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

Total 314 documents matching your query.

261. [Amps] FW: door knob capacitors (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Sun, 27 Feb 2011 20:36:17 +0100
Why do you want at least a 10KV rating while the capacitors will not see more then 500V? More important is to select a RF doorknob with low TCC. 73 Peter I need either a 1000 pf or two 500 pf door kn
/archives//html/Amps/2011-02/msg00198.html (7,871 bytes)

262. Re: [Amps] Alpha vs Henry (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Wed, 6 Apr 2011 12:22:28 +0200
I will look quite old against a Ferrari 599GTO, Porsche 911 or Audi R8 to run 3-4 cars very easily. When I get done with the engine, it will be on steroids. Frivolous, who cares. It blows the doors o
/archives//html/Amps/2011-04/msg00213.html (8,453 bytes)

263. Re: [Amps] DIN vs N (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Sun, 24 Apr 2011 05:05:59 +0200
The largest cable I use with them is 1 5/8". They are available for almost any cable. I donīt know of any disadvantage of those connectors, I use them for more then 40 years. One of the advantages is
/archives//html/Amps/2011-04/msg00496.html (7,865 bytes)

264. Re: [Amps] DIN vs N (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Mon, 25 Apr 2011 16:57:44 +0200
Those 10-15W are per channel, not per connector. Cell phone sites run multiple transmitters into the same antenna. That is also the reason why IMD by connectors and cables needs to be as low as possi
/archives//html/Amps/2011-04/msg00521.html (7,799 bytes)

265. Re: [Amps] DIN vs N (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Tue, 26 Apr 2011 02:58:26 +0200
Yes, as said before, I use 5/8" Cellflex (LCF58-50)by RFS on 144MHz around the rotator. The Andrew type will be LD4.5-50. 73 Peter I think the plain ole PL259 due to more contact area will handle mor
/archives//html/Amps/2011-04/msg00530.html (9,822 bytes)

266. Re: [Amps] testing a big amp (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Sat, 14 May 2011 07:11:27 +0200
I read 2MW out Not very efficient @ 180KW load. Two point eight megawatts in / 180 KW out _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
/archives//html/Amps/2011-05/msg00093.html (6,883 bytes)

267. Re: [Amps] PA efficiency (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 19 May 2011 12:35:34 +0200
You might have a hard time to reach even 60% efficiency from a VHF/UHF amp 73 Peter If I built an amp that I thought had 68% eff.... then found out it was really only 48%... I'd go nuts. Not good eno
/archives//html/Amps/2011-05/msg00157.html (8,212 bytes)

268. Re: [Amps] PA efficiency (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Thu, 19 May 2011 16:49:43 +0200
It depends on the circuit layout, the type of tube and the anode voltage. The Eimac datasheet of the 4CX250B shows 48% at 1KV, 57% at 1.5KV and 60% at 2KV. Circuit losses still must be deducted from
/archives//html/Amps/2011-05/msg00164.html (10,652 bytes)

269. Re: [Amps] Should a blower run after amp shutdown? (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Fri, 3 Jun 2011 15:14:42 +0200
I never saw that happen with a constant voltage transformer (transducer). Are you sure yours is based on transformer/choke and not an inverter? However, how do you measure AC with a moving coil meter
/archives//html/Amps/2011-06/msg00021.html (9,320 bytes)

270. Re: [Amps] 4-1000 (score: 1)
Author: "DF3KV" <df3kv@t-online.de>
Date: Sun, 17 Jul 2011 14:37:06 +0200
I had three AM-6154. In the early 80s those were sold in quantity over here. One was with DX393, the other with 8930s. The Russian GS-36B runs pretty well with them too. 73 Peter, DJ7WW Dave, the 893
/archives//html/Amps/2011-07/msg00199.html (14,859 bytes)

271. Re: [Amps] RF in the Audio (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 25 Sep 2011 00:47:41 +0200
What for? Nobody would buy or need one. How could common mode current appear on a near or perfectly balanced parallel wire feedline? I may have missed something but I was unable to find any sort of c
/archives//html/Amps/2011-09/msg00173.html (8,484 bytes)

272. Re: [Amps] RF in the Audio (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 25 Sep 2011 02:20:20 +0200
Hi Jim, That is not something new to me ;-)) But the question concerned that perfectly! balanced open feeder which certainly carries no common mode current. 73 Peter Common mode current results from
/archives//html/Amps/2011-09/msg00176.html (10,069 bytes)

273. Re: [Amps] Is after-powerdown cooling desirable? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 20 Dec 2011 19:33:33 +0100
The Eimac data sheets of those tubes donīt say so. All the Henry amps with that tube donīt do so and the Racal TA1800 with its 4CX10000D doesnīt do it either. The data sheet of the 4CX15000A says air
/archives//html/Amps/2011-12/msg00166.html (8,574 bytes)

274. Re: [Amps] Emtron DX-3 PRICE REDUCED FOR CHRISTMAS (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 25 Dec 2011 16:31:12 +0100
That tube has nothing in common with the 4CX3000A except being a tetrode 73 Peter, DJ7WW My DX-3 was purchased brand new by me direct from Emtron in April 2008 and it is still under their four year w
/archives//html/Amps/2011-12/msg00208.html (7,480 bytes)

275. Re: [Amps] Henry HF 2500 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 5 Jan 2012 16:59:54 +0100
I own one too, converted to 10m, it is originally a 27MHz plasma generator with 3CX3000A7,4-400 driver, 6146 pre driver and single phase supply, with 3-phase P/S it is HF3000 and uses a transistor dr
/archives//html/Amps/2012-01/msg00055.html (8,514 bytes)

276. Re: [Amps] 8877 tubes (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 12 Jan 2012 23:01:47 +0100
There is a company near my location who replaced Amperex 4-400B by 8877 when Amperex stopped production. The tubes are used as voltage regulators in plasma sputting devices. For more then 3 years I w
/archives//html/Amps/2012-01/msg00135