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61. [AMPS] "Work around" for Stupid Question! (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 3 Dec 2001 09:36:25 -0800; Link coupling eliminates the coupling capacitor altogether. Although it may not be practical for multi-band rigs, it is easy to implement for single band and perhaps adjoining bands. A Faraday shield; /archives//html/Amps/2001-12/msg00028.html (7,103 bytes)
62. [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 4 Dec 2001 08:34:58 -0800; "Much of the literature contends that a tuned input is better for IMD, however, that leads to possible requirements for neutralization and other complicating factors." Either you are reading the lite; /archives//html/Amps/2001-12/msg00079.html (11,348 bytes)
63. [AMPS] Bypassing Screen of 4cx800a for 50 MHz (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 18 Dec 2001 04:34:51 -0800; Steve asked: "This is an honest question, not a carping comment. Is bypassing the cathode to ground at -350V easier or less critical than bypassing the screen at +350V?" You were probably always caus; /archives//html/Amps/2001-12/msg00322.html (9,324 bytes)
64. [AMPS] Inductors (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 18 Dec 2001 04:55:38 -0800; Various means are available to vary the inductance over a limited range - without resorting to a large rotary inductor. How about this for a suggestion. Amplifier is built with small value variable C; /archives//html/Amps/2001-12/msg00325.html (8,678 bytes)
65. Fw: [AMPS] Inductors - correction (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 18 Dec 2001 06:29:02 -0800; At 4 am, I said: " Since each band would have a filter in the output, harmonic output could easily be greater than from the Pi-L." That should have been "harmonic output should easily be less than fr; /archives//html/Amps/2001-12/msg00327.html (9,306 bytes)
66. [AMPS] Grounding Screen of 4CX-1000 (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 18 Dec 2001 10:10:29 -0800; Real cheapskates (me - 25 years ago) can use this technique to mount a 4CX-1000 with no socket at all. This is useful because there are no cheap sockets for the 4CX-1000. Cut a hole for the tube and; /archives//html/Amps/2001-12/msg00330.html (9,689 bytes)
67. [AMPS] another myth on EMF (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 5 Nov 2001 12:35:53 -0800; Some people disbelieve that EMF is hazardous, but they must be blind. If you doubt this, just wait until high noon and look up at the sun. The EMF force is so strong that it will burn out your retina; /archives//html/Amps/2001-11/msg00055.html (9,060 bytes)
68. [AMPS] another myth on EMF (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 5 Nov 2001 22:09:50 -0800; A number of years ago, one of the local counties was considering an amateur radio tower ordinance. It probably would have sailed through smoothly, but one ham in particular annoyed his neighbors and; /archives//html/Amps/2001-11/msg00063.html (8,881 bytes)
69. [AMPS] Re: Dowels boiled in parafin (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 6 Nov 2001 11:40:04 -0800; Peter asks: "Which leads me to avoid wood where there's any RF on it or field in it. Has anyone ever used the old fashioned open wire line (unmatched) where the spacers are dowels boiled in paraffin; /archives//html/Amps/2001-11/msg00100.html (9,388 bytes)
70. [AMPS] Non-Inductive Carbon Resistors (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 6 Nov 2001 19:26:26 -0800; Non Inductive seems to be a relative term. In the late 30's, advertisements touted non-inductive resistors that could be safely used in power supplies with no problems. The clear implication is that; /archives//html/Amps/2001-11/msg00108.html (8,433 bytes)
71. [AMPS] SB200 Filament Voltage (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 7 Nov 2001 06:11:08 -0800; "A series resistor of 0.1 ohm - or if you prefer, 0.05 ohm in each filament leg. Easy way to get one is a bit of galvanised guy wire, split down to the individual strands, and a few inches at most of; /archives//html/Amps/2001-11/msg00124.html (8,158 bytes)
72. [AMPS] Tuning question (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 9 Nov 2001 10:49:15 -0800; I thought I had the perfect answer to operating at different power levels on my grounded grid amp. I found a surplus motorized variac. I had a big 0-250 volt meter on the panel, along with the plate; /archives//html/Amps/2001-11/msg00162.html (8,189 bytes)
73. [AMPS] alpha input swamp circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 12 Nov 2001 06:14:31 -0800; Steve asked: ". Has the shunt diode idea been tried in practice? Did it work above 10MHz? If yes, please let me know which brand and part # was used." In the late 50's, I think it was W6JAT, who work; /archives//html/Amps/2001-11/msg00189.html (8,279 bytes)
74. [AMPS] alpha input swamp circuit (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 12 Nov 2001 10:16:51 -0800; "1.6:1 is enough to cause significant power reduction in many radios." Since the Alpha 76A requires less than full output of the driver to reach full power output, power foldback is not relevant. As; /archives//html/Amps/2001-11/msg00199.html (8,694 bytes)
75. [AMPS] Coil Forms (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 12 Nov 2001 19:43:48 -0800; I ran a program written by K6STI, which computes coil losses and the results are interesting. Using 28 mhz, the highest frequency of the normal amp, I looked at a 4 turn coil made of #14 wire with 4; /archives//html/Amps/2001-11/msg00209.html (9,223 bytes)
76. [AMPS] Bandswitch parts? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 13 Nov 2001 05:36:18 -0800; <6-POSITION CERAMIC TAP SWITCH for 100 W BC-375 xmitter; 55 years after WW II, we are still living off surplus parts. Gassy 1625 tubes are quite useful to tune up an ARC-5. Use the glow just like a p; /archives//html/Amps/2001-11/msg00224.html (7,459 bytes)
77. [AMPS] swan mark-2 (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 14 Nov 2001 16:53:31 -0800; "Hi Folks Its me again i have never used a amp before so i am new at this.1st of all let me thank everyone who responded to my prior question.Still concerned abt interfacing this swan mark-1 to the k; /archives//html/Amps/2001-11/msg00248.html (8,591 bytes)
78. [AMPS] Screen voltage effects??? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 15 Nov 2001 05:57:11 -0800; "I'm wondering what the effect would be (linearity, distortion, etc) of running the screen at a different value than recommended in either/any class/mode of operation. I'll probably be experimenting; /archives//html/Amps/2001-11/msg00257.html (8,011 bytes)
79. [AMPS] Noises in electrolytic capacitors (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 2 Oct 2001 06:36:26 -0700; In aircraft, a dual ignition system is used - because your life depends upon it. Perhaps a good practice to adopt is to use a redundancy on the bleeder resistors. This would protect the capacitors fr; /archives//html/Amps/2001-10/msg00013.html (8,722 bytes)
80. [AMPS] Beer? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 8 Oct 2001 19:16:33 -0700; My biggest complaint about American beer is that it is served ice cold - thus you cannot tell the flavor whether it is good or bad. As far as I am concerned, there are no bad beers - except for my sc; /archives//html/Amps/2001-10/msg00200.html (8,408 bytes)

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