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81. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: Robert Logan via Amps <amps@contesting.com>
Date: Thu, 30 Oct 2014 17:13:43 -0500
The word in the regs is "necessary ", not "desired". Bob Sent from my iPhone The problem is that "desired communications" is not defined! If the operator desires to have a 40 dB over S-9 (with S-9 de
/archives//html/Amps/2014-10/msg00262.html (13,750 bytes)

82. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: Robert Logan via Amps <amps@contesting.com>
Date: Fri, 31 Oct 2014 07:34:58 -0500
So am I. Sent from my iPhone The legal limit on AM is 1500 watts PEP, just as it is for all other modes. There is no 375 watt carrier "limit" set by the FCC. But it does work out to 375 watts of carr
/archives//html/Amps/2014-10/msg00274.html (16,721 bytes)

83. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Fri, 31 Oct 2014 15:22:57 +0000 (UTC)
The necessary power level required to carry out the desired communications is, again, dependent on just what "desired" means!  As such, the regulation has no meaning in technical terms. Until "desire
/archives//html/Amps/2014-10/msg00277.html (12,277 bytes)

84. [Amps] Conversion of repeater-type (Class C, FM-only) TE systems VHF brick amp to linear operation (score: 1)
Author: David Feldman via Amps <amps@contesting.com>
Date: Mon, 3 Nov 2014 15:37:28 -0800
Searching for info that would help guide me in modification of a TE systems VHF brick amp that was manufactured for repeater use (Class C) to enable linear (class AB) operation. This is probably a ma
/archives//html/Amps/2014-11/msg00001.html (7,428 bytes)

85. Re: [Amps] 572B - News? (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Fri, 7 Nov 2014 16:04:26 +0000 (UTC)
It is easy to home brew a socket for the Gi-7bT tubes.  There are some photographs of how I made sockets for a pair of those tubes that I used for my 160-meter amplifier at the following URL: http://
/archives//html/Amps/2014-11/msg00004.html (8,628 bytes)

86. Re: [Amps] 572B - News? (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Fri, 7 Nov 2014 22:40:00 -0500
Nope the mod changed the low voltage supply to a tripled to up the cutoff bias voltage Sent from AOL Mobile Mail <div id="AOLMsgPart_1_9e9ea427-fd25-4b38-83a5-75f4e3b51906" style="margin: 0px;font-fa
/archives//html/Amps/2014-11/msg00016.html (15,573 bytes)

87. [Amps] RF Probe (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Sun, 9 Nov 2014 03:57:00 +0000 (UTC)
I am in need of an r.f. probe for my Hewlett-Packard HP-3406A r.f. sampling voltmeter.  Any of these HP part numbers will work: 03406-66504 03406-62101 03406-62103 Not a boat anchor.  However, I do u
/archives//html/Amps/2014-11/msg00019.html (7,000 bytes)

88. Re: [Amps] AL80B power meter not working (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Fri, 14 Nov 2014 09:36:05 -0800
Ditto. 1N5711 = $0.50 each from Mouser, stk no 511-1N5711. The same thread was started on the world's largest ham forum... Bryan WA7PRC _______________________________________________ Amps mailing li
/archives//html/Amps/2014-11/msg00029.html (8,858 bytes)

89. [Amps] Long stored SB-220 (score: 1)
Author: Tony Brock-Fisher via Amps <amps@contesting.com>
Date: Mon, 24 Nov 2014 18:42:11 -0500
I recently acquired an SB-220 which has not seen power in 5 years or more. What's the consensus on powering up this beast - bring her up slow, reforming the caps, worry about gassy tubes; or just plu
/archives//html/Amps/2014-11/msg00041.html (7,261 bytes)

90. [Amps] WTB 25 pf doorknob caps (score: 1)
Author: Donald Fox via Amps <amps@contesting.com>
Date: Mon, 24 Nov 2014 21:00:00 -0800
Gents: I find myself looking for at least (8) 7.5kv 25 pf door knobs. Surplus Sales of Nebraska has them for $14 each. I was hoping to do better since I need so many. Feel free to contact me off list
/archives//html/Amps/2014-11/msg00043.html (6,702 bytes)

