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41. Re: [Amps] Drake L4 Slow Relay (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Sat, 21 Nov 2009 13:34:27 -0800 (PST)
...Quite often the cause of the 'missing first dit' is that the exciter is making RF before the amp has switched over to transmit. The exciter sees a high SWR, and on rigs such as the 765, folds back
/archives//html/Amps/2009-11/msg00220.html (7,529 bytes)

42. Re: [Amps] Does Ameritron have the industrys worse customer service? (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Fri, 18 Dec 2009 10:29:45 -0800 (PST)
It is while since I called Ameritron but I have excellent experiences with their customer and technical support. (Rather less with the build quality of their products :-) I have just spent this morni
/archives//html/Amps/2009-12/msg00443.html (8,121 bytes)

43. Re: [Amps] Ameritron AL-80A Receive muted - relay? (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Sun, 27 Dec 2009 06:25:13 -0800 (PST)
I can't disagree with the advice to use the proper material for cleaning relay contacts. However: Many moons ago when I was a young sprog working for Cable and Wireless one of my less pleasant jobs h
/archives//html/Amps/2009-12/msg00552.html (9,136 bytes)

44. Re: [Amps] Hmmmm...Legal limit boiled the oil in the cantena (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Thu, 8 Apr 2010 08:49:23 -0700 (PDT)
"Standing waves on the antenna are necessary for it to radiate. They are not necessary to transfer power from the plate of the tube. I hope that Bill Orr book arrives soon. 73 Gary K4FMX" So that is
/archives//html/Amps/2010-04/msg00266.html (8,876 bytes)

45. Re: [Amps] Hmmmm...Legal limit boiled the oil in the cantena (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Fri, 9 Apr 2010 06:28:05 -0700 (PDT)
Actually, antennas need TRAVELLING waves to radiate. Standing waves are a secondary effect in some (just about all practical) antennas which cannot happen without travelling waves - think about it! A
/archives//html/Amps/2010-04/msg00307.html (10,289 bytes)

46. Re: [Amps] QSK-1500 chip (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 7 Jul 2010 17:42:50 -0700 (PDT)
Motorola ICs are now ON Semiconductor. From Wikipedia: "The company originated as Motorola, Inc.'s Semiconductor Components Group, and continues to manufacture Motorola's discrete, standard analog an
/archives//html/Amps/2010-07/msg00077.html (7,704 bytes)

47. Re: [Amps] construct ferrite "line isolator" (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 27 Oct 2010 08:41:15 -0700 (PDT)
I could not agree more with Ian, GM3SEK. Neil Muncy may well have 'discovered' the 'Pin 1 Problem' as related to pro audio equipment in 1995. He did not discover the need for proper (single point) gr
/archives//html/Amps/2010-10/msg00411.html (9,610 bytes)

48. [Amps] PL519 (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Tue, 15 Mar 2011 17:39:50 -0700 (PDT)
I have an old sweep tube amplifier (G3SRW 'Loudenboomer') which I forced into service last weekend following the failure of an MLA2500. (Yes, I know that (1) I should invest in some newer equipment,
/archives//html/Amps/2011-03/msg00117.html (8,096 bytes)

49. Re: [Amps] what is a 4 wire 240VAC service? (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Sun, 3 Apr 2011 17:27:37 -0700 (PDT)
There are a couple of things I don't understand: :-) (1) When it became clear, probably close to 100 years ago, that 120V was too low a voltage to efficiently power room (or tubes with handles) heate
/archives//html/Amps/2011-04/msg00051.html (7,125 bytes)

50. Re: [Amps] ICOM PRO III QSK (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Mon, 12 Dec 2011 09:33:15 -0800 (PST)
For what it's worth, the IC765 and the IC728 (at least) also have exactly the same problem - so it goes back quite a long way. 73 Roger VE3ZI _______________________________________________ Amps mail
/archives//html/Amps/2011-12/msg00098.html (8,130 bytes)

51. Re: [Amps] tetrode reverse screen grid current, (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Mon, 30 Jan 2012 06:47:41 -0800 (PST)
I would be most interested to see what circuitry Racal came up with. In the early 1970s I was responsible for the maintenance of a number a TA184 10kW auto-tune HF transmitters. These used a 4CX10000
/archives//html/Amps/2012-01/msg00290.html (7,289 bytes)

52. Re: [Amps] 572's (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Fri, 3 May 2013 06:17:31 -0700 (PDT)
"I have been running a Dentron MLA 2500, modified this way, for about three years (Not the QSK). with absolutely no problems. My concern with this mod was mounting the tube horizontally. This has not
/archives//html/Amps/2013-05/msg00037.html (8,115 bytes)

53. Re: [Amps] The Pin One Problem - Common Impedance Coupling (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Fri, 7 Jun 2013 12:54:19 -0700 (PDT)
I think that a technically correct generic name for the 'Pin 1 Problem' would be unwanted 'Common Impedance Coupling', and a bit of a search shows that this term has been quite frequently used. Of co
/archives//html/Amps/2013-06/msg00167.html (7,377 bytes)

54. Re: [Amps] The Pin One Problem - Common Impedance Coupling (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Fri, 7 Jun 2013 18:19:03 -0700 (PDT)
"No, it is NOT the correct description." Jim Brown presented a paper to the AES Convention in October 2003 entitled: "Testing for Radio-Frequency CommonImpedance Coupling (the "Pin 1 Problem") inMicr
/archives//html/Amps/2013-06/msg00171.html (8,128 bytes)

55. Re: [Amps] The Pin One Problem is NOT Common Impedance Coupling (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Sat, 8 Jun 2013 09:47:56 -0700 (PDT)
Jim Brown has ridiculed my suggestion that the 'Pin 1' problem is a subset of  the 'Common Impedance Coupling' problem. Strangely enough, this has not best pleased me, and I have in no way changed my
/archives//html/Amps/2013-06/msg00185.html (7,206 bytes)

56. [Amps] OTA TV (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Mon, 5 Aug 2013 14:08:23 -0700 (PDT)
We now have no OTA TV at all in this area. My understanding is that with the switch to digital the TV companies were permitted to switch off the OTA transmitters in markets of less than 250k. Althoug
/archives//html/Amps/2013-08/msg00047.html (7,139 bytes)

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