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81. Re: [Amps] Help with HL2200 6 meter conversion (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 22 Jan 2011 13:14:08 -0500; Absolutely! The coil's field will induce current in any conductive surface it impacts. By moving the coil closer to the top cover you increase shunt capacitance across the coil effectively increasin; /archives//html/Amps/2011-01/msg00235.html (13,021 bytes)
82. Re: [Amps] Why no 28 MHz (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 26 Jan 2011 00:48:59 -0500; Except for those amplifiers that use a microprocessor controller with frequency counter. The controller can be programmed to lockout when detecting RF between 26 and 28 MHz. If the amplifier is also; /archives//html/Amps/2011-01/msg00299.html (10,593 bytes)
83. Re: [Amps] GI-46B in TL-922 (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 26 Jan 2011 13:16:32 -0500; He may not have changed the heatsink. From documentation on the tube: What you describe a "the superior GI46 heatsink" is shown as "variant I." sounds like "variant II" is the more common. 73, ... J; /archives//html/Amps/2011-01/msg00320.html (10,167 bytes)
84. Re: [Amps] CODAR Technology Inc. (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 26 Jan 2011 16:29:34 -0500; Alpha 76 data here: http://bama.edebris.com/manuals/alpha/76a/ 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mail; /archives//html/Amps/2011-01/msg00329.html (7,934 bytes)
85. Re: [Amps] OM3500A (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 26 Jan 2011 22:53:37 -0500; I suspect one would be ahead to purchase the OM2500A since is has the same automatic controls and is better matched to US power limits. I think the issue is more that the US amplifier approval proce; /archives//html/Amps/2011-01/msg00354.html (12,989 bytes)
86. Re: [Amps] AL-811 & 572's (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 09 Feb 2011 22:47:17 -0500; I suggest you download the AL-811 and AL-811H from the Ameritron web site then compare schematics/parts lists. That is what any other person would need to do to answer your question. If the schematic; /archives//html/Amps/2011-02/msg00077.html (14,394 bytes)
87. Re: [Amps] WARNING! W4RT (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 14 Apr 2011 13:17:59 -0400; That's a terrible statement. There are a large number of sellers who operate e-mail based businesses out of their home as a "second job". In general they do not want "customers" showing up on their; /archives//html/Amps/2011-04/msg00425.html (11,949 bytes)
88. Re: [Amps] VL-2000 (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Tue, 10 May 2011 19:58:06 -0400; That's under rated ... with eight VRF-2366 the amplifiers should be capable of 2 KW output. The pictures of the two amplifier modules look like updated versions of the Helge Granberg "EB104" design; /archives//html/Amps/2011-05/msg00041.html (8,047 bytes)
89. Re: [Amps] 3cx400A7 and 8877 (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 21 May 2011 21:15:24 -0400; Not by a long shot! The 8874 is also known as a 3CX400A7 it is rated for only *half* the plate dissipation as the 3CX800A7. The 3CX800A7 also has significantly higher input capacitance in grounded g; /archives//html/Amps/2011-05/msg00185.html (9,845 bytes)
90. Re: [Amps] MRFE6VP Datasheet (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 22 Aug 2011 00:39:00 -0400; Since the devices were designed for broadcast television applications, I suspect they are designed for AB operation and the pulse rating is a way of trying to prevent application designers from pushi; /archives//html/Amps/2011-08/msg00136.html (11,346 bytes)
91. Re: [Amps] MRFE6VP Datasheet (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 24 Aug 2011 11:49:42 -0400; CW is only a 50% duty cycle if one is transmitting a string of dits. For alternating dits and dahs, the duty cycle is 66% (on for four dot periods and off for two dot periods). When one moves to tex; /archives//html/Amps/2011-08/msg00163.html (12,967 bytes)
92. Re: [Amps] ICOM PRO III QSK (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 09 Dec 2011 10:12:31 -0500; I don't have the link at hand or time to go looking for it right now but I've seen a rather extensive examination of T/R switching that shows the Icom rigs generally hot switch on returning to receiv; /archives//html/Amps/2011-12/msg00076.html (8,250 bytes)
93. Re: [Amps] ICOM PRO III QSK (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 09 Dec 2011 11:01:59 -0500; The study I saw (not the AD5X article) was not limited to the IC-7000. The "premature release" applied to all of the "small" radios 706/7000 as well as several of the full size radios - including 77; /archives//html/Amps/2011-12/msg00080.html (11,070 bytes)
94. Re: [Amps] ICOM PRO III QSK (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 09 Dec 2011 12:40:24 -0500; Yes, that's one of the sites I was looking for. You will notice that in all of the Icom radios shown, *including* the IC-746Pro and 756Pro, the HSEND line (cyan in the scope pictures) went high betw; /archives//html/Amps/2011-12/msg00083.html (13,270 bytes)
95. Re: [Amps] PRO III and ALpha 76 (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 10 Dec 2011 23:40:26 -0500; I would not drive any vacuum relays from an Icom ACC jack without a delay on break circuit unless I never planned to use QSK. The ACC jack will release 3 to 10 ms before the transceiver stops making; /archives//html/Amps/2011-12/msg00089.html (9,929 bytes)
96. Re: [Amps] ICOM PRO III QSK (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 11 Dec 2011 13:47:08 -0500; HSEND *is* the ACC output. HSEND = HF SEND on the rigs with 144 MHz and higher as they also have a VSEND (VHF SEND), typically for 144 and 430 MHz. For the HF or HF and 50 MHz only transceivers the; /archives//html/Amps/2011-12/msg00095.html (9,787 bytes)
97. Re: [Amps] FWD: Ham Radio Amp - $8500 (Louisville Ky) 3CX10000-a7 (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 05 Apr 2012 14:31:56 -0400; More likely since he also says "very little drive" the 4-400 is used in a grid driven driven configuration as a driver. That would be about right for 300W or so of carrier power to drive the 3CX-100; /archives//html/Amps/2012-04/msg00061.html (10,665 bytes)
98. Re: [Amps] Expert Amps 2K-FA: Any Opinions ? (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 25 Apr 2012 09:37:18 -0400; The so called SO2R capability is problematic for most conditions as it uses a separate multiband antenna for the non transmitting radio. It does not work well with the typical antenna system containi; /archives//html/Amps/2012-04/msg00235.html (9,997 bytes)
99. Re: [Amps] Expert Amps 2K-FA: Any Opinions ? (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 25 Apr 2012 13:55:57 -0400; Instead of providing two sets of antenna ports and routing the "second" (unselected) exciter around the amplifier, the Expert-1K and 2K both switch the "second" radio to a single "SO2R Antenna" port; /archives//html/Amps/2012-04/msg00239.html (16,099 bytes)
100. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 29 Apr 2012 09:58:40 -0400; I don't believe that for a minute if you compare apples to apples. Most of the tube designs have been significantly "over engineered". That is, the tubes have excess plate dissipation for the power; /archives//html/Amps/2012-04/msg00255.html (10,818 bytes)

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