- 221. Re: [Amps] Why price difference (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Thu, 03 Feb 2005 12:06:19 -0500
- Supply and Demand primarily and secondarily product loyalty and mythology. If Collins, today, made the same amplifier I bet it would sell for much more. It is a mistake to think that price is connect
- /archives//html/Amps/2005-02/msg00033.html (9,566 bytes)
- 222. Re: [Amps] Why price difference/30S1 (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Thu, 03 Feb 2005 14:08:05 -0500
- When the 30S1 was manufactured amateur operations were limited on 160 meters not only in power but in some areas not at all. That is why all of the old linear amplifiers were made for 80-10 meters. 7
- /archives//html/Amps/2005-02/msg00048.html (9,329 bytes)
- 223. Re: Re: [Amps] 10 DB increase (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Sat, 05 Feb 2005 23:41:33 -0500
- They are only the same only if input and load resistances are the same. When these resistances are not equal the 20log Vo/Vi is usually used. An example would be the gain of an audio interstage ampli
- /archives//html/Amps/2005-02/msg00173.html (11,010 bytes)
- 224. Re: [Amps] 10dB and propagation (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 07 Feb 2005 14:18:50 -0500
- In the late sixties and early seventies an EE professor of mine was doing research into plasma physics studying the effects of ionization on radio propagation. The study had to do with studying the n
- /archives//html/Amps/2005-02/msg00240.html (11,434 bytes)
- 225. Re: [Amps] Quick 220 outlet? (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 07 Feb 2005 14:27:21 -0500
- So you search around and try different AC outlets to plug in the two plugs until the amber light comes on which indicates that the two outlets are 180 degrees out of phase. I think I can do this for
- /archives//html/Amps/2005-02/msg00241.html (8,071 bytes)
- 226. Re: [Amps] 10dB and propagation (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 07 Feb 2005 15:38:15 -0500
- Well, I don't drink, and I only submitted one bit of information. Never, expected or saw any amplification. Just lots of frequency mixing and intermodulation and signal scrambling. The HAARP could ju
- /archives//html/Amps/2005-02/msg00253.html (9,705 bytes)
- 227. Re: [Amps] 10dB and propagation (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Tue, 08 Feb 2005 11:30:05 -0500
- I don't think there was any mention of gravity waves. Bending of light by gravity is a result of the fact that light has finite speed and that acceleration due to gravity is no different from acceler
- /archives//html/Amps/2005-02/msg00305.html (10,285 bytes)
- 228. Re: [Amps] Degreasing Ceramic (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Mon, 14 Feb 2005 20:42:24 -0500
- IBM did not have an exclusive on trichloroethane. Just about all companies using rosin flux on their solder line used trichloroethane to clean off the flux. Now days an acid flux is used because it c
- /archives//html/Amps/2005-02/msg00508.html (10,009 bytes)
- 229. Re: Re: [Amps] Could we *all* use the right tube part numbers? (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Mon, 14 Feb 2005 22:37:46 -0500
- While you are at it. 20 meters is not 14 mhz. that should be MHz and or 14000 kHz, "K" is Kelvin there are DB-25 connectors and DE-9 connectors NOT DB-9 DA-15 DB-25 DC-37 DD-50 and the 9 pin was a af
- /archives//html/Amps/2005-02/msg00516.html (8,663 bytes)
- 230. Re: [Amps] 813 top cap cement (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Thu, 17 Feb 2005 18:02:51 -0500
- RTV (silicone Cement) works very well. It bonds to glass and metal well and is very resistant to temperature. Try it sometime. Take a cured glob of Silicone Cement and put your soldering iron against
- /archives//html/Amps/2005-02/msg00566.html (7,880 bytes)
- 231. Re: [Amps] 813 top cap cement (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Thu, 17 Feb 2005 20:53:22 -0500
- A thin layer of silicone will not flex much but will have enough give to keep stress off of the glass. If it is only a few thousandths thick how much can it compress? Epoxy and other very hard materi
- /archives//html/Amps/2005-02/msg00568.html (9,829 bytes)
- 232. Re: [Amps] Fwd: Pi-L In-circuit Adjustment Question (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 21 Feb 2005 10:11:05 -0500
- The L networks are resonant. All three of them in a Pi-L network. Two step down and one steps impedance) Looking at a single L network ( impedance step down) with a resistive load you will see that i
- /archives//html/Amps/2005-02/msg00647.html (9,754 bytes)
- 233. Re: [Amps] Fwd: Pi-L In-circuit Adjustment Question (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Tue, 22 Feb 2005 16:40:53 -0500
- One minor glitch in the process is that plate current may drop due to the impedance at the tube's input changing. This is noticed at times with either grounded grid or neutralized grid driven amplifi
- /archives//html/Amps/2005-02/msg00672.html (12,716 bytes)
- 234. Re: [Amps] Fwd: Pi-L In-circuit Adjustment Question (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Wed, 23 Feb 2005 11:11:37 -0500
- I am not referring to input resistance but to the "Miller effect" or coupling from the plate to input circuit that in effect changes it's input reactance. 73 Bill wa4lav _____________________________
- /archives//html/Amps/2005-02/msg00687.html (16,044 bytes)
- 235. Re: [Amps] Fwd: Pi-L In-circuit Adjustment Question (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Wed, 23 Feb 2005 11:54:54 -0500
- Ok that is fine. For reasonable values of Q the "1" is on the order of variables you have no control over such as tolerances, parasitic reactances, variations in tubes etc. That is why I simplify thi
- /archives//html/Amps/2005-02/msg00689.html (10,838 bytes)
- 236. Re: [Amps] Fwd: Pi-L In-circuit Adjustment Question (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Wed, 23 Feb 2005 14:01:57 -0500
- Yes, Miller effect is due to the current fed back from the output to the input of the amplifier. Neutralization nulls out this current this current. Imagine you have a tube amplifier (common cathode)
- /archives//html/Amps/2005-02/msg00697.html (20,595 bytes)
- 237. Re: [Amps] Is ALC necessary (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Sun, 27 Feb 2005 23:41:31 -0500
- ALC helps prevent over driving which causes splatter. It you don't drive your amplifier close to maximum output and you are sure that you will be clipping on voice peaks or your amplifier has lots of
- /archives//html/Amps/2005-02/msg00921.html (8,001 bytes)
- 238. Re: [Amps] close to off topic - how to read antenna R + jX ?? (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Sun, 27 Feb 2005 23:49:22 -0500
- The HP vector voltmeters are nice but often the probes have been blown away due to application of either DC or excessive signal. Also, adapters are very hard to find for them. The probes themselves h
- /archives//html/Amps/2005-02/msg00922.html (11,314 bytes)
- 239. Re: [Amps] Fingerprints on 3Z500 tubes (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Tue, 01 Mar 2005 09:09:07 -0500
- To answer your question. NO, DON'T Worry about it. This myth really got rolling with the introduction of high pressure Quartz Halogen lamps. These lamps have very very hot filaments with high pressur
- /archives//html/Amps/2005-03/msg00000.html (8,861 bytes)
- 240. Re: [Amps] Class E amd and MRF492 (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Wed, 09 Mar 2005 09:05:12 -0500
- Here is the problem. It seems to me that using either system effectively reduces efficiency of the amplifier. The Cartesian loop system modifies the input signal to linearize the amplifier this chang
- /archives//html/Amps/2005-03/msg00229.html (9,593 bytes)
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