91. Re: [Amps] Holding a vacuum (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Wed, 26 Nov 2014 16:46:12 +0000 (UTC)
It depends!  There are certain tubes, like the 3-500Z, that are notorious for losing vacuum.  But, I have quite a number of glass tubes that were manufactured in the 1920s that are still fine. The ce
/archives//html/Amps/2014-11/msg00055.html (7,815 bytes)

92. Re: [Amps] Old Moto RF Decks (score: 1)
Author: mike via Amps <amps@contesting.com>
Date: Sun, 30 Nov 2014 16:35:47 -0500
The EME guys convert these to run a pair of 8877 tubes. They sell for $100 or so. Mike I have some of the old Motorola (Micor?) RF decks. I have both the VHF & UHF types. The 2 meter is running a pai
/archives//html/Amps/2014-11/msg00079.html (7,533 bytes)

93. Re: [Amps] Holding a vacuum (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Mon, 1 Dec 2014 13:32:19 -0500
Hi Karin. the direct answer is the tube will withstand application of the rated hv with only a few microamperes of leakage current showing. The non-destructive test method is use of a high voltage br
/archives//html/Amps/2014-12/msg00003.html (8,433 bytes)

94. Re: [Amps] Old Moto RF Decks (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Mon, 1 Dec 2014 22:08:32 +0000 (UTC)
The 8560A is basically a conduction cooled 4CX250B.  The Eimac specification sheet on the 8560A states that the characteristics are similar to, but not exactly the same, as the 4CX250B.  The differen
/archives//html/Amps/2014-12/msg00010.html (8,395 bytes)

95. [Amps] henry amp problem (score: 1)
Author: Douglas Johnson via Amps <amps@contesting.com>
Date: Thu, 4 Dec 2014 15:07:08 +0000 (UTC)
During the cw contest my henry 2-kd classic started to act up, no power output on 40-80 meters and after 3 or 4 seconds transmitting on 20 power drops to zero. 10 and are normal output . plate curren
/archives//html/Amps/2014-12/msg00020.html (7,748 bytes)

96. Re: [Amps] Linearization problem (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Thu, 4 Dec 2014 08:50:16 -0800
Hi Manfred, Directional coupler. 73 & Good morning Marv WC6W http://qsl.net/wc6w/ Subject: [Amps] Linearization problem To: amps@contesting.com Date: Thursday, December 4, 2014, 6:05 AM Attention to
/archives//html/Amps/2014-12/msg00023.html (11,411 bytes)

97. Re: [Amps] Linearization problem (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Thu, 4 Dec 2014 13:50:19 -0500
In the microwave world one would follow the coupler with a circulator and the energy reflected from the amplifier would dump into a dummy load. The coupler would then "see" a constant load and the co
/archives//html/Amps/2014-12/msg00029.html (8,870 bytes)

98. Re: [Amps] Linearization problem (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Fri, 5 Dec 2014 10:30:12 -0800
I sent this to Manfred direct as an attachment but, that doesn't go with the reflector. I found the source "on line" so, here is a link for any who are interested. www.measurement.sk/2009/S1/Laurinav
/archives//html/Amps/2014-12/msg00040.html (9,841 bytes)

99. Re: [Amps] Alpha 76 case screws (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Fri, 5 Dec 2014 23:16:16 +0000 (UTC)
Flat head screws most commonly fit countersunk holes with an 82 degree angle. Less common is 100 degrees, which is typically used to secure thin materials. While flat head screws are installed to be
/archives//html/Amps/2014-12/msg00041.html (9,979 bytes)

100. [Amps] Alpha 99 (score: 1)
Author: Kathy Bookmiller via Amps <amps@contesting.com>
Date: Wed, 10 Dec 2014 08:50:05 -0800
I am trying to sell for the widow of the owner an Alpha 99. serial number 990020073 with Peter Dahl transformer and external cooling fan. Original sales receipt. Very clean, non-smoking home. Tested
/archives//html/Amps/2014-12/msg00047.html (6,689 bytes)

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