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References: [ +from:df3kv@t-online.de: 314 ]

Total 314 documents matching your query.

241. Re: [Amps] 5CX1500A (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 6 May 2010 22:45:23 +0200
The Penta data sheets shows IM3 figures in AB1 as follows: 2.5KV, 1090 out, -38db 3KV, 1330 out, -36db 4KV, 1785 out, -33db If someone needs a copy I will send the pdf 73 Peter A text-searchable DVD
/archives//html/Amps/2010-05/msg00080.html (10,298 bytes)

242. Re: [Amps] High Power Parts (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Fri, 21 May 2010 04:39:37 +0200
Big amplifier project? Is that not a two times 4-400 amp? 73 Peter Listmates, I have a couple of RCA BTA-1R1 BC transmitters that are left over from a restoration job. There are lots of parts remaini
/archives//html/Amps/2010-05/msg00232.html (8,015 bytes)

243. Re: [Amps] Heath copyright (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Fri, 21 May 2010 18:20:19 +0200
Do they also do illegal copies of the TS-140? That cost even more then 40$... 73 Peter but selling a TS-140 manual for 40$ IS forcing many of us to resort to illegal copies! _________________________
/archives//html/Amps/2010-05/msg00243.html (8,370 bytes)

244. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Mon, 24 May 2010 02:20:57 +0200
He was talking about a class-c amplifier and I fully agree with Joe, there will be no smooth transition at all 73 Peter There is no turn on/turn off. That's what I'm trying to tell you. The smooth ph
/archives//html/Amps/2010-05/msg00361.html (10,656 bytes)

245. Re: [Amps] 1 db compression point procedure ? (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Wed, 30 Jun 2010 14:59:12 +0200
Hi Jim, I think the easiest way is to tune and load for maximum output, then reduce drive to find the power output at the compression point by reducing the drive level and retuning to maximum output
/archives//html/Amps/2010-06/msg00222.html (9,409 bytes)

246. Re: [Amps] New High Efficiency 3-500Z plate caps (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 1 Jul 2010 21:57:00 +0200
The other heat dissipating connector in the video is not by Eimac. Eimac recommends the type HR-6 together with their SK-406 chimney. 73 Peter Check out http://www.youtube.com/watch?v=EoVCGFPvOuk <ht
/archives//html/Amps/2010-07/msg00013.html (8,910 bytes)

247. Re: [Amps] Do they actually rebuild 8877s? (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Tue, 6 Jul 2010 02:36:52 +0200
I wonder what kind of RF engineer writes something on the ceramic of tubes 73 Peter --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On Behalf Of Roger Sent
/archives//html/Amps/2010-07/msg00055.html (9,068 bytes)

248. Re: [Amps] parasitic suppressor voodoo (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 15 Jul 2010 15:27:45 +0200
Parasitic suppressors should be designed for the circuit which needs it. The parasitics frequencies vary with tube selection and amp layout. Most of the time I donīt even need one. 73 Peter Can someo
/archives//html/Amps/2010-07/msg00123.html (7,508 bytes)

249. Re: [Amps] parasitic suppressor voodoo (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Fri, 16 Jul 2010 13:35:00 +0200
That what I do if I really need to do it. A small loop through a ferrit toroid, or 2-3 turns with ferrit inside. I never used resistors except at the time of sweep tubes. 73 Peter On a 2 x 4-1000A I
/archives//html/Amps/2010-07/msg00155.html (11,619 bytes)

250. Re: [Amps] Size of Parasitic Chokes (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Fri, 16 Jul 2010 19:54:46 +0200
I use mine without suppressors from the beginning. It is a very stable tube. If you donīt need one donīt include one. 73 Peter I see 3CX3000A7 amps with no suppressor at all. How stable have any of y
/archives//html/Amps/2010-07/msg00176.html (8,254 bytes)

251. Re: [Amps] More parasitic choke questions (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Wed, 28 Jul 2010 15:11:22 +0200
Why is that impossible? On HF the resistor is almost shorted out by the inductor. The power absorbed will be less then 0.5% of the desired HF with a typical amp. 73 Peter REPLY: Not absorb "any" of t
/archives//html/Amps/2010-07/msg00285.html (9,608 bytes)

252. Re: [Amps] More parasitic choke questions (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Wed, 28 Jul 2010 17:08:01 +0200
Sure, they might do dissipate some power, but in respect to the desired! HF (1500W) it is negligible. I calculated 1A through 5 ohms at most. 73 Peter it would seem that at the HF end of the HF spect
/archives//html/Amps/2010-07/msg00290.html (10,088 bytes)

253. Re: [Amps] More parasitic choke questions (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Wed, 28 Jul 2010 22:52:08 +0200
I normally do not need a resistor at all. Either, because a parasitic suppressor is not found necessary, or my usual way of blocking parasitics by loading a one turn loop with a ferrite toroid. On so
/archives//html/Amps/2010-07/msg00300.html (10,890 bytes)

254. Re: [Amps] New HF amplifier (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Tue, 3 Aug 2010 20:48:24 +0200
No, he is not saying that. 73 Peter So you're saying Alpha, Ten-Tec, Jim W8ZR, Jerry K8RA and myself are all wrong and their designs don't or wont work? ______________________________________________
/archives//html/Amps/2010-08/msg00023.html (8,295 bytes)

255. Re: [Amps] triode or tetrode (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 26 Aug 2010 17:38:04 +0200
Hi Jim, I had the same problem, my usual amp is missing 160m as well. I decided to use a single 3CX3000A7 in GG for my 160m amp. The tube is instant on and the cooling requirement is low. With a rela
/archives//html/Amps/2010-08/msg00389.html (8,523 bytes)

256. Re: [Amps] Pulse tuning (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 23 Sep 2010 22:07:59 +0200
Agreed. If one needs pulse tuning not to blow up his amp, he undersized components. 73 Peter ORIGINAL MESSAGE: REPLY: And what is the duty cycle for SSB? 50%? 60%? 85%? The problem is you can't know
/archives//html/Amps/2010-09/msg00287.html (9,248 bytes)

257. Re: [Amps] Pulse tuning (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 23 Sep 2010 22:18:01 +0200
No. Plate current will not be way higher and dissipation will not either. I tune for maximum out in the center of the band and donīt touch anything while moving around in a contest. Output power drop
/archives//html/Amps/2010-09/msg00288.html (8,162 bytes)

258. Re: [Amps] 6146 via 572b's (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Wed, 13 Oct 2010 02:22:36 +0200
The 4CX350A is happy with 2 Watts through a 1:4 unun, if a 200 ohm grid dummy load is used it does 350W. When the grid is loaded with 50 Ohm 7W are sufficient for 350W out. 73 Peter Passive grid 4CX2
/archives//html/Amps/2010-10/msg00210.html (10,499 bytes)

259. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Tue, 9 Nov 2010 16:04:17 +0100
Power matters less then common believe, antennas and location decide who is loud. 73 Peter, DJ7WW What about the guys who are only allowed 400 Watts. Should we back ours down to make everything equal
/archives//html/Amps/2010-11/msg00087.html (10,348 bytes)

260. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Tue, 9 Nov 2010 17:46:15 +0100
You will know nothing! I bet, I will be at least 10db stronger with 750W on 20m in California then any other station from Europe using a ground plane antenna and 20KW http://i.pbase.com/o6/91/283791/
/archives//html/Amps/2010-11/msg00094.html (7,813 bytes)

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