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141. Re: [Amps] HV Fuses (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 17 Feb 2010 10:15:48 +0200
Actually the filler in HV fuses is silica, not sand. The main purpose is to snuff off the arc that can generate a plasma short. It is found in heating elements in electrical boilers and kettles. If y
/archives//html/Amps/2010-02/msg00465.html (10,632 bytes)

142. Re: [Amps] Hotswitching issues 30s-1 (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 21 Feb 2010 10:28:46 +0200
Key the amplifier and send the PTT signal from it to the transceiver!!! Alex 4Z5KS How about using one of the simple Heil Foot switches, it has two switches and keys the Amp slightly before rig. This
/archives//html/Amps/2010-02/msg00600.html (9,945 bytes)

143. Re: [Amps] soft start, how to determine if needed? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 24 Feb 2010 10:39:56 +0200
As far as possible, USE ONE!!!!! First, the cold resistance of a tube's filament is as low as one tenth of the warm filament, so inrush currents can reach 10 times the operating value. Second, inrush
/archives//html/Amps/2010-02/msg00712.html (8,768 bytes)

144. Re: [Amps] soft start, how to determine if needed? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 25 Feb 2010 09:03:31 +0200
Yes, there is. The most endangered part are the rectifiers. The specification includes a current value called " non repetitive peak current", usually with a time limit of about a cycle or so. Use tha
/archives//html/Amps/2010-02/msg00737.html (13,951 bytes)

145. Re: [Amps] soft start, how to determine if needed? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 28 Feb 2010 09:58:56 +0200
By the way, an old trick that was used in tube type TV sets was to install a thermistor in series with the mains. It had a cold resistance of a few tens of ohms when cold, dropping to an oh or two af
/archives//html/Amps/2010-02/msg00759.html (23,602 bytes)

146. Re: [Amps] WD-40 is not.... (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 2 Mar 2010 08:30:37 +0200
Well, it repels everything else too, including women! Alex 4Z5KS Seems to work very well as a mosquito repellent when applied to the skin though. Mike There is a story being passed around from time t
/archives//html/Amps/2010-03/msg00044.html (13,688 bytes)

147. Re: [Amps] Good engineering (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 24 Mar 2010 09:22:29 +0200
Good engineering is a contest between engineers trying to design better and more foolproof equipment and the Universe producing bigger fools. So far, the Universe is winning! Seriously, nobody can pl
/archives//html/Amps/2010-03/msg00532.html (10,611 bytes)

148. Re: [Amps] Good engineering (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 24 Mar 2010 09:22:29 +0200
The grid dissipation is not so much of a factor, since it is inherent in high u tubes. That's what you pay for high gain. As long as you keep to class AB1 operation, you shouldn't have grid dissipati
/archives//html/Amps/2010-03/msg00533.html (10,740 bytes)

149. Re: [Amps] ripple in B+ supply (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 24 Mar 2010 09:22:29 +0200
Peak to peak. The DC voltage is also peak voltage of the secondary. That way you can compare apple with apples! Of course, you should measure it with a scope, or some peak reading, AC coupled detecto
/archives//html/Amps/2010-03/msg00534.html (8,214 bytes)

150. Re: [Amps] placement of RF choke bypass cap. (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 24 Mar 2010 09:22:29 +0200
Coaxial cable depends on an electromagnetic field whose end point are on the inside of the shield and the outside of the center conductor. For that matter, it's the same effect that keeps a parallel
/archives//html/Amps/2010-03/msg00535.html (10,608 bytes)

151. Re: [Amps] Why people don't build amps. (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sat, 27 Mar 2010 01:14:31 +0300
...as I happens, even transcevers are being built today! G5JXP has done a sterling job with designing a PIC controlled, DDS equipped and DSP operated with sterling results: the STAR. There are close
/archives//html/Amps/2010-03/msg00674.html (11,777 bytes)

152. Re: [Amps] ripple in B+ supply. (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sat, 27 Mar 2010 13:49:52 +0300
Since you cope with DC voltages, it makes sense to employ something close for the ripple and that average voltage. Fortunately, for the triangular wave form, the average is 1-3 of the peak to peak an
/archives//html/Amps/2010-03/msg00680.html (9,168 bytes)

153. Re: [Amps] 'good engineering' (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 28 Mar 2010 09:19:10 +0300
So very right! Years ago we used to say of an enclosure :" if it doesn't hold water, it won't keep RF in". This one reason why the military tend to use die cast plenums for the power stages of high p
/archives//html/Amps/2010-03/msg00705.html (14,092 bytes)

154. Re: [Amps] 'good engineering' (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 28 Mar 2010 09:19:10 +0300
Tell me guys. Who's idiot enough to build a 5 kilowatt amplifier and use it at the 1,5 kW level? Are we kidding ourselves or not? Alex 4Z5KS ORIGINAL MESSAGE: REPLY: If you really mean it, yes, I am.
/archives//html/Amps/2010-03/msg00706.html (9,708 bytes)

155. Re: [Amps] me not an idiot (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 29 Mar 2010 11:52:34 +0300
In a car, and any mechanical construction it's a must. You need that extra power to make you escape in an emergency. Just like "war power setting" in a war plane. But please explain tome what do you
/archives//html/Amps/2010-03/msg00745.html (9,573 bytes)

156. Re: [Amps] Over 1.5k = Idiot? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 31 Mar 2010 09:18:29 +0300
Probably not more than about 3 years, but most of the new ones won't last more than that any way. Somebody once told me that the department that takes care of limiting the lifespan of the cars at Jap
/archives//html/Amps/2010-03/msg00926.html (8,018 bytes)

157. Re: [Amps] 'Radio Transmitters" by Stoke (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 31 Mar 2010 09:53:59 +0300
Just for the record: the ONLY amplifier configuration that inverts phase is the common cathode! Soooo, when using the GG setup, you actually place a shielding grid between input and output, but you h
/archives//html/Amps/2010-03/msg00928.html (14,396 bytes)

158. Re: [Amps] Good engineering (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 31 Mar 2010 09:53:59 +0300
Well guys, I heard here in 4Zulu land about cars whose electronics were messed up by their own ignition. Things would act up on their own. Alex 4Z5KS I was wondering very much the same sort of thing
/archives//html/Amps/2010-03/msg00929.html (10,348 bytes)

159. Re: [Amps] gg (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 31 Mar 2010 09:53:59 +0300
That's good! The book I mean. I've been in this field for over 40 years and I have still have to find a better and more comprehensive book! Read and heed!!!! Alex 4Z5KS ORIGINAL MESSAGE: REPLY: Ok, i
/archives//html/Amps/2010-03/msg00930.html (9,326 bytes)

160. Re: [Amps] me not an idiot (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 31 Mar 2010 09:53:59 +0300
Driving fast or flying low? Alex 4Z5KS My cousin has a 24 foot pontoon boat in Chattanooga with a 200hp Black Max. I worry about the thing going airborne. It does pull skiiers well though !! Don WA4N
/archives//html/Amps/2010-03/msg00931.html (9,781 bytes)

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