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Total 20 documents matching your query.

1. SV: [AMPS] Portable linear using a DAF? (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Wed, 01 Nov 2000 07:57:37 +0200; I'm talking about both, the early ICOM switchers were internal types. According to a friend who had a rig fitted with one of these internal types, it ran hot and there were birdies. Eventually he too; /archives//html/Amps/2000-11/msg00003.html (6,629 bytes)
2. [AMPS] Portable linear using a DAF? (score: 1): Author: sm5ki@algonet.se (sm5ki); Date: Sun, 29 Oct 2000 10:53:08 +0100; Hej all: I want to collect together a light weight and compact ( low profile to get into a normal suit case) shortwave station for portable use including a light weight linear that I have to build my; /archives//html/Amps/2000-10/msg00646.html (8,934 bytes)
3. [AMPS] Portable linear using a DAF? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 29 Oct 2000 06:27:08 -0500; You won't because a switched HV supply will cost more than the entire PA, and is more difficult to engineer. It's especially difficult to switch thousands of volts in diodes, and keep RFI out of the; /archives//html/Amps/2000-10/msg00647.html (8,242 bytes)
4. [AMPS] Portable linear using a DAF? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 29 Oct 2000 14:52:28 -0500; comments included below Key design problems include - transformer resonates below switching frequency due to high capacitance in large number of turns required - slow switching speed of high voltage; /archives//html/Amps/2000-10/msg00651.html (12,788 bytes)
5. [AMPS] Portable linear using a DAF? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 29 Oct 2000 16:28:52 -0500; get your Oops...need better proof reading skills. At 450V, that's 1.0A and about 6 tubes in parallel for 450W. Or with a bit more agressive power supply, 600V, 10 tubes in parallel, for 900W out. exp; /archives//html/Amps/2000-10/msg00654.html (14,864 bytes)
6. [AMPS] Portable linear using a DAF? (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Mon, 30 Oct 2000 07:36:00 +1300; Have wondered about this myself. A toroidal 230v-230v isolation transformer 500w CCS would not weigh too much. Voltage double/quadruple to sweep tubes. Series filaments with say 6 x PL509 to give 240; /archives//html/Amps/2000-10/msg00655.html (10,992 bytes)
7. [AMPS] Portable linear using a DAF? (score: 1): Author: da_kang@hotmail.com (Jeff Wolf); Date: Sun, 29 Oct 2000 19:17:07 GMT; Use chassie 500W HyGain did this a number of years ago with a CB / 10 meter amplifier called the "afterburner". It wasn't very popular, since you had to run an "unearthed" station, however, it did w; /archives//html/Amps/2000-10/msg00660.html (9,815 bytes)
8. [AMPS] Portable linear using a DAF? (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 30 Oct 2000 11:16:43 EST; Hi Hans & Tom, They are available but, verrrrrrrry pricey. The engineering is not that hard. Two chips can take care of most of the work. One for a PFC boost stage -- Micro Linear ML4812, Texas Instr; /archives//html/Amps/2000-10/msg00678.html (9,961 bytes)
9. [AMPS] Portable linear using a DAF? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Oct 2000 13:44:18 -0500; The single most difficult aspect of the design is the transformer. A close second is RFI suppression, and switching devices at the two or three kilowatt level. I don't think a 250 watt output PA usi; /archives//html/Amps/2000-10/msg00685.html (9,715 bytes)
10. [AMPS] Portable linear using a DAF? (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 30 Oct 2000 16:39:22 EST; On Mon, 30 Oct 2000 13:44:18 -0500 "Tom Rauch" <w8ji@contesting.com> writes: Hi Tom, The transformers are not that hard, unless you are realllllllly trying to optimize them. A large cup core should b; /archives//html/Amps/2000-10/msg00688.html (11,431 bytes)
11. [AMPS] Portable linear using a DAF? (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 30 Oct 2000 21:14:41 EST; On Mon, 30 Oct 2000 17:49:31 -0500 "Tom Rauch" <w8ji@contesting.com> writes: Hi Tom, I have a some friend's who've been doing this kind of work for years -- one to drive big movie strobe lights and t; /archives//html/Amps/2000-10/msg00692.html (11,896 bytes)
12. [AMPS] Portable linear using a DAF? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Oct 2000 21:55:51 -0500; I've designed switchers and cleaned up switchers for amateur and commercial use at HF stations. No sale. 1.) The switcher is a square wave, or at least it should be close to one. The PA is a half-sin; /archives//html/Amps/2000-10/msg00693.html (10,991 bytes)
13. [AMPS] Portable linear using a DAF? (score: 1): Author: 2@vc.net (measures); Date: Mon, 30 Oct 2000 20:02:25 -0800; [chortle] - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com; /archives//html/Amps/2000-10/msg00698.html (8,606 bytes)
14. [AMPS] Portable linear using a DAF? (score: 1): Author: 2@vc.net (measures); Date: Mon, 30 Oct 2000 20:02:23 -0800; .... For those who try to dig QRP out of the static and ask for repeats of repeats, there is nothing fun about it. Transmitting less power than is needed to communicate is Rude. end - Rich..., 805.3; /archives//html/Amps/2000-10/msg00699.html (9,329 bytes)
15. [AMPS] Portable linear using a DAF? (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Mon, 30 Oct 2000 23:34:08 -0500; Perhaps. Certainly a good operator should realize that he isn't making it and crank up the power when necessary. On the other hand, transmitting MORE power than is needed to communicate is both rude; /archives//html/Amps/2000-10/msg00700.html (9,201 bytes)
16. SV: [AMPS] Portable linear using a DAF? (score: 1): Author: sm5ki@algonet.se (sm5ki); Date: Tue, 31 Oct 2000 07:27:35 +0100; Sorry Tom this time you may be wrong. I use this IC 751A switcher OUTSIDE the transceiver all the time in my portable station with very little problems - I hear only some tiny carriers wandering arou; /archives//html/Amps/2000-10/msg00701.html (12,730 bytes)
17. SV: [AMPS] Portable linear using a DAF? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 31 Oct 2000 07:53:20 -0500; When the switcher is installed in the 751A radio, it couples directly into the VCO coils and other inductors near the switcher. The only cure is to move or remove the switcher, or increase the thick; /archives//html/Amps/2000-10/msg00703.html (10,040 bytes)
18. SV: [AMPS] Portable linear using a DAF? (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Tue, 31 Oct 2000 15:36:47 +0200; The ICOM switchers are amongst the worst, read about it in recent issues of QST, despite ICOM's advertising pull.... On the other hand, some of the third party SMPSUs had spectrum performance not muc; /archives//html/Amps/2000-10/msg00704.html (8,306 bytes)
19. [AMPS] Portable linear using a DAF? (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Tue, 31 Oct 2000 10:52:48 EST; On Mon, 30 Oct 2000 21:55:51 -0500 "Tom Rauch" <w8ji@contesting.com> writes: Hi Tom, Keep up the good work! up the The 19th harmonic of 100KHz (first thing you have to worry about; on 160 meters) is; /archives//html/Amps/2000-10/msg00707.html (11,668 bytes)
20. SV: [AMPS] Portable linear using a DAF? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 31 Oct 2000 17:40:40 -0500; We were talking about the supply that fits inside the rig, not the external PS's which are not as well filtered or shielded. 73, Tom W8JI w8ji@contesting.com -- FAQ on WWW: http://www.contesting.com; /archives//html/Amps/2000-10/msg00710.html (8,026 bytes)

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