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1. Re: [Amps] Shunt Feed Tower Issues (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Tue, 2 Nov 2004 02:30:29 -0000; Would help if you told us abit more about the tower set up. How much capacity are you using to tune out the reactance? It may be possible (even easy) to rejig the feedpoint so that you are feeding at; /archives//html/Amps/2004-11/msg00013.html (9,744 bytes)
2. [Amps] GU84-B ratings (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Mon, 25 Oct 2004 20:31:49 -0000; Have seen a variety of designs using GU-84B with various anode voltages etc. Would appreciate any views about GU84 operating conditons for amateur HF SSB and CW service. Thanks and 73 Baz end Barry K; /archives//html/Amps/2004-10/msg00410.html (6,881 bytes)
3. [Amps] QRO : I am not making this up. (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Tue, 19 Oct 2004 19:16:11 -0000; A couple of years back I was working the ARRL 10m contest. A very rude Eastern Eu station with a very big signal kept calling me all over my QSOs so I ignored him. Basic behaviour modification techni; /archives//html/Amps/2004-10/msg00273.html (6,836 bytes)
4. Re: [Amps] 5 kw amps -- why? (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Tue, 19 Oct 2004 18:44:24 -0000; Well, I manged to fry a "1500W " commercially made ferrite balun with significantly less than 1500kW out, let alone 3kW plus. Since then have lived in peace with my homebrew coax solenoid baluns. 73; /archives//html/Amps/2004-10/msg00271.html (10,808 bytes)
5. Re: [Amps] orphan amp? (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Sun, 10 Oct 2004 01:51:58 -0000; In my experience, high band arcing does not occur if the unit is tuned correctly. The Pi-L needs more precise tuning than the Pi. If the thing is set up into a dummy load, and then set to the logged; /archives//html/Amps/2004-10/msg00124.html (10,485 bytes)
6. Re: [Amps] Linearity metering (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Fri, 8 Oct 2004 14:39:42 -0000; There was an article on this topic in QST, back in 70s as I recall. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND ph/fax 64-9-372-; /archives//html/Amps/2004-10/msg00093.html (9,156 bytes)
7. Re: [Amps] orphan amp? (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Fri, 8 Oct 2004 05:02:49 -0000; Originally built in Canada, design sold to US Company who manufactured for a while. I have Canadian job. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Isl; /archives//html/Amps/2004-10/msg00085.html (8,285 bytes)
8. Re: [Amps] orphan amp? (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Fri, 8 Oct 2004 05:00:13 -0000; I have aViewstar PT2000A. Have run it very successfully for nearly 10 years. Has also been run by guest ops with no problems. Mainly CW contest work and hamming around. Bought it second hand. Problem; /archives//html/Amps/2004-10/msg00084.html (10,225 bytes)
9. Re: [Amps] bias for 3cx3000 (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Tue, 5 Oct 2004 08:51:43 -0000; The original question, as I read it, was about a technique to set the bias for a power tube. A cheap and easy way to do this is to put a power transistor in series with the cathode, and vary the Vcb; /archives//html/Amps/2004-10/msg00045.html (10,199 bytes)
10. Re: [Amps] bias for 3cx3000 (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Mon, 4 Oct 2004 01:58:50 -0000; Stan, Sounds to me like you are overdetermining things a bit. Seems to me that if a suitable power transistor is placed in the cathode circuit, then the voltage drop across the pass transistor can be; /archives//html/Amps/2004-10/msg00027.html (9,119 bytes)
11. Re: [Amps] output ckts. (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Mon, 20 Sep 2004 02:00:03 -0000; National put out multiband tanks along lines of the Z match, covered 3.5-30 no switches. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEA; /archives//html/Amps/2004-09/msg00343.html (9,144 bytes)
12. Re: [Amps] Filtering capacitor in a HV PS (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Wed, 18 Aug 2004 19:19:18 -0000; With respect, this is out of the dark ages. Look for www.duncanamps.com ( I think). There you will find a computer programme that permits you to model any power supply you can visualise and check reg; /archives//html/Amps/2004-08/msg00208.html (10,535 bytes)
13. Re: [Amps] 20kw Dummy load? (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Sun, 15 Aug 2004 01:13:04 -0000; Carbon resistor and dry ice.....(or maybe it would turn into a superconductor) 73 Baz end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND ph/fax; /archives//html/Amps/2004-08/msg00129.html (11,181 bytes)
14. Re: [Amps] Where to get Lg Zeners? (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Fri, 6 Aug 2004 05:14:36 -0000; wrap a power transistor around low watt zener to get desired rating. cheaper, better. 73 barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAN; /archives//html/Amps/2004-08/msg00048.html (8,054 bytes)
15. Re: [Amps] FL2100 (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Fri, 2 Jul 2004 03:40:47 -0000; May be dirty changeover relay. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND ph/fax 64-9-372-5161 www.waiheke.co.nz/signal.htm --; /archives//html/Amps/2004-07/msg00008.html (7,899 bytes)
16. Re: [Amps] What to do with tubeless sweep tube FL2000 ? (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Sun, 27 Jun 2004 17:18:23 -0000; Somewhere there is a website giving details of substitution of single transmitting tube into FL series amp. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke; /archives//html/Amps/2004-06/msg00133.html (9,973 bytes)
17. Re: [Amps] Transformer frequency differences (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Sat, 22 May 2004 06:44:08 -0000; Presumably the input voltage was higher. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND ph/fax 64-9-372-5161 www.waiheke.co.nz/sign; /archives//html/Amps/2004-05/msg00196.html (7,872 bytes)
18. Fw: [Amps] one people, separated by a common language (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Mon, 26 Apr 2004 04:42:38 -0000; Heath Robinson was an English cartoonist and illustrator widely syndicated in the 20s, 30s and 40s. Typical cartoon showing "Professor Brainstawm" operating a weird device cobbled together to achieve; /archives//html/Amps/2004-04/msg00208.html (8,499 bytes)
19. Re: [Amps] Re: Drake L7 newbie (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Fri, 26 Mar 2004 16:00:03 -0000; Am sure there is stuff on this in the Amps archives. Years back I had an L-4. The original power supply is feeble. Built it a new one giving around 3.3kV no load. Cannot remember the numbers, but out; /archives//html/Amps/2004-03/msg00287.html (11,363 bytes)
20. Re: [Amps] Step start resistors (score: 1): Author: "Barry Kirkwood" <bjk@ihug.co.nz>; Date: Wed, 7 Jan 2004 20:57:39 -0000; Guess value of surge limiting resistor is an empirical question, start with high value, observe response on scope.... Thought : use of incandescent lamp as resistor. Understand that tungsten filament; /archives//html/Amps/2004-01/msg00080.html (11,626 bytes)

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