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21. [AMPS] Pi-Net math (score: 1): Author: realex@flash.net (bob alexander); Date: Thu, 12 Aug 1999 21:47:57 -0500; -- Hi Ian, I just pulled my 1998 ARRL Handbook off the shelf and opened it for perhaps the first time this year. I had never read the section on Pi-networks and the new "exact" method. I have never c; /archives//html/Amps/1999-08/msg00246.html (10,870 bytes)
22. [AMPS] 3 phase plate xfmr (score: 1): Author: realex@flash.net (bob alexander); Date: Sun, 04 Apr 1999 20:50:01 -0500; -- Dick, You can use it IF the delta primary is strapped externally on the transformer. The method I used on a plasma generator made by Henry required one primary winding be disconnected and the rema; /archives//html/Amps/1999-04/msg00062.html (7,289 bytes)
23. [AMPS] Parasitic suppressors/another question, (score: 1): Author: realex@flash.net (bob alexander); Date: Sat, 10 Apr 1999 19:15:39 -0500; -- I first worked on an SB220 as a Heathkit tech in the mid 70's. Since then I've owned, serviced, modified or for some reason had my hands inside 20 or 30 SB220s (not the 200 Rich has tested). In th; /archives//html/Amps/1999-04/msg00213.html (10,477 bytes)
24. [AMPS] Henry 3000D generator (score: 1): Author: realex@flash.net (bob alexander); Date: Fri, 05 Feb 1999 06:07:39 -0600; Hi Carsten, The Henry 3000D was designed for 300 Watts drive...the RF cabinet as used in plasma areactors came with a solid state 300 Watt "driver". There is a choice of two power supplies available; /archives//html/Amps/1999-02/msg00167.html (7,978 bytes)
25. [AMPS] More on B&W 850 as tank coil (score: 1): Author: realex@flash.net (bob alexander); Date: Mon, 08 Feb 1999 22:22:56 -0600; Jon, The inductance values you listed are better suited for a load impedance of around 2500 ohms and a Q of 10 on the lower bands, rising to around 18 on 10 meters. 73,Bob, W5AH -- FAQ on WWW: http:/; /archives//html/Amps/1999-02/msg00267.html (9,473 bytes)
26. [AMPS] SB-200 problem (score: 1): Author: realex@flash.net (bob alexander); Date: Thu, 24 Dec 1998 16:38:17 -0600; Howdy, I've been troubleshooting an SB200 and have gotten exactly nowhere. Measured operating conditions are: Plate voltage = 2100 indicated on front panel meter (I've measured 350 VDC +/- 10% across; /archives//html/Amps/1998-12/msg00387.html (8,256 bytes)
27. Fw: [AMPS] How to build the ultimate HF amplifier ? (score: 1): Author: realex@flash.net (bob alexander); Date: Mon, 02 Nov 1998 06:06:56 -0600; -- Why not switch in fixed values of C in place of a plate tuning cap and use a roller inductor for the "plate tune". Come to think of it, Henry radio did that a decade or two ago. 73, Bob, W5AH -- F; /archives//html/Amps/1998-11/msg00035.html (8,571 bytes)
28. [AMPS] Propeties of plastics at 10 GHz (score: 1): Author: realex@flash.net (Bob Alexander); Date: Wed, 12 Aug 1998 10:13:26 -0500; -- Howdy, Nylon, vinyl and delrin are poor absorbers at 10 GHz. They do work well if you want to change the phase of a signal @ 10 GHz. Cuming Corporation, 230 Bodwell St., Avon, Ma 02322 manufactur; /archives//html/Amps/1998-08/msg00109.html (8,424 bytes)
29. [AMPS] Properties of plastics at 10 GHz (score: 1): Author: realex@flash.net (bob alexander); Date: Thu, 13 Aug 1998 06:23:58 -0500; By coincidence I was working on a project involving use of plastics at near 10 GHz when the original post was made. Ill say again, Rich (and you) got it wrong. Nylon, vinyl, or delrin are poor absorb; /archives//html/Amps/1998-08/msg00116.html (8,627 bytes)
30. [AMPS] Technical Question #1 (score: 1): Author: realex@flash.net (bob alexander); Date: Wed, 20 May 1998 19:40:12 -0500; Karl, The main cause of damage to the band switch in the SB220 is Parasitics! These parasitics get into the fingers of the operator who is trying to tune the SB220 and causes him/her to rotate the ba; /archives//html/Amps/1998-05/msg00405.html (9,346 bytes)
