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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Low\s+frequency\s+preselectors\?\s*$/: 8 ]

Total 8 documents matching your query.

1. LF: Low frequency preselectors? (score: 1): Author: "Jordan" <[email protected]>; Date: Thu, 27 Aug 2009 16:04:33 -0600; Hello group.... Other than the PAL, MFJ etc., type, are there commercially available preselectors that would tune from 10khz to 2 or 3 Mhz...? Or could someone point me to a homebrewing site..? Thank; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-08/msg00188.html (11,049 bytes)
2. Re: LF: Low frequency preselectors? (score: 1): Author: "Roelof Bakker" <[email protected]>; Date: Fri, 4 Sep 2009 21:17:16 +0200; Hello Jordan, Regarding Q, I have used potcores, but this is not necessary at all. Standard moulded rf chokes, those that look like resistors, give excellent results. I have found that the bandwidth; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00074.html (10,377 bytes)
3. Re: LF: Low frequency preselectors? (score: 1): Author: "Roelof Bakker" <[email protected]>; Date: Fri, 04 Sep 2009 11:55:49 +0100; Hello Jordan, Sorry for the delay, I just forgot to answer your question. In the attachment you will find the circuit diagram of a tuneable pre-amplifier. I have build several of these and the freque; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00076.html (10,666 bytes)
4. Re: LF: Low frequency preselectors? (score: 1): Author: "Jordan" <[email protected]>; Date: Sat, 5 Sep 2009 08:30:27 -0600; Hi again Roelof.... I did not see the message from Jim.... can you forward it to me..? 73...Jordan... Dear Jim, Thank you for your comments. I will try the circuit as in your description. Best regard; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00106.html (10,555 bytes)
5. Re: LF: Low frequency preselectors? (score: 1): Author: "Jordan" <[email protected]>; Date: Fri, 4 Sep 2009 09:19:01 -0600; Thanks Roelof..! It looks like a fairly narrow band preamp with good Q...I guess it depends on the Q of the inductors...I'll put the design to good use..! 73...Jordan.... Hello Jordan, Sorry for the; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00118.html (10,846 bytes)
6. Re: LF: Low frequency preselectors? (score: 1): Author: "James Moritz" <[email protected]>; Date: Fri, 4 Sep 2009 23:19:24 +0100; Dear Jordan, Roelof, LF Group, I have used a very similar circuit to the one in Roelof's schematic for some time (it is in the RSGB's "Radio communication handbook", and "LF Today"- I should declare; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00132.html (13,135 bytes)
7. Re: LF: Low frequency preselectors? (score: 1): Author: "John RABSON" <[email protected]>; Date: Fri, 04 Sep 2009 10:44:07 +0200; Hello Jordan, Did you get any replies? 73 John Rabson F5VLF 58800 Cervon France JN17vg ** REPLY SEPARATOR **; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00510.html (9,873 bytes)
8. Re: LF: Low frequency preselectors? (score: 1): Author: "Roelof Bakker" <[email protected]>; Date: Sat, 05 Sep 2009 12:00:38 +0100; Dear Jim, Thank you for your comments. I will try the circuit as in your description. Best regards, Roelof, pa0rdt; /rsgb_lf_group-archives/html/rsgb_lf_group/2009-09/msg00848.html (9,994 bytes)

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