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Total 471 documents matching your query.

61. Re: [Amps] 3-500 / 4-400 cooling (09/10/2005) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 31 Jan 2006 08:48:28 +0000
That may have been the original intention, but other cooling methods may work as well. The "external anode" tubes have an interesting history as regards air cooling. Eimac developed the SK-600 air sy
/archives//html/Amps/2006-01/msg00757.html (12,023 bytes)

62. Re: [Amps] GS-35b grid current? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 31 Jan 2006 09:39:03 +0000
Everybody's welcome to download the user manual for the Triode Board, and the information you need is on page 12: http://www.ifwtech.co.uk/g3sek/boards A good value for full-scale on the grid meter i
/archives//html/Amps/2006-01/msg00758.html (7,063 bytes)

63. Re: [Amps] Hi Potting a 4-1000 (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 31 Jan 2006 14:14:54 +0000
In that case, you'd better go and gett'er. -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp
/archives//html/Amps/2006-01/msg00766.html (7,494 bytes)

64. Re: [Amps] T networks and harmonics (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 7 Feb 2006 08:03:44 +0000
If most of us can't measure our harmonic output levels, that is a strong argument for amateurs to design their transmitters to minimize them. A Pi-L network will have better harmonic suppression than
/archives//html/Amps/2006-02/msg00150.html (8,486 bytes)

65. Re: [Amps] Glass envelope (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 8 Feb 2006 08:06:22 +0000
Nothing? Tubes are typically pumped down to about 1E-8mmHg, which means that the "vacuum" space of an amateur-sized transmitting tube will contain well over a million free gas molecules. -- 73 from I
/archives//html/Amps/2006-02/msg00183.html (8,212 bytes)

66. Re: [Amps] Glass envelope (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 8 Feb 2006 11:50:21 +0000
I don't have any specific information (so this message is also being blind-copied to a couple of people who might know better) but my impression is that the getter in transmitting tubes is mostly int
/archives//html/Amps/2006-02/msg00186.html (9,827 bytes)

67. Re: [Amps] ALC (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 24 Feb 2006 08:33:24 +0000
The real problem is that ALC is badly misused. In a typical transceiver, the ALC loop is used for: 1. Power output control, typically from 100W down to <5W 2. Compensating for band-to-band variations
/archives//html/Amps/2006-02/msg00487.html (12,007 bytes)

68. Re: [Amps] QSK (okay, not QSK...) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 24 Feb 2006 10:06:20 +0000
In theory... but those active contesters aren't going to be doing all that keying by hand. The computer will be doing the bulk of it, and QSK is no help there. Most people wouldn't dream of trying to
/archives//html/Amps/2006-02/msg00488.html (10,637 bytes)

69. Re: [Amps] QSK (okay, not QSK...) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 24 Feb 2006 15:01:04 +0000
Sorry, that wasn't clear. What I meant to say was : "Most people wouldn't dream of trying to interrupt the other station's contest transmission before it's finished, because it probably won't work an
/archives//html/Amps/2006-02/msg00495.html (9,615 bytes)

70. Re: [Amps] more on the GS35b light TSPA (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 24 Feb 2006 20:59:16 +0000
I've handled that particular broken tube, and looked at it carefully with a magnifying glass. The photograph was taken by PA3CSG, who once sold a few HB GS-35B amps for 2m and 70cm. The tube was retu
/archives//html/Amps/2006-02/msg00519.html (8,956 bytes)

71. Re: [Amps] QSK (okay, not QSK...) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 25 Feb 2006 00:24:24 +0000
We're certainly a long way from all transceivers and all amps being automatically plug-and-play to give full QSK; but many of the problems can be overcome by simple modifications at the interface. Us
/archives//html/Amps/2006-02/msg00526.html (16,897 bytes)

72. Re: [Amps] QSK (okay, not QSK...) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 25 Feb 2006 14:26:19 +0000
It all depends how much character distortion you're prepared to tolerate, given that one dot at 50wpm is 30ms long. Many transceivers cannot do full QSK at anywhere near 50wpm either. This puts the s
/archives//html/Amps/2006-02/msg00554.html (8,768 bytes)

73. Re: [Amps] [BULK] - DIN stands for....? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 26 Feb 2006 08:09:55 +0000
Would you like to count the number of connector pins on the back of your Icom, and convert that into square yardage of phono jacks? Space them nicely apart for Swedish-American fingers :-) -- 73 from
/archives//html/Amps/2006-02/msg00579.html (9,178 bytes)

74. Re: [Amps] RE : DIN stands for....? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 27 Feb 2006 17:28:31 +0000
The Yaesu band data and PTT plug that Jos needs is the same 8-pin 'horseshoe' pattern as the transverter socket on the TS-830. Yaesu use several other DIN types as well. Icom rigs use the 'circular'
/archives//html/Amps/2006-02/msg00620.html (11,012 bytes)

75. Re: [Amps] Parallel Amp Operation (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 28 Feb 2006 15:28:03 +0000
Yes, it can be done. To keep the two sets of grid and anode current meter from interacting, each board needs a large diode in the HV-minus connection (another GI750) with the cathodes commoned to the
/archives//html/Amps/2006-02/msg00666.html (10,547 bytes)

76. Re: [Amps] HB amps (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 3 Mar 2006 07:29:50 +0000
An 813 only has 125W dissipation, so by today's standards they are small tubes. You'd need four to equal a single 3-500Z, which will glow just as nicely. A pair would be struggling to reach even the
/archives//html/Amps/2006-03/msg00033.html (8,354 bytes)

77. Re: [Amps] HB amps (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 3 Mar 2006 19:44:35 +0000
I don't dispute the raw output figures, or the ruggedness either; but you didn't address my point about "clean, linear output". How do the IMD levels at 600W output compare with a 3-500Z? -- 73 from
/archives//html/Amps/2006-03/msg00044.html (9,264 bytes)

78. Re: [Amps] A request from Portugal (Was: RE: testing 572 B tubes) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 4 Mar 2006 21:04:30 +0000
Along with these functional tests, has anyone looked at checking the vacuum quality by configuring the tube as an "ionization gauge"? Someone told me about this technique for checking small audio tub
/archives//html/Amps/2006-03/msg00075.html (9,433 bytes)

79. Re: [Amps] Pin Diodes (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 8 Mar 2006 16:22:21 +0000
For a very effective single-band solution using low-cost diodes, see: http://www.sm5bsz.com/pindiode.htm This switch will handle 2.5kW and is fast enough to hear the station's radar echoes: http://ww
/archives//html/Amps/2006-03/msg00202.html (10,145 bytes)

80. Re: [Amps] Pin Diodes (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 8 Mar 2006 17:11:20 +0000
Somebody wrote (sorry, the direct message didn't arrive here): There is also a circuit originated by K1KP, and publicized by K6XX, which does not need a high voltage rail. It works directly from the
/archives//html/Amps/2006-03/msg00209.html (9,321 bytes)

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