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1. LF: Low pass filter 1 kW 136k 472 k what components to choose? (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sun, 21 Dec 2014 16:38:16 +0100
Dear OMs, just a question strait forward: What componnets I should choose for a low pass filter for 136 kHz and 472 kHz, two filters to be designed. 136 kHz: Pin abt 1,5 kW 472 kHz: Pin abt 0,5 kW SW
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00196.html (10,118 bytes)

2. LF: Fw: Low pass filter 1 kW 136k 472 k what components to choose? Tnx to all (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sun, 21 Dec 2014 21:31:23 +0100
Dear OMs, thank You for the quick answer just in one day. Isn t it nice to get replies from technical experts just in a few hours? I compared Your drafts with an already built construction of me usin
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00201.html (11,929 bytes)

3. LF: TRX-switching (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Mon, 30 Jan 2017 20:44:14 +0100
Dear OMs, I need `nt a full switching circuit, as I have a power output of the vac relais (Jennings dpdt (2 mal um), too slow for qsk) in receive path of abt -17 dbm in transmit mode, and I wish to a
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00277.html (9,330 bytes)

4. Fw: Aw: Re: LF: A transductor for power regulation? (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sat, 22 Apr 2017 16:27:55 +0200
Gesendet: Freitag, 21. April 2017 um 22:33 Uhr Von: "Hans-Albrecht Haffa" <> An: Betreff: Aw: Re: LF: A transductor for power regulation? Dear Lowfers, years
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00309.html (18,042 bytes)

5. LF: A transductor for power regulation? (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Tue, 25 Apr 2017 22:26:41 +0200
Hallo Stefan, definitely wrong, what You say. The stray field of the centre leg winding puts the yokes to saturation. Stray field closes throug the outer legs. This means the stray field of the centr
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00353.html (21,216 bytes)

6. LF: DK8ND cqing 472k on 13.01.2018 (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sat, 13 Jan 2018 15:09:34 +0100
Dear OMs, this weekend I will call cq with my new tx on 472,50 kHz in the evening, abt 19. 00 utc on saturday and sunday. Please lisn to my sigs. Mode cw aural cw. TX: ENI 3200 AMT, driven to 250W...
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00178.html (8,377 bytes)

7. Aw: LF: DK8ND cqing 472k on 13.01.2018/ 14.01.2018 (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sun, 14 Jan 2018 22:13:28 +0100
Dear OMs, thank You for Your patience listening t my sigs. From my Log: Date/ utc/ call/ frequ/ sent/ rcvd/mode/ remarks 13.1.17 16.26h I 2 BBJ 472k 599 559 A1A 16.57 IK2DE 579 569 18.37 DL4HG 339 55
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00210.html (12,990 bytes)

8. Aw: LF: VLF6 (audio stream) temporarily off E310 (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Mon, 22 Jan 2018 20:53:14 +0100
Dear Wolfgang, a suitable replacement for E310 is BF245, BF246, still available. Check pin arangement and gain factor. 55, Hans-Albrecht DK 8 ND Gesendet: Montag, 22. Januar 2018 um 18:08 Uhr Von: "W
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00288.html (9,870 bytes)

9. Aw: LF: Dummy load (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sun, 25 Nov 2018 22:06:27 +0100
Dear OM Elmer, depending on the power You intend to use, I recomend homebrew Dummy Loads, indeed attenuators only up to a power of 100 Watt. Wovings of bifilar wound fibre glass filaments and Nickel
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-11/msg00624.html (10,246 bytes)

10. LF: cq weekend DK 8 ND (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Fri, 30 Nov 2018 21:09:30 +0100
Dear OMs, I will be active this weekend in calling cq on 472,50 kHz or nearby in cw. P =-2 db(kW) 60 Ohm, Ant 20 m Vertical. Stns in south Germany are kindly asked to be active. My queswtions: Is non
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-11/msg00678.html (8,129 bytes)

11. Aw: Re: [Lowfer] LF: Re: FET change, hmmm (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Fri, 30 Nov 2018 21:03:29 +0100
Dear OMs, dear Paul, You are pointing to a general problem in driving fets, what is not easy, it is the same sophisticated jopb as with bipolar transistors in power electronics, in Your case a switch
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-11/msg00679.html (20,609 bytes)

