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References: [ +from:km1h@jeremy.qozzy.com: 394 ]

Total 394 documents matching your query.

61. Re: [Amps] Old Moto RF Decks (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Mon, 1 Dec 2014 15:43:24 -0500
SSB IMD goes up rapidly above 300W per tube even with simplistic screen regulation. Be a good neighbor on the bands with those rather aged and obsolete designs (1947) that predate widespread SSB use.
/archives//html/Amps/2014-12/msg00008.html (9,607 bytes)

62. Re: [Amps] Holding a vacuum (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Mon, 1 Dec 2014 15:59:57 -0500
No, as I mentioned both seal leakage plus internal outgassing as possibilities. Carl KM1H Ah! Thanks, Carl. This does, however, raise another question: when read here about storage life of transmitti
/archives//html/Amps/2014-12/msg00009.html (13,346 bytes)

63. Re: [Amps] Old Moto RF Decks (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Mon, 1 Dec 2014 19:01:34 -0500
BUT, harmonics and IMD are two completely different animals. Now when is Freescale going to offer a 2-30 or 2-50 mHz device that has high efficiency and very low IMD at the same time and be targeted
/archives//html/Amps/2014-12/msg00012.html (9,325 bytes)

64. Re: [Amps] Old Moto RF Decks (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 2 Dec 2014 21:01:25 -0500
Manfred, I didnt become proficient in hollow state amplifier design by not extensively studying, and experimenting with linear circuits that were as strange in the 50-60's as SS is to many now. OTOH
/archives//html/Amps/2014-12/msg00015.html (12,145 bytes)

65. Re: [Amps] Alpha 76 case screws (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 5 Dec 2014 13:03:10 -0500
I believe the standard US angle is 82 degrees for non aircraft use. Metric is 100* Carl KM1H Does anyone know the type of screw used in the sides of the Alpha 76? It's a 6-32, stainless with some sor
/archives//html/Amps/2014-12/msg00038.html (8,930 bytes)

66. Re: [Amps] Linearization problem (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 5 Dec 2014 13:17:34 -0500
The typical phased vertical uses a 90 degree hybrid circuit which forces phase balance by dumping reflected RF into a dummy load. Carl KM1H In the microwave world one would follow the coupler with a
/archives//html/Amps/2014-12/msg00039.html (11,109 bytes)

67. Re: [Amps] Terrain Mapping for EZNEC ( Again ) (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 14 Dec 2014 21:22:17 -0500
Terrain Analyzer as part of the ARRL Antenna Manual CD maybe? Carl KM1H Several months ago, someone recommended a mapping program that looked at the near field ground around a tower to predict take-o
/archives//html/Amps/2014-12/msg00058.html (7,904 bytes)

68. Re: [Amps] THE SKINNY ON MY AL-82 (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 19 Dec 2014 16:56:11 -0500
Is he (YOU) SURE it was parasitics? More likely hot switching of the amplifier T/R relay. This causes LOTS of problems that folks THINK are parasites. After I install my QSK system into amplifiers, t
/archives//html/Amps/2014-12/msg00070.html (11,333 bytes)

69. Re: [Amps] THE SKINNY ON MY AL-82 (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 19 Dec 2014 21:28:44 -0500
-- ORIGINAL MESSAGE --(may be snipped) You get better suppression with the lower resistance since it further lowers the Q and broadens the frequency response. REPLY: So Mr Measures with his low Q ni
/archives//html/Amps/2014-12/msg00072.html (8,783 bytes)

70. Re: [Amps] THE SKINNY ON MY AL-82 (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 21 Dec 2014 20:17:09 -0500
You havent lived until you find a 47K that became 1-2 Meg which is quite common in many old receivers and sourced at only 200-250VDC as screen droppers. Over 50+ years of building and servicing tube
/archives//html/Amps/2014-12/msg00078.html (11,624 bytes)

71. Re: [Amps] Alpha 76 "SNAP" noise (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Mon, 22 Dec 2014 09:30:22 -0500
When was the last time the filter caps were replaced? Carl KM1H Greetings all, I have a 3 hole 76 that I recently "cleaned" with brush and vacuum. It tunes and runs very nicely with no bad reports ho
/archives//html/Amps/2014-12/msg00081.html (8,116 bytes)

72. Re: [Amps] THE SKINNY ON MY AL-82 (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 23 Dec 2014 21:07:45 -0500
I said Late 20's Jim! While I have several battery sets I just display a couple of them and havent bothered to get one going. My interest is AC powered and my oldest is probably 1927; most of my coll
/archives//html/Amps/2014-12/msg00085.html (14,279 bytes)

73. Re: [Amps] Alpha 76 "SNAP" noise (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 23 Dec 2014 21:10:20 -0500
HV electrolytics and their associated components John. Carl KM1H Sorry folks, are we talking about the string of smoothing electrolytics or a ceramic RF filter cap here? I'm curious about this as whe
/archives//html/Amps/2014-12/msg00087.html (9,504 bytes)

74. Re: [Amps] THE SKINNY ON MY AL-82 (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Wed, 24 Dec 2014 12:00:45 -0500
Im sorry to hear about Ron. Trying to locate the AMPS owner could be hard at times and you can easily unsubscribe by going to the bottom of this link. http://lists.contesting.com/mailman/listinfo/Amp
/archives//html/Amps/2014-12/msg00090.html (15,111 bytes)

75. Re: [Amps] L4B biasing (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 25 Dec 2014 10:28:54 -0500
If you are planning to use it as an AM linear at times running about 7-8V bias will be more efficient and not hurt SSB IMD. Ive been using my LK-500ZC that way for years and confirmed on a spectrum a
/archives//html/Amps/2014-12/msg00101.html (10,557 bytes)

76. Re: [Amps] L4B biasing (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 25 Dec 2014 17:04:33 -0500
You just might want to look at Eimac's spec sheet. http://frank.pocnet.net/sheets/140/3/3-500Z.pdf Carl KM1H A 3-500 amp does not need bias unless it is run at 3000 volts or above. 200 mills of idlin
/archives//html/Amps/2014-12/msg00103.html (9,281 bytes)

77. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 27 Dec 2014 21:21:44 -0500
600W PEP on SSB with poor to fair IMD, any more and it gets real bad. Screen and grid voltage regulation is very important. They are a late 1940's design prior to SSB popularity. Carl KM1H What is th
/archives//html/Amps/2014-12/msg00114.html (9,178 bytes)

78. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 27 Dec 2014 21:36:19 -0500
There are glass upper and base, glass base and ceramic upper and all ceramic 150A's. Only the all ceramic had the 250 ratings and more fins, Amperex had them marked 150A as well as 150A/7034.....same
/archives//html/Amps/2014-12/msg00115.html (10,390 bytes)

79. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 28 Dec 2014 11:00:32 -0500
He is asking about a PAIR of tubes in an amp he is looking at. One option there is that other tubes in the 4X150/250 family can be used that offer much better IMD For many a $700 Chinese 8877 is not
/archives//html/Amps/2014-12/msg00121.html (11,621 bytes)

80. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 28 Dec 2014 20:27:07 -0500
The 4CX250R was developed for high shock enviroments, military or civilian. The military version was the 7580W and a dual labeled pair was used in the Collins AN/URC-32 shipboard "transceiver" from t
/archives//html/Amps/2014-12/msg00130.html (12,875 bytes)

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