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121. Re: [Amps] TL922 Power Plugs (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 5 Nov 2009 09:15:10 +0200
This is true! The point to watch, in my opinion, is to take the branch out from the main panel BEFORE the GFI, if used. A local GFI can then be added at the remote location and the local ground strap
/archives//html/Amps/2009-11/msg00063.html (11,000 bytes)

122. Re: [Amps] PSU design question (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Sat, 7 Nov 2009 07:55:38 +0200
Actually it's simple: you measure the voltage drop of the plate current through that resistor. If the current is in the hundreds of mA range all you need is a couple of ohms to get a few hundreds of
/archives//html/Amps/2009-11/msg00097.html (9,366 bytes)

123. Re: [Amps] Stripline design (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 16 Nov 2009 11:54:36 +0200
Hi guys: I think I have on the machine a piece of software that can help calculate a strip line. If anybody's interested contact me. 73: Alex 4Z5KS --Original Message-- From: amps-bounces@contesting.
/archives//html/Amps/2009-11/msg00188.html (10,457 bytes)

124. Re: [Amps] Right Angle UHF Connector (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 23 Nov 2009 09:34:39 +0200
Also "Trumpeter" makes them and have an online catalog. Just Google for it. Alex 4Z5KS This is what you are looking for: http://export.farnell.com/amphenol-rf/83-1ap-ug-646-u/rf-coaxial-adapter/dp/ 1
/archives//html/Amps/2009-11/msg00237.html (9,193 bytes)

125. Re: [Amps] High Voltage wire (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 2 Dec 2009 09:12:41 +0200
Try to get some copper core ignition wire at an auto electrician shop. It should be good to several amps, it about 40 mils in diameter. Alex 4Z5KS Aloha All, I am looking for about 2 ft of High volta
/archives//html/Amps/2009-12/msg00030.html (8,882 bytes)

126. Re: [Amps] Dummy Loads & Wattmeters (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 3 Dec 2009 09:50:23 +0200
Guys: +/- 10% equals 0.4dB error. I don't know of many general purpose instruments that are better than +/- 1dB which is about 20%. Don't go too far. The Air Force and the army use either Birds or Ph
/archives//html/Amps/2009-12/msg00068.html (11,862 bytes)

127. Re: [Amps] Dummy Loads & Wattmeters (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 3 Dec 2009 23:15:53 +0200
...a very old method was to use a thermocouple heated by a resistor equal to the load (usually 50 ohms). Then the thing was heated with DC until the thermocouple's output equaled the RF generated sig
/archives//html/Amps/2009-12/msg00087.html (10,016 bytes)

128. Re: [Amps] Dummy Loads & Wattmeters (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 3 Dec 2009 10:56:46 +0200
Well, it's bound to! Carborundum is the name of the material also! It is a crystalline substance and most of these exhibit some non linearities. No wonder it's an harmonic generator. Alex 4Z5KS Not e
/archives//html/Amps/2009-12/msg00108.html (10,219 bytes)

129. Re: [Amps] OM power power supply design (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 10 Dec 2009 08:50:28 +0200
Yees!! This is an FB configuration. I have one operating in conjunction with a 4-1000 at the 1kW level and it works beautifully. It rids you of bleeder resistors and high voltage capacitors. It was o
/archives//html/Amps/2009-12/msg00258.html (9,344 bytes)

130. Re: [Amps] OM power power supply design (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 10 Dec 2009 09:23:29 +0200
First, mine works for about 15 years and during this time burned out 2 BY130 diodes . Second, usually the secondaries are stacked above the primary winding. So that the upper ones have more layers of
/archives//html/Amps/2009-12/msg00259.html (10,846 bytes)

131. Re: [Amps] OM power power supply design (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 10 Dec 2009 09:26:34 +0200
They most definitely are NOT! Actually, you have 8 power supplies, separate and insulated from one another and with their outputs connected in series. Think of 8 350 volts DC sources , and then visua
/archives//html/Amps/2009-12/msg00260.html (9,858 bytes)

132. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 16 Dec 2009 08:51:31 +0200
I bought for mine a good sized blower, installed it outside of the shack and routed the air through a clothes dryer hose to the amplifier. The hose comes in a kit, complete with a flange to be attach
/archives//html/Amps/2009-12/msg00367.html (9,258 bytes)

133. Re: [Amps] Response the "QSK switching time" (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sat, 19 Dec 2009 10:18:37 +0200
There's one more reason why there's need of such a high voltage, on the order of 1000VDC on the diodes and not only on the transmit diode! When back biased a diode exhibits a varactor effect: it acts
/archives//html/Amps/2009-12/msg00484.html (14,076 bytes)

134. Re: [Amps] which HV connector to use? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 15 Jan 2010 17:46:47 +0200
Guys, we played around with this a while ago! Use ignition wire - copper, NOT carbon core- and wire it point to point if you're afraid of connectors. It's rated to about 20 kV and easily handles 1 or
/archives//html/Amps/2010-01/msg00203.html (9,894 bytes)

135. Re: [Amps] Chimney's (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 15 Jan 2010 17:54:41 +0200
You can also take a glass jar with the appropriate internal diameter, wrap around the side a shoe lace soaked in lamp oil, light it. When spent just pour a spoon of cold water over the glass: it will
/archives//html/Amps/2010-01/msg00204.html (10,110 bytes)

136. Re: [Amps] Amps for sale...maybe (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 17 Jan 2010 20:18:17 +0200
10 years and in warranty? Alex 4Z5KS Glenn you have to be specific. Spare parts - what part(s), how old is your amp, is it warranty or purchase. Product support - who have you tried to contact, by wh
/archives//html/Amps/2010-01/msg00244.html (14,099 bytes)

137. Re: [Amps] Source for large purchase of toroids? (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Sat, 23 Jan 2010 11:06:02 +0200
Bytemark Alex 4Z5KS Does anyone have a "best" (least expensive) source for purchase in bulk of toroids, etc??? thanks 73 chas k5dam Houston, TX _______________________________________________ Amps ma
/archives//html/Amps/2010-01/msg00282.html (8,436 bytes)

138. Re: [Amps] Source for large purchase of toroids? (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Sat, 23 Jan 2010 20:09:13 +0200
Yesss! That's why I mentioned Bytemark: they market Amidon now! Alex 4Z5KS I haven't bought in large quantities but I've always had good service from Amidon, https://www.amidoncorp.com/ Regards, Gale
/archives//html/Amps/2010-01/msg00288.html (8,202 bytes)

139. Re: [Amps] HB amps - what you can build with no tools (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 2 Feb 2010 09:18:54 +0200
That was the Masonic spirit, guys! Alex 4Z5KS I was visiting a friend in MA who was doing some repair work to his house which was built by shakers over 200 years ago. There was a part of the inner wa
/archives//html/Amps/2010-02/msg00068.html (12,138 bytes)

140. Re: [Amps] Fleamarkets (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sat, 6 Feb 2010 20:18:17 +0200
Well, today, for the greatest part, manufacturers also add to the fire. A number of them don't supply schematics or information detailed enough for service or, else, you need all kinds of extenders o
/archives//html/Amps/2010-02/msg00147.html (17,788 bytes)

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