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Total 106 documents matching your query.

1. LF: Pure off-topic: old tubes (score: 1)
Author: Petr Maly <>
Date: Mon, 7 Jul 2014 09:20:29 +0200
Hello all I apology for the off-topic. However I know that this group is attended by very experienced gents, mainly from the UK. I found these two tubes in the junk, see the attachment. I spent quite
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-07/msg00020.html (12,833 bytes)

2. LF: Re: Pure off-topic: old tubes (score: 1)
Author: Petr Maly <>
Date: Tue, 8 Jul 2014 14:49:18 +0200
Thanks all for your responses. The valves looked NOS therefore I searched for specs to be able to make a small PA with them. Now it looks I will put them back on the shelf for another twenty years in
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-07/msg00028.html (17,387 bytes)

3. LF: Re: Pure off-topic: old tubes (score: 1)
Author: Petr Maly <>
Date: Tue, 8 Jul 2014 15:44:12 +0200
Hello Marco, You are so kind. Thank you very much. My tubes look exactly like 4B/551B(D). I will measure the dimensions to be sure as soon as I can. It looks convenient that the filament voltage is t
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-07/msg00030.html (11,219 bytes)

4. LF: What happened 16 years ago (score: 1)
Author: Petr Malư <>
Date: Tue, 29 Nov 2016 14:30:43 +0000
Do you remember? https://www.youtube.com/watch?v=0L4dMP_GH48 73, Petr, OK1FIG
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-11/msg00293.html (9,923 bytes)

5. LF: TDA2003, TDA2030 for PA? (score: 1)
Author: Petr Malư <>
Date: Wed, 25 Mar 2009 14:38:37 +0100
Hi all, My intention is to build a small transmitter up to some 10W for 136 and 505 kHz, this time not the D class, but B or AB class. I think of employing AF amplifiers such as TDA2003, TDA2030, or
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-03/msg00420.html (9,501 bytes)

6. Re: LF: Tune and match the ant for 50kHz...550kHz (score: 1)
Author: Petr Malư <>
Date: Mon, 6 Apr 2009 09:28:52 +0200
Hello all, Thanks all for your comments, it helps. I can't recall that anybody would ever mention the possibility to change serial connection of the coils of a variometer to the parallel one. If the
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-04/msg00118.html (15,937 bytes)

7. Re: LF: Tune and match the ant for 50kHz...550kHz (score: 1)
Author: Petr Malư <>
Date: Thu, 2 Apr 2009 15:15:34 +0200
Hello Ha-Jo Thanks for your suggestion. My transmatch woud be used mainly for RX, however, I still believe that a tuned antenna is better than detuned one. At least it is a good preselection for RX.
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-04/msg00242.html (15,982 bytes)

8. LF: Tune and match the ant for 50kHz...550kHz (score: 1)
Author: Petr Malư <>
Date: Thu, 2 Apr 2009 09:26:22 +0200
Hi all, I want to make a small transmatch (RX, TX up to 10 Watts, or so) to tune LW 41 m (or smaller T-ant) in the range 50 ... 550 kHz. I am not too good in theory... but I believe that the most eff
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-04/msg00409.html (10,511 bytes)

9. LF: Up-converter 0...550 kHz (score: 1)
Author: Petr Malư <>
Date: Tue, 14 Apr 2009 11:38:44 +0200
Hi all, I have made a tunable up-converter for VLF, LF and MF. Nothing ground-breaking, perhaps, but maybe a little inspiration for some. I have compared the result with a professional receiver RFT E
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-04/msg00416.html (8,483 bytes)

10. LF: Re: Low freq DDS VFO any ideas / for sale etc ? (score: 1)
Author: Petr Malư <>
Date: Wed, 13 May 2009 09:28:11 +0200
Hello Graham, I use DDSv4: http://www.rmt-tech.com/Products.html I use it in my up-converter: http://ok1fig.nagano.cz/UC5695/Uc5695.htm I was so happy with it that I purchased two units more for the
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00508.html (13,703 bytes)