12. Aw: Re: LF: cq weekend DK 8 ND (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sat, 1 Dec 2018 19:28:13 +0100
Dear Ricardo, sri, soon after I had sent the e-mail to the reflector, I had an insulation breakdown in the antenna. So, no cq on friday evening. I do this now on saturday, 472,50 kHz. What happened:
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-12/msg00015.html (13,314 bytes)

13. LF: my cq on 472k last weekend, from DK 8 ND (score: 1)
Author: "Hans-Albrecht Haffa" <>
Date: Sun, 2 Dec 2018 17:08:01 +0100
Thanks to Dix, DJ6CB and PA9M, for ur report to my sigs on 472,5 kHz. It seems to be that I must have a receiving problem, thoug my rig ist unchanged since Jan. 2018. Here in South Germany I cannot r
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-12/msg00019.html (9,165 bytes)

14. Re: LF: LF/MF EER transverter (score: 1)
Author: Hans-Albrecht Haffa <>
Date: Thu, 08 Nov 2007 21:13:46 +0100
Dear Jim, please be so kind to send me a copy of Your articlae. 55, Hans-Albrecht _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer O
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-11/msg00233.html (9,916 bytes)

15. LF: TNX all; DK8ND on 137.7KHz this morning (score: 1)
Author: Hans-Albrecht Haffa <>
Date: Sun, 13 Jan 2008 21:18:13 +0100
Dear OMs,thank You for Your reply. I have been qrv this morning, without success. I have called abt three times cq. 1808z QSO DF6NM (dfcw3) me qrs3 both OO, for me aural cw was possilble (rst449 at a
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-01/msg00309.html (10,255 bytes)

16. LF: 136k Weekend Acty 5.-6.01.2007 (score: 1)
Author: Hans-Albrecht Haffa <>
Date: Mon, 07 Jan 2008 19:57:12 +0100
Dear OMs, on my new qth JN48HQ on Saturday I heard DK4U (qrss10) mm 20.11z and RU6LA mm Sunday 6.1.2007 15.20z wkd DL4AU mm/oo.0n 137k73 It seems that there are periods, where for me traffic is possi
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-01/msg00408.html (8,288 bytes)

17. Re: LF: 136k Weekend Acty 5.-6.01.2007 Tnx to all (score: 1)
Author: Hans-Albrecht Haffa <>
Date: Tue, 08 Jan 2008 20:49:32 +0100
Dear OMs, thank You for Your replies. Next weekend I will be qrv again on 137k77 in qrss3/ qrss10. It is a challenge to transmit from a little cottage with garden in urban noise environment. Please a
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-01/msg00431.html (9,227 bytes)

18. LF: off topic: Useful headphones (score: 1)
Author: Hans-Albrecht Haffa <>
Date: Sun, 13 Jan 2008 21:31:56 +0100
Dear OMs, At Helmut Singer Elektronik (http://www.helmut-singer.de ) I have bought an Radio Accessories Funkzubehör MIL Clansman HEADSET TYP II, with useful noise cancelling. I just had to build an p
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-01/msg00508.html (8,474 bytes)

19. LF: Wanted: TX 136 kHz ca. 200 W (score: 1)
Author: Hans-Albrecht Haffa <>
Date: Mon, 11 Feb 2008 21:59:43 +0100
Dear Lowfers, sooner or later I am looking for an TX for 136 kHz, giving me reasonable more output than my present one with abt. 70 W_60 Ohm. Power supply should be DC or 230V single phase, my cottag
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-02/msg00248.html (8,125 bytes)

20. Re: LF: 137 khz no acty from DK 8 ND (score: 1)
Author: Hans-Albrecht Haffa <>
Date: Tue, 06 Jan 2009 21:52:37 +0100
Dear Mal, it seems for me, that Our band 136k is not anymore a challenge for us. I know that I have no more contacts with DK 7 SU on Sunday morning, but now, as on new qth my station is qrv again I h
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg01092.html (9,846 bytes)


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