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81. Re: [Amps] filament instant heating query (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 15 Jun 2012 00:45:25 -0400; There are others on here who can probably explain this better than I, but... This is typically a problem with filaments that draw a lot of current. At turn on the resistance is a fraction of that onc; /archives//html/Amps/2012-06/msg00131.html (9,521 bytes)
82. Re: [Amps] Dummy Load Blues (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 15 Jun 2012 16:59:12 -0400; If it smells like oil it's normally oil. PCBs ... I've heard it described as a sharp or garlic smell. To me it was, just different than what oil or mineral oil smell like and I can't put a name to it; /archives//html/Amps/2012-06/msg00161.html (9,488 bytes)
83. Re: [Amps] Lines Voltage High (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 15 Jun 2012 19:19:08 -0400; For many years I was an instrument tech and did instrument calibration. I even worked in round robin tests traceable to the bureau of standards and helped develop some calibration standards. I still; /archives//html/Amps/2012-06/msg00170.html (12,003 bytes)
84. Re: [Amps] [ham_amplifiers] RE: filament instant heating query / simple remedy (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 15 Jun 2012 21:44:26 -0400; Pricey aren't they? <:-)) I have 3. One is a full socket complete with the brass mounting ring and chimney. The other two are honest sockets but without the mounting ring or chimney. The mounting rin; /archives//html/Amps/2012-06/msg00175.html (19,163 bytes)
85. Re: [Amps] Babying radios conclusion 2 (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 16 Jun 2012 00:45:49 -0400; The information is on the net and is fairly easy to find. I worked in the industry for over 26 years starting when it was in its infancy. I mentioned those Silicon wafers. When we stated they were be; /archives//html/Amps/2012-06/msg00194.html (19,129 bytes)
86. Re: [Amps] Alpha 78 (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 16 Jun 2012 11:07:02 -0400; The block is fine as long as you do not sand it, or create dust from it. IF you have the machine tools to create a new cooler to fit the BeO block the conversion can be done neatly. All I've seen wer; /archives//html/Amps/2012-06/msg00207.html (9,131 bytes)
87. Re: [Amps] filament instant heating query / simple remedy (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 17 Jun 2012 15:56:13 -0400; You don't need a microprocessor to control the triac. Just an RC network plus a diac. They are noisy as all get out while ramping up and you only need about 4 seconds for amateur HV supplies and even; /archives//html/Amps/2012-06/msg00233.html (9,954 bytes)
88. Re: [Amps] filament instant heating query / simple remedy (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 19 Jun 2012 15:47:08 -0400; Actually the pilot sits in the dark. Only the instruments have lights. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co; /archives//html/Amps/2012-06/msg00285.html (9,400 bytes)
89. Re: [Amps] 4CX1500B's -- worth using? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Wed, 20 Jun 2012 22:06:27 -0400; The DX-2sp is a great example of that with its Chinese version the 4CX1500B, the FU728F. Run it easy and it'll just loaf along. Run the legal limit on high duty cycle and the blowers will kick into h; /archives//html/Amps/2012-06/msg00315.html (11,908 bytes)
90. Re: [Amps] Acoustic Noise Comparison (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 21 Jun 2012 21:05:06 -0400; My "old" 76A is almost silent with no vibration in the cover. For those that do vibrate, a simple piece of tape on the top of the center partition should quiet it as it has to vibrate against somethi; /archives//html/Amps/2012-06/msg00364.html (11,677 bytes)
91. Re: [Amps] Coax for MHV connectors? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 24 Jun 2012 14:45:37 -0400; My choice would be "none of the above". I say that as do not like these particular cables except for low power RF. The 240 series be it LMR or CNT are too fragile and have a solid center conductor. I; /archives//html/Amps/2012-06/msg00401.html (9,503 bytes)
92. Re: [Amps] addendum to 8877 plate voltage post (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 30 Jun 2012 22:43:39 -0400; Hmmmm... Me thinks some one should reset the year on their computer from 2000 to 2012 73 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2012-06/msg00457.html (9,786 bytes)
93. Re: [Amps] latest amplifier wonder (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 06 Jul 2012 15:34:16 -0400; To run about 3600 out. IE 3600/.6=6000W In -3600 out = 2400W dissipation. He's driving that with 5W? <:-)) 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@conte; /archives//html/Amps/2012-07/msg00046.html (9,161 bytes)
94. Re: [Amps] Amplified TV Antenna (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 06 Jul 2012 18:29:29 -0400; I put a UHF antenna with remote preamp at roughly 90 feet about 10' below the tribander. Running QRO there no QRM. http://www.rogerhalstead.com/ham_files/tower39.htm At 90 feet it receives well out t; /archives//html/Amps/2012-07/msg00054.html (9,594 bytes)
95. Re: [Amps] Amplified TV Antenna (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 06 Jul 2012 19:42:50 -0400; I had one of those via Radio Shack. Rabbit ears worked better. I took it back. Maybe they've improved. You would if you run enough power. It'll go off and stay off.<:-)) 73 Roger (K8RI) _____________; /archives//html/Amps/2012-07/msg00055.html (11,605 bytes)
96. Re: [Amps] Amplified TV Antenna (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 07 Jul 2012 02:39:25 -0400; My experience is an antenna is an antenna is an antenna is an antenna. It makes no difference in the antenna type, they do not care whether the signal is analog or digital. there is no such thing as; /archives//html/Amps/2012-07/msg00078.html (14,664 bytes)
97. Re: [Amps] Roger, Roger, Roger (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 07 Jul 2012 18:49:15 -0400; I kinda knew that ahead of time<:-)) And here I thought that was just cheap construction. Barbed wire was too valuable to use for feed lines (we had cattle), but my dad and I worked as linemen on the; /archives//html/Amps/2012-07/msg00110.html (14,073 bytes)
98. Re: [Amps] Alpha 87A ownerS (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 10 Jul 2012 16:18:01 -0400; Certainly applies to Cars, boats, rigs, Cameras, and airplanes! 73 Roger (K8RI) <snip> _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co; /archives//html/Amps/2012-07/msg00159.html (8,915 bytes)
99. Re: [Amps] Antennae (?) (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 12 Jul 2012 19:23:27 -0400; Sounds kinda fragile. I'd go for the 3CW20,000A7 myself. And there is a real reason for the ball on top. The prevent, or minimize corona discharge at those higher powers, even the legal limit on a mo; /archives//html/Amps/2012-07/msg00177.html (9,142 bytes)
100. Re: [Amps] Silicone hose from Flex Technologies (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 20 Jul 2012 14:32:25 -0400; Why not do it the way the commercial amp builders do it. Take a piece of about 1/8" silicone rubber sheet, roll it into a tube of the proper size, and use Silastic RTV (TM) or any other RTV) and make; /archives//html/Amps/2012-07/msg00231.html (8,261 bytes)

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