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1. [Amps] electronic switching (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Sat Jun 21 09:43:00 2003; Didn't Jos start this discussion by talking about switching the INPUT side of an amp with PIN diodes? 73, Pete N4ZR The World HF Contest Station Database was updated 17 June 03. Are you current? www.; /archives//html/Amps/2003-06/msg00165.html (8,993 bytes)
2. [Amps] Why hasn't solid state replaced tubes? (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Mon Mar 3 11:04:49 2003; This all makes sense to me, but I was a little uncertain about Tom's comments about tubes being on the way out. It seems to me (as a layman), that high-power solid state amplifiers for amateur use ha; /archives//html/Amps/2003-03/msg00054.html (8,986 bytes)
3. [Amps] MRF150 based 1500 watt amp design/cost (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Thu Mar 6 03:47:38 2003; As long as we're just designing this thing on paper, why wouldn't it make sense to design for a 50-ohm output impedance, forget the low pass filters, and instead include a low-pass-type autotuner per; /archives//html/Amps/2003-03/msg00232.html (8,788 bytes)
4. [Amps] Use of Manual T/R Switches (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Thu Mar 6 15:32:12 2003; There was actually a commercial TRswitch like this that a friend and I vaporized during an ARRL DX Contest back in the late 1950s, with a single-813 amplifier; if I recall correctly, it used a cathod; /archives//html/Amps/2003-03/msg00264.html (9,132 bytes)
5. [Amps] Use of Manual T/R Switches (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Thu Mar 6 16:31:14 2003; It was a class C amp which, as I recall, was totally shut off on receive. The thing worked FB as a QSK TR switch, while it lasted. 73, Pete N4ZR The World HF Contest Station Database was updated 23 F; /archives//html/Amps/2003-03/msg00267.html (9,065 bytes)
6. [Amps] AL-80B questions (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Sun Mar 9 09:06:22 2003; I replaced the Measures suppressors in an SB-220 with two conventional suppressors I bought from KM1H, and power output on 10M increased about 100 watts. The amplifier, which was quite well built by; /archives//html/Amps/2003-03/msg00363.html (9,349 bytes)
7. [Amps] SB-220 cap arc and the local broadcast station (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Sun Mar 9 12:59:46 2003; I think I've been told that when Heath switched to the higher voltage tune capacitor, they only succeeded in moving the arcing issue to the bandswitch. I think I'd rather arc the tuning cap occasiona; /archives//html/Amps/2003-03/msg00379.html (7,875 bytes)
8. [Amps] 3KV switching power supply (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Thu Mar 13 11:29:33 2003; If it swings from 3600V at 110 ma to 2500V at 1.1 amp, that doesn't sound terrific to me. something I'm missing here? 73, Pete N4ZR The World HF Contest Station Database was updated 23 Feb 03. Are yo; /archives//html/Amps/2003-03/msg00525.html (7,355 bytes)
9. [Amps] Silly idea? (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Mon Mar 17 21:32:03 2003; I believe many old 3-500Zs are in SB-220s, which are designed to this standard. No? 73, Pete N4ZR The World HF Contest Station Database was updated 23 Feb 03. Are you current? www.pvrc.org/wcsd/wcsds; /archives//html/Amps/2003-03/msg00655.html (8,070 bytes)
10. [Amps] High Input Swr SB-220 (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Wed Mar 26 12:50:08 2003; I don't doubt this is the optimum solution, but necessary? My TS-930 is perfectly happy driving my unmodified SB-220 on all bands including 12 and 17 meters. My Mark 5 is happy with it on every band; /archives//html/Amps/2003-03/msg00849.html (7,603 bytes)
11. [Amps] Capacitor checker (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Sun Mar 30 13:58:41 2003; According to the manual, the MFJ-259B will measure capacitance from a few pf to a few thousand, and inductance from less than .1uh to a maximum of 60 uh. 73, Pete N4ZR The World HF Contest Station Da; /archives//html/Amps/2003-03/msg00944.html (7,978 bytes)
12. [Amps] SB-220 meter switch needed (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Sun Feb 2 15:16:49 2003; I think I need to replace the meter switch on my SB-220. Does anyone know where to get an SP3T switch of the type originally used (which looks to have about a 60-degree spread between the 3 positions; /archives//html/Amps/2003-02/msg00014.html (6,570 bytes)
13. [Amps] SELL: 6 Bleeder Resistors 40K@100W (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Sat Feb 8 15:16:52 2003; OK, I give up, how can a wire-wound resistor be non-inductive? 73, Pete N4ZR The World HF Contest Station Database was updated 1 Feb 03. Are you current? www.pvrc.org/wcsd/wcsdsearch.htm; /archives//html/Amps/2003-02/msg00174.html (7,955 bytes)
14. [Amps] Non-inductive worewound resistors (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Sat Feb 8 22:50:23 2003; Thanks to everyone who replied. I learned something, though I must confess I'm still wondering how these particular ones were determined to be non (or near-non) inductive. 73, Pete N4ZR The World HF; /archives//html/Amps/2003-02/msg00193.html (6,588 bytes)
15. [Amps] SB220 Improvements (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Wed Feb 12 05:33:19 2003; Hmmm ... I have also read repeatedly on this reflector the recommendation to ground the grids directly, removing all of those components. In the absence of problems with my amplifier, I have not chan; /archives//html/Amps/2003-02/msg00276.html (8,544 bytes)
16. [Amps] Cheap 1500 Watt Amps? (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Fri Feb 14 08:14:04 2003; I suspect that an older AL-1200 may come as close as anything. 73, Pete N4ZR; /archives//html/Amps/2003-02/msg00320.html (7,209 bytes)
17. [Amps] 1920V @ 2.0 KVA transformer on eBay (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Fri Feb 14 08:29:07 2003; What sort of voltage/current would this transformer give in a voltage doubling circuit with a capacitor input filter? Sorry, but I really don't have a clue how to compute this, or even how to look it; /archives//html/Amps/2003-02/msg00321.html (7,468 bytes)
18. [Amps] Cheap 1500 Watt Amps? (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Fri Feb 14 08:29:16 2003; Now that I see the full question, and assuming you want to be set up to run all 6 at one time, why not do what W3LPL did -- 6 homebrew single-band amplifiers (he used 3-1000s) and a single humongous; /archives//html/Amps/2003-02/msg00322.html (7,322 bytes)
19. [Amps] RE: Problems with Heath SB-220 (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Wed Jan 22 17:25:24 2003; This is good advice -- there is such a signal and it leads the production of RF by a few milliseconds -- I forget the exact figure but K9MA told me about it. I use +12V to switch an FET that switches; /archives//html/Amps/2003-01/msg00184.html (7,369 bytes)
20. [Amps] up for your consideration (score: 131): Author: n4zr at contesting.com (Pete Smith); Date: Wed Jan 29 10:42:34 2003; Want to bet it's not type accepted either? 73, Pete N4ZR The World HF Contest Station Database has just been updated. Are you current? www.pvrc.org/wcsd/wcsdsearch.htm; /archives//html/Amps/2003-01/msg00286.html (7,705 bytes)

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