31. [AMPS] SB-1000 RF choke -- results (?) (score: 1): Author: realex@flash.net (bob alexander); Date: Sun, 01 Mar 1998 20:25:35 -0600; Vic Rosenthal wrote: (lots of snips) Hi Vic, There are a couple of things I would try. First, check your power output using a different power meter to be sure you are not getting bad readings on 15 a; /archives//html/Amps/1998-03/msg00008.html (7,356 bytes)
32. [AMPS] Amplifier Output Levels (score: 1): Author: realex@flash.net (bob alexander); Date: Tue, 10 Mar 1998 19:09:46 -0600; Howdy, I have not paid much attention to the commercial amplifiers available since I left the Ham Radio business some 15 years ago. What can the new "legal limit" amps really do output wise? Im espec; /archives//html/Amps/1998-03/msg00160.html (6,845 bytes)
33. [AMPS] Power Output (score: 1): Author: realex@flash.net (bob alexander); Date: Fri, 13 Mar 1998 12:11:12 -0600; Howdy, Im still looking for info from owners about power output of the newer amps....especially the 4CX1600 amps. EMail me at w5ah@dxer.org 73, Bob -- FAQ on WWW: http://www.contesting.com/ampfaq.htm; /archives//html/Amps/1998-03/msg00242.html (6,468 bytes)
34. [AMPS] diode blocks (score: 1): Author: realex@flash.net (bob alexander); Date: Sun, 15 Mar 1998 10:44:23 -0600; Howdy, I recently got some hi-voltage diode modules that I believe came from K2AW's Silicon Alley although they are not marked with his call. The part number is HVPR10-MX12. Can anyone I.D. these for; /archives//html/Amps/1998-03/msg00303.html (6,560 bytes)
35. [AMPS] cooling of tank circuit (score: 1): Author: realex@flash.net (bob alexander); Date: Fri, 06 Feb 1998 19:38:56 -0600; Water cooling of the tank coil in RF decks used in plasma reactors for semiconductor manufacturing is not uncommon. One model I maintained some 20 yrs ago had a deionized water line connected to the; /archives//html/Amps/1998-02/msg00037.html (7,319 bytes)
36. [AMPS] SB220 power transformer (score: 1): Author: realex@flash.net (bob alexander); Date: Fri, 30 Jan 1998 19:49:31 -0600; Can anyone tell me the secondary voltage on the stock SB220 plate transformer? 73, Bob W5AH -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative reques; /archives//html/Amps/1998-01/msg00130.html (6,624 bytes)
37. [AMPS] What amp to build (score: 1): Author: realex@flash.net (bob alexander); Date: Sun, 14 Dec 1997 16:00:10 -0600; Jim, I would go with the 4cx5000 even though it will require more effort. I built a 3cx3000 amp a while back and had more problems than I expected. The 3000 wants lots of drive to really perform (ove; /archives//html/Amps/1997-12/msg00289.html (8,101 bytes)
38. [AMPS] Need info on my Alpha 77SX amp... What is Switch 10 do? (score: 1): Author: realex@flash.net (bob alexander); Date: Fri, 21 Nov 1997 06:05:07 -0600; Howdy, I believe that is the switch for either tuned input or untuned input. Bob, W5AH -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: a; /archives//html/Amps/1997-11/msg00303.html (8,957 bytes)
39. [AMPS] techno-babble (score: 1): Author: realex@flash.net (bob alexander); Date: Thu, 27 Nov 1997 07:37:25 -0600; Howdy, To paraphrase one of Tom's postings; between the two of them,the postings of Rich and Tom are 198% nonsense. Perhaps, if the King of Parasitics and the Master of Techno-babble got together we; /archives//html/Amps/1997-11/msg00375.html (7,548 bytes)
40. [AMPS] Re: Yaesu VL1000 Amp (score: 1): Author: realex@flash.net (Bob Alexander); Date: Mon, 06 Oct 1997 05:59:55 -0500; -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.cont; /archives//html/Amps/1997-10/msg00028.html (8,028 bytes)

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