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61. Re: [Amps] TL-922 question (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Tue, 29 Aug 2006 13:44:41 -0400; Tom, Not likely ... If the amp loads even at maximum capacitance on 80, the second section of the loading capacitor I getting switched in. You could not "get there" with the 40 meter values. when you; /archives//html/Amps/2006-08/msg00776.html (11,829 bytes)
62. Re: [Amps] NOS 4CX1000A test and reconditioning (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 8 Sep 2006 21:46:15 -0400; I have been Director of Engineering at four different television stations, had corporate responsibility for additional stations and visited countless transmitter sites over 20+ years. In every case; /archives//html/Amps/2006-09/msg00149.html (8,145 bytes)
63. Re: [Amps] NOS 4CX1000A test and reconditioning (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 9 Sep 2006 15:40:29 -0400; Paul, Most of the TV transmitters used indirectly heated filaments that had significant warm-up time. Timers were typically 10 to 15 minutes although manufacturers often specified the filament time a; /archives//html/Amps/2006-09/msg00157.html (9,478 bytes)
64. Re: [Amps] Change of E Mail Address (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 22 Sep 2006 10:37:56 -0400; Bob, Go to the address (web page) at the bottom of this e-mail. Go all the way to the bottom of the page and enter your old e-mail address. On the next page you will be able asked for your list passw; /archives//html/Amps/2006-09/msg00283.html (8,413 bytes)
65. Re: [Amps] Amplifier Rule Changes in the new R&O (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 14 Oct 2006 17:37:04 -0400; Probably harder than wiring around a bandstop filter and removing a stop in the bandswitch which seems to be the "standard" under the current rules. If a PIC or simple processor was programmed to co; /archives//html/Amps/2006-10/msg00120.html (10,871 bytes)
66. Re: [Amps] Amplifier Rule Changes in the new R&O (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 15 Oct 2006 13:27:00 -0400; If the controller controlled enough different aspects - like relay sequencing, bias switching, PTT enable - and the only PTT input was to the controller, it would be quite difficult (but not impossi; /archives//html/Amps/2006-10/msg00142.html (9,630 bytes)
67. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 15 Oct 2006 13:37:35 -0400; Gary, Most of the amplifiers of that day did not have the power supply and/or tube capacity to supply even a 6 dB peak to average ratio. In many cases the amplifier was doing the "speech processing"; /archives//html/Amps/2006-10/msg00144.html (9,697 bytes)
68. Re: [Amps] More information for "What NOT to buy".. (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Mon, 23 Oct 2006 22:01:40 -0400; Clint, You have gotten good advice ... but a couple more thoughts Almost any amplifier is a good starting amp but be prepared to make some changes and learn from the experience. 1) The MLA-2500 is to; /archives//html/Amps/2006-10/msg00259.html (10,090 bytes)
69. Re: [Amps] class "A" RF amp question (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Wed, 8 Nov 2006 15:37:48 -0500; Ken, Yes. In a class A amplifier the plate dissipation is maximum at zero power output. At zero output, the plate must dissipate 100% of the input power. At maximum output (1500 watts peak), the plat; /archives//html/Amps/2006-11/msg00128.html (9,383 bytes)
70. Re: [Amps] MLA2500 10 Meter Mod (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 17 Dec 2006 22:38:08 -0500; Bob, The original MLA-2500 predated the FCC restriction. The MLA-2500B came after the change in the rules - it deleted the high/low voltage switch on the transformer added a stop to the bandswitch an; /archives//html/Amps/2006-12/msg00124.html (8,242 bytes)
71. [Amps] Tom's Tubes ... (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Tue, 9 Jan 2007 15:22:56 -0500; Forwarded from the SouthEast DX Club reflector. I have not further information/details. K4JRS is k4jrs@aol.com 73, ... Joe, W4TV I have learned today that Tom of "Tom's Tubes" has passed away. I am t; /archives//html/Amps/2007-01/msg00078.html (6,753 bytes)
72. Re: [Amps] BAMA - somewhat OT (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 14 Jan 2007 10:45:11 -0500; Peter, Works just fine with Firefox but IE7 insists on a log-in to the FTP section when I try to download anything. That log-in causes a problem as it does not seem to want to do a normal anonymous l; /archives//html/Amps/2007-01/msg00137.html (8,012 bytes)
73. Re: [Amps] Loading SB-220 (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 3 Mar 2007 21:38:13 -0500; AF2C writes ... The difference between the CW and SSB positions in the SB-220 would not be significant if you had a choke resonance on one of the "WARC" bands. A series resonance will destroy the cho; /archives//html/Amps/2007-03/msg00042.html (8,243 bytes)
74. Re: [Amps] Postal Rates (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 28 Apr 2007 21:58:56 -0400; This is certainly off topic but ... Not true. see Postal Service Bulletin 2203A: http://www.usps.com/cpim/ftp/bulletin/2007/pb22203a.pdf IRCs will be $2.00. IRCs issued outside the US, Canada or Mexi; /archives//html/Amps/2007-04/msg00359.html (8,157 bytes)
75. Re: [Amps] ALPHAs and momentary power outages (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Mon, 16 Jul 2007 13:35:48 -0400; Alternatively, one might use a "UPS" that transferred only when power was off (technically a standby power supply). The "alarm" output could then be used to interrupt the PTT line to the amplifier so; /archives//html/Amps/2007-07/msg00271.html (10,142 bytes)
76. Re: [Amps] Alpha 76 PI-EL modification for WARC bands (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Tue, 18 Sep 2007 14:17:14 -0400; Be very careful using the Alpha 76 series amplifiers on 12 meters. ETO used a plate choke that was intentionally resonant around 26 MHz to prevent use of the amplifiers on 11 Meters. The amplifier h; /archives//html/Amps/2007-09/msg00203.html (9,180 bytes)
77. Re: [Amps] IMD (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Tue, 25 Sep 2007 21:06:37 -0400; Karl, The AL-1200 uses a 3CX1200A7 - not 572Bs. The only Ameritron amplifier using 572Bs is the AL-572 and it specifications are for 1300 W output with FOUR tubes. That's 325 watts per tube vs. 375 w; /archives//html/Amps/2007-09/msg00311.html (8,133 bytes)
78. Re: [Amps] Hy-Gain Hy-Tower Power handleing (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Wed, 21 Nov 2007 09:47:27 -0500; There are two 160 mods ... the first adds a 40 meter trap at the top of the tower section and a horizontal wire as an inverted "L." The second adds a loading coil in the 75 meter "drop wire" (in the; /archives//html/Amps/2007-11/msg00307.html (9,008 bytes)
79. Re: [Amps] Peter W Dahl Co (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 7 Dec 2007 15:43:11 -0500; Pete, Unfortunately, the business was more than just the amateur market (it provided a large number of aftermarket replacements for the broadcast market) but more specifically was heavily tied to the; /archives//html/Amps/2007-12/msg00040.html (8,337 bytes)
80. [Amps] PW Dahl Co. from ARRL (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 8 Dec 2007 15:27:03 -0500; This says it all: http://www.arrl.org/?artid=7889 Peter W Dahl Company, Manufacturers of Custom Transformers, Going Out of Business (Dec 7, 2007) -- The Peter W. Dahl Company in El Paso, Texas, will; /archives//html/Amps/2007-12/msg00081.html (7,343 bytes)

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