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241. Re: [Amps] Class E amd and MRF492 (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 09 Mar 2005 12:13:15 -0500
I have seen variations of the DAF that compared rectified output and input voltages to set control the screen grid. The question always remains what of the intermodulation products even though the en
/archives//html/Amps/2005-03/msg00238.html (9,818 bytes)

242. [Amps] Solitron Devices HV rectifiers (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Sun, 20 Mar 2005 14:21:59 -0500
Does someone have an old Solitron Devices rectifier catalog handy? I have some old HV rectifiers that are obsolete and data not available by normal means. 73 Bill wa4lav _____________________________
/archives//html/Amps/2005-03/msg00438.html (6,421 bytes)

243. Re: [Amps] Measuring RF Power (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 22 Mar 2005 15:41:50 -0500
The following is an example that I presented some time ago on AMPS. Hope it is useful again. The biggest problem is that for some reason the registration of the values in the columns do not line up w
/archives//html/Amps/2005-03/msg00499.html (12,703 bytes)

244. Re: [Amps] Measuring RF Power (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 22 Mar 2005 16:22:38 -0500
Now, how about the next example. RMS of a sine wave using only 4 samples but this time use 170 volts peak value and 144 ohms (100 watt light bulb). I have rounded the following to the nearest tenth t
/archives//html/Amps/2005-03/msg00504.html (9,373 bytes)

245. Re: [Amps] 4CX1000A for SSB?? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 24 Mar 2005 12:29:48 -0500
Ok, I just took a look at this and see where the problem is. With a resolution bandwidth of 3kHz the 3 order IMD products are masked by the real signal. For example if you should have a 14.2815 MHz s
/archives//html/Amps/2005-03/msg00544.html (10,410 bytes)

246. Re: [Amps] Measuring RF Power (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 28 Mar 2005 10:29:42 -0500
I think if we just package all the emails about this subject and keep the "package" attachment handy for the next time this comes up just send it to the person with the question instead of going thru
/archives//html/Amps/2005-03/msg00630.html (17,772 bytes)

247. Re: [Amps] Transistor amps (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 29 Mar 2005 11:12:24 -0500
I noticed that the efficiency of the 13.56 MHz amplifier is 85% max and the 27.12 MHz is 78%. Dropping down rapidly at higher frequencies. But all this efficiency would be lost if you linearize the a
/archives//html/Amps/2005-03/msg00693.html (14,591 bytes)

248. Re: [Amps] MLA-2500B Question (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 30 Mar 2005 10:06:45 -0500
Using an automatic antenna tuner and shunt capacitance to ground at the cathode is an interesting idea. I have not considered it. However, if the capacitive reactance is a fraction of the tubes input
/archives//html/Amps/2005-03/msg00722.html (10,582 bytes)

249. Re: [Amps] ID IOT IC powered station wanted for exciting new project! (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Fri, 01 Apr 2005 11:34:22 -0500
A few years ago a local UHF TV station gave our radio club their old TV transmitter to scavenge for parts. We did in a big way this was not long after 9/11 and my Father and I transporting the Klystr
/archives//html/Amps/2005-04/msg00018.html (10,749 bytes)

250. Re: [Amps] a common topic here tspa (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 07 Apr 2005 13:58:25 -0400
What is the boiling point of molten gold in vacuum? I assume it is lower in vacuum as with any liquid in a vacuum. It may be even more complex than that! 73 Bill wa4lav ______________________________
/archives//html/Amps/2005-04/msg00145.html (11,792 bytes)

251. Re: [Amps] a common topic here tspa (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Fri, 08 Apr 2005 09:15:52 -0400
Gold , lead and solder are very compatible. You can solder to gold in fact solder will dissolve gold just as it does silver. However, I suspect gold does not like to stick to molybdenum ( like solder
/archives//html/Amps/2005-04/msg00172.html (13,311 bytes)

252. [Amps] Richardson Seeking Global Monopoly? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 12 Apr 2005 16:53:56 -0400
If it is not bad enough that just about all power tubes are sold thru Richardson Electronics, now I see a headline that reads "Richardson Opens New RF/Microwave Office In Nanjing, China". From RF Glo
/archives//html/Amps/2005-04/msg00237.html (6,412 bytes)

253. Re: [Amps] Richardson Seeking Global Monopoly? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 13 Apr 2005 09:12:33 -0400
I have not looked at EIMAC/CPI 's home page for some time now. But it has changed. Before they referred to REL when ordering tubes right on the home page but I don't see that now. I wondered what has
/archives//html/Amps/2005-04/msg00254.html (7,679 bytes)

254. Re: [Amps] REL (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 13 Apr 2005 14:22:03 -0400
It is called a monopoly and manipulating the market by eliminating competition. 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte
/archives//html/Amps/2005-04/msg00264.html (8,765 bytes)

255. Re: [Amps] article in Nature, modified Aurora via HF (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 18 Apr 2005 11:19:37 -0400
I think the real issue is being missed there. The real test of non-linearity is the production of harmonic and intermodulation distortion. This means allows measurements of nonlinearity as small as a
/archives//html/Amps/2005-04/msg00362.html (10,886 bytes)

256. Re: [Amps] article in Nature, modified Aurora via HF (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 18 Apr 2005 15:13:42 -0400
Lots and lots of QRM 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-04/msg00376.html (9,804 bytes)

257. Re: [Amps] Bleeder Resistor Inquiry (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 27 Apr 2005 14:26:01 -0400
Believe or not Resistors have a voltage limit and rating. The standard 2 watt carbon film resistor is only rated for 300 or 400 volts DC. They can be pushed higher but not by a lot. The same is true
/archives//html/Amps/2005-04/msg00580.html (12,202 bytes)

258. Re: [Amps] Bleeder Resistor Inquiry (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 28 Apr 2005 11:16:49 -0400
High voltage,high resistance film resistors are still made the same way, with a spiral element to maximize the element's lenght. _______________________________________________ Amps mailing list Amps
/archives//html/Amps/2005-04/msg00599.html (15,730 bytes)

259. Re: [Amps] Glass Chimneys (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 02 May 2005 15:48:58 -0400
You don't need glass for external anode tubes because you are dealing with lower temperatures and infrared radiated by the anode does not have to escape thru the glass. Any material that has low diel
/archives//html/Amps/2005-05/msg00010.html (7,174 bytes)

260. Re: [Amps] prices of equip (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 04 May 2005 10:52:06 -0400
Look at bottom of bid record. High bid was retracted. It will go for $80.01 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/l
/archives//html/Amps/2005-05/msg00054.html (7,144 bytes)

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