 +0100
Hello Roelof, Friday, April 14, 2017 Disconnect the LAN cable from the PC? ;) Seriously though, I haven't seen an option to NOT upload spots with OPERA, although perhaps it SHOULD have one... -- Best
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00161.html (12,022 bytes)

17. Re: LF: 136 OP32 last 24 Hr (score: 1)
Author: Chris Wilson <>
Date: Fri, 14 Apr 2017 16:40:55 +0100
Hello Graham, 14 April 2017 W1VD amp fed from my U3S, into my usual short (20 foot) vertical with my big HF horizontal quad loop (450 foot plus) as a top hat. Been mowing the lawn today and found the
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00180.html (11,446 bytes)

18. LF: Poor aerial connection affecting gate waveforms?? (score: 1)
Author: Chris Wilson <>
Date: Sat, 15 Apr 2017 13:32:20 +0100
Hello LF'ers, A very happy Easter to everyone! I have a tech question tthat I am sure you more experienced operators can answer. yesterday I mowed the lawn and found some of my temporary earth leads
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00198.html (12,946 bytes)

19. Re: LF: Poor aerial connection affecting gate waveforms?? (score: 1)
Author: Chris Wilson <>
Date: Sat, 15 Apr 2017 15:10:22 +0100
Hello Graham, I don't know how important they are I am not a FET ;) All I know is the output transformer and the LP filter bank central toroid run a lot cooler if the wave forms aren't all spiky. I h
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00208.html (11,249 bytes)

20. Re: LF: Poor aerial connection affecting gate waveforms?? (score: 1)
Author: Chris Wilson <>
Date: Sat, 15 Apr 2017 18:37:31 +0100
Hello Graham, 15 April 2017 Just to be clear, this is just the original single amp that's been fine now for ages, not two combined.... Not sure if people are thinking this is part of my two amps via
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00215.html (11,868 bytes)


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