11. LF: Litz wire (score: 1)
Author: Petr Malư <>
Date: Thu, 3 Sep 2009 09:59:32 +0200
Hello all, Short of a thick litz wire? I found this item on eBay right now: http://cgi.ebay.com/Litz-wire-660-46-for-crystal-radio-coil-Loop-anten-60_W0QQitemZ160360053886QQcmdZViewItemQQptZLH_Defaul
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00116.html (8,115 bytes)

12. LF: WEB, 505kHz availability (score: 1)
Author: Petr Malư <>
Date: Thu, 22 Oct 2009 10:54:35 +0200
Hello all, I wonder where the following web disappeared: http://www.picks.force9.co.uk/index.htm is it just temporarily unavailable, moved to another address, or canceled totally? It was a great sour
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-10/msg00492.html (9,630 bytes)

13. LF: Variometer on eBay (score: 1)
Author: Petr Malư <>
Date: Tue, 20 Oct 2009 10:05:34 +0200
Hello all, Too lazy to make variometer? LF/MF-related items rarely appear on eBay, here comes one: http://cgi.ebay.de/Variometer_W0QQitemZ110447622031QQcmdZViewItemQQptZDE_TV_Video_Elektronik_Funkger
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-10/msg00550.html (9,628 bytes)

14. LF: QOA? (score: 1)
Author: Petr Malư <>
Date: Tue, 22 Dec 2009 13:34:49 +0100
Hi Lowfers, I looked for some Q-codes recently and one of them struck my eyes. Do you know what QOA means? It means "can you/I can work telegraphy on 500kHz". 73 and have a nice X-mass, Petr, OK1FIG
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-12/msg00014.html (8,798 bytes)

15. LF: Re: TX-2200A (score: 1)
Author: Petr Malư <>
Date: Wed, 9 Dec 2009 17:14:09 +0100
Well, I am not sure that it is a good news, in fact. So far only people that were able and willing to build their own TX's (Ropex First was not a hit, was it) were on the band. And the ham-spirit exi
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-12/msg00567.html (11,296 bytes)

16. LF: Siemens Pegel Messer D 2006 (score: 1)
Author: Petr Malư <>
Date: Mon, 23 Aug 2010 11:54:42 +0200
Hello all, I recently purchased Siemens Pegel Messer (selective level meter) D 2006. It was a quick casual purchase, extremely cheap. Unfortunately no documentation was available along. I have search
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00091.html (9,578 bytes)

17. Re: LF: HE3OM (score: 1)
Author: Petr Maly <>
Date: Mon, 31 Jan 2011 08:55:43 +0100
Hi all, I also heard HE3OM, at 14:15 UTC on Jan 30rd, RST 599, on 137.32 kHz. Very strong signal, indeed. 73, Petr, OK1FIG JO80dh From: mal hamilton Sent: Sunday, January 30, 20
/rsgb_lf_group-archives/html/rsgb_lf_group/2011-01/msg00331.html (9,428 bytes)

18. LF: Re: Mini-Whip Antenna (score: 1)
Author: Petr Maly <>
Date: Fri, 14 Jan 2011 12:15:35 +0100
Hello Roelof, It is an honour for me to have the answer directly from the author of this little magic thing. I didn't realize that you are on the group as well. How long did it take you to develop it
/rsgb_lf_group-archives/html/rsgb_lf_group/2011-01/msg00609.html (10,643 bytes)

19. LF: Mini-Whip Antenna (score: 1)
Author: Petr Maly <>
Date: Fri, 14 Jan 2011 08:51:24 +0100
Hi all, I have made a Mini-Whip antenna. I was just curious whether it can actually work or not. I tested it in a rf-quiet rural area. The antenna was drawn up to about 13 m, see the attached image.
/rsgb_lf_group-archives/html/rsgb_lf_group/2011-01/msg00635.html (9,852 bytes)

20. Re: LF: Dumb homebrewer - Advice needed (score: 1)
Author: Petr Maly <>
Date: Wed, 2 Feb 2011 14:28:22 +0100
It is perhaps not so critical on LF and MF. I did it like that anyway: http://www.nagano.cz/~ok1fig/MiniLoadingCoil/P1171705.JPG http://www.nagano.cz/~ok1fig/MiniLoadingCoil/P1171705.JPG 73, Petr Fro
/rsgb_lf_group-archives/html/rsgb_lf_group/2011-02/msg00654.html (10,765 bytes)


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