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1. [Amps] RF Grid Current (score: 1): Author: g4ftc@hotmail.com (David G4FTC); Date: Tue, 24 Sep 2002 13:50:46 +0000; Perhaps some of the gurus can enlighten me. This is something which I've never seen referenced in any tube manufacturer's publications, but I've always wondered if it would ever be a potential proble; /archives//html/Amps/2002-09/msg00223.html (7,726 bytes)
2. [Amps] RF Grid Current (score: 1): Author: g4ftc@hotmail.com (David G4FTC); Date: Wed, 25 Sep 2002 11:01:13 +0000; No - the 82 amps isn't bonkers - similar calculations to that above made me curious as to current rating of the tube's internal structures. Even the ubiquitous 4CX250B will see some 20 amps of circu; /archives//html/Amps/2002-09/msg00238.html (8,301 bytes)
3. [Amps] 8171 (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Thu, 27 Jan 2005 18:52:04 +0000; Barrie, I'm the builder of the 6 metre 8171 amp referenced in Steve G8GSQ's posting. Although the output capacitance of 23pF may be considered high for a tube operating at VHF, when I built my 8171 a; /archives//html/Amps/2005-01/msg00537.html (9,320 bytes)
4. [Amps] Re: 8171 (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Fri, 28 Jan 2005 19:39:23 +0000; Hi Rich, Most of your questions are answered in the following pages: http://www.qsl.net/g4ftc/amplifiers/8171/8171_circuit_description/8171_circuit_description.htm http://www.qsl.net/g4ftc/amplifiers; /archives//html/Amps/2005-01/msg00544.html (8,495 bytes)
5. [Amps] 10dB and propagation (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 07 Feb 2005 17:29:29 +0000; I don't believe there is ANY transmitter on earth (amateur or pro) that could influence the ionosphere by causing a non-linear behavior in that. No one seems to have mentioned the Luxembourg Effect.; /archives//html/Amps/2005-02/msg00232.html (9,684 bytes)
6. [Amps] 10dB and propagation (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 07 Feb 2005 18:45:59 +0000; W2DTC wrote: Did you ever notice that when the Navy or Air Force wants to buy a new ship or airplane, that there are congressional meetings and many hurdles to overcome to get the funding? Does it th; /archives//html/Amps/2005-02/msg00237.html (8,915 bytes)
7. Re: [Amps] 10dB and propagation (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 07 Feb 2005 20:14:08 +0000; Hi Ken G4FTC worte: "HAARP was orginally conceived to generate ELF signals - if I recall correctly for communications with submarines while submerged." "and it only requires a relatively small amount; /archives//html/Amps/2005-02/msg00249.html (10,084 bytes)
8. [Amps] ebay and amps (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 11 Apr 2005 17:18:35 +0000; Interesting - I'm in the UK and the ebay profile shows: Feedback Score: 80 Positive Feedback: 100% Member since 09-Sep-03 in United States Item location: Eatonville, Washington I'd ask for the guy's; /archives//html/Amps/2005-04/msg00215.html (8,368 bytes)
9. [Amps] One PS, many amps (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Sun, 09 Oct 2005 16:54:55 +0000; I?m wondering if for triode amps the solution may be simply to isolate the DC path from the grid to the chassis of each amp so as to prevent one amp affecting the meter readings of another amp. See m; /archives//html/Amps/2005-10/msg00209.html (7,147 bytes)
10. [Amps] One PS, many amps (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 10 Oct 2005 18:32:55 +0000; Ian G/GM3SEK wrote: The decoupling ?C? will provide the RF return paths for the input and output but provide the DC isolation. But only at the risk of RF instability in each amp. Agreed - it would ne; /archives//html/Amps/2005-10/msg00250.html (8,883 bytes)
11. Re: [Amps] TWE T500M Linear amp (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Wed, 19 Oct 2005 20:13:56 +0000; I'm searching for a schematic for the subject's linear amp. It's from Trans World Electronics, a 500 Watts ¿out? solid state amp. Thanks for any advice . Best regards Guillermo - LU8EYW. Guill; /archives//html/Amps/2005-10/msg00470.html (7,789 bytes)
12. [Amps] TWE T500M Linear amp (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Thu, 20 Oct 2005 11:20:44 +0000; What I'm intrigued is about power rating; because it's fed from 13.6V guess it's a 500 watts input one, am I wrong? I can?t offer any advice on the MLA500/T500M but from what I can recall the DC curr; /archives//html/Amps/2005-10/msg00481.html (8,232 bytes)
13. Re: [Amps] harris rf103 (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 06 Feb 2006 18:16:23 +0000; Try http://bama.sbc.edu/harris.htm. 73s David G4FTC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-02/msg00134.html (6,910 bytes)
14. Re: [Amps] harris rf103 (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 06 Feb 2006 18:24:06 +0000; Oops! For some reason the link doesn't work. Go to http://bama.sbc.edu and then navigate to the Harris Page. 73s David G4FTC _______________________________________________ Amps mailing list Amps@co; /archives//html/Amps/2006-02/msg00136.html (6,857 bytes)
15. Re: [Amps] DIN stands for....? (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Sat, 25 Feb 2006 09:05:00 +0000; Only when it suits them. PS Don't mention Common Agricultural Policy! 73s David G4FTC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co; /archives//html/Amps/2006-02/msg00548.html (8,352 bytes)
16. Re: [Amps] Threads - was idiocy - perhaps it still is (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Tue, 14 Mar 2006 20:40:27 +0000; Ah - this was in fact a secret design feature - built-in automatic corrosion inhibitor! That's the reason why front Mini sub-frames never rusted. (and now someone will tell me otherwise!) David G4FT; /archives//html/Amps/2006-03/msg00375.html (8,290 bytes)
17. Re: [Amps] Trichloroethene (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Fri, 17 Mar 2006 18:26:49 +0000; Carbontetrachloride was banned here in the UK about 20 years ago. Trichloroethane was introduced to replace it as a cleaner/solvent. For many years Carbontetrachloride was used in small hand-held fir; /archives//html/Amps/2006-03/msg00506.html (9,475 bytes)
18. [Amps] W6PO 2m amplifier - input circuit adjustment (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Fri, 09 Jun 2006 17:28:16 +0000; Searching the amps archives, I know this question has been asked before but........ Apart from squeezing/expanding the coils of the input T network to obtain a satsifactory match, has anyone tried us; /archives//html/Amps/2006-06/msg00239.html (7,441 bytes)
19. Re: [Amps] W6PO 2m amplifier - input circuit adjustment (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Sat, 10 Jun 2006 16:37:06 +0000; Thanks for the replies. I did use the squeeze/expand method to initially test the amp using the "cold" method of placing a resisitor equal to the calculated tube drive impedance across the cathode an; /archives//html/Amps/2006-06/msg00253.html (7,604 bytes)
20. Re: [Amps] W6PO 2m amplifier - input circuit adjustment (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Sun, 18 Jun 2006 07:45:18 +0000; Hi Jeff, Thanks for the info. A problem with a Pi or PI-L network is that the values of the L's become increasingly at 2 metres small whereas the values of the L's in a T network are somewhat more ma; /archives//html/Amps/2006-06/msg00317.html (10,778 bytes)

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