- 241. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Sun, 15 Oct 2006 20:13:22 -0500
- The ARRL ssb handbook used to say something like that. They did say with 2 tone test but also alluded to the 2 times average for voice also. I Not sure what you are saying here? Are we getting over
- /archives//html/Amps/2006-10/msg00149.html (9,927 bytes)
- 242. Re: [Amps] 1000 Watt Limit to 1500 OUT (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Sun, 15 Oct 2006 20:33:04 -0500
- Not so hoakie but very practical. The ssb position on those amps like the SB220, Drake etc. raised the plate voltage and plate current to maintain the same plate load impedance that you had when you
- /archives//html/Amps/2006-10/msg00151.html (12,313 bytes)
- 243. Re: [Amps] PEP power.. (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 16 Oct 2006 11:52:10 -0500
- To add a little more clarification to Ian's nice explanation; The AVERAGE power that Ian is describing is what many (incorrectly) refer to as RMS power of the RF. Peak envelope power has nothing to
- /archives//html/Amps/2006-10/msg00179.html (11,515 bytes)
- 244. Re: [Amps] PEP power.. (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 16 Oct 2006 11:55:13 -0500
- The 2:1 ratio of peak envelope power to average power is the relationship that there is when modulating the transmitter with 2 equal amplitude tones. That is the only time that relationship is prese
- /archives//html/Amps/2006-10/msg00180.html (8,648 bytes)
- 245. Re: [Amps] PEP power.. (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 16 Oct 2006 14:09:55 -0500
- I think using incorrect terms creates more problems. Long ago when I first read the FCC's definition of peak envelope power I saw the word "AVERAGE" in there, not RMS as most would expect when descr
- /archives//html/Amps/2006-10/msg00183.html (13,885 bytes)
- 246. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Thu, 2 Nov 2006 09:44:48 -0600
- A regulated bias supply with AB1 operation?? That sounds like a recipe for disaster. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
- /archives//html/Amps/2006-11/msg00036.html (9,854 bytes)
- 247. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Thu, 2 Nov 2006 10:31:06 -0600
- If there is severe overshoot coming out of the exciter any amplifier is going to have problems with it causing distortion products. With an AB1 amplifier with a stiff bias supply how do you keep fro
- /archives//html/Amps/2006-11/msg00038.html (9,632 bytes)
- 248. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Thu, 2 Nov 2006 17:58:29 -0600
- No I did mean the 32S1, KWM2 etc. but the 30S1 falls into the same category as alc and grid protection are derived in a similar manner in all. A moderate grid impedance protects the tubes from exces
- /archives//html/Amps/2006-11/msg00043.html (11,451 bytes)
- 249. Re: [Amps] class "A" RF amp question (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 8 Nov 2006 16:57:35 -0600
- If you increased the carrier out to say 400 watts then the amplifier would have to be tuned to 1600 watts PEP in order to handle 100% modulation. 73 Gary K4FMX ______________________________________
- /archives//html/Amps/2006-11/msg00130.html (9,560 bytes)
- 250. Re: [Amps] class "A" RF amp question (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 8 Nov 2006 17:03:03 -0600
- Actually low level AM generated with something like an FT101 and amplified with a linear amp can produce much better quality AM than most plate modulated AM transmitters. It is much easier to get low
- /archives//html/Amps/2006-11/msg00131.html (8,888 bytes)
- 251. Re: [Amps] AM On a linear (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 8 Nov 2006 20:50:00 -0600
- But if the amp is driven into class C as it would need to be in order to plate modulate it wouldn't the same thing exist most of the time that the tube was in cutoff? 73 Gary K4FMX __________________
- /archives//html/Amps/2006-11/msg00135.html (8,559 bytes)
- 252. Re: [Amps] "Booster help" (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Fri, 10 Nov 2006 17:16:13 -0600
- The 6146 should work but you need a tuned grid circuit and neutralization and a regulated screen supply. You could get away with out regulating the screen if it is loaded with resistors enough. Look
- /archives//html/Amps/2006-11/msg00145.html (9,545 bytes)
- 253. Re: [Amps] Class A for AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Tue, 14 Nov 2006 19:34:00 -0600
- Except in class A the input power never changes. If it is set up for 6000 watts input in order to provide 1500 watts output @25% efficiency then the input power will always be a constant 6000 watts w
- /archives//html/Amps/2006-11/msg00179.html (12,212 bytes)
- 254. Re: [Amps] Class A for AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Tue, 14 Nov 2006 21:05:55 -0600
- Hi Tom, I was just reading some info on class A amplifiers. It seems that a typical triode class A1 amplifier (no grid current) the efficiency is in the range of 20% to 35%. A class A2 (some grid cu
- /archives//html/Amps/2006-11/msg00183.html (11,521 bytes)
- 255. Re: [Amps] Class A for AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Tue, 14 Nov 2006 22:26:36 -0600
- No. Push pull has nothing to do with amplitude linearity in RF service. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com
- /archives//html/Amps/2006-11/msg00185.html (12,109 bytes)
- 256. Re: [Amps] Class A for AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Tue, 14 Nov 2006 22:33:00 -0600
- Hi Jim, True enough! The more power you take out the higher the efficiency and the less plate dissipation. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contes
- /archives//html/Amps/2006-11/msg00186.html (9,799 bytes)
- 257. Re: [Amps] Class A for AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 15 Nov 2006 09:31:42 -0600
- Push pull is necessary in a class B audio amplifier because the second tube makes up for the missing half cycle of the first tube. With only one tube in a class B audio amplifier the output would be
- /archives//html/Amps/2006-11/msg00199.html (12,858 bytes)
- 258. Re: [Amps] Class A for AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 15 Nov 2006 09:54:18 -0600
- The efficiency is on the order of 35% at carrier with screen grid modulation or control grid modulation and the peak envelope power efficiency is 70% to 75% very similar to the efficiency changes th
- /archives//html/Amps/2006-11/msg00201.html (8,867 bytes)
- 259. Re: [Amps] Class A fo AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 15 Nov 2006 10:05:44 -0600
- Clamp tube modulation is a form of controlled carrier modulation which is a hybrid screen modulation. With controlled carrier modulation power input does change some unlike straight screen modulation
- /archives//html/Amps/2006-11/msg00202.html (8,852 bytes)
- 260. Re: [Amps] Class A for AM (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 15 Nov 2006 10:17:29 -0600
- Yes tom, as far as heat dissipation goes I would think that would be in the ball park. But actual efficiencies that the amplifier needs to operate at would be figured at the peak envelope power leve
- /archives//html/Amps/2006-11/msg00203.html (12,047 bytes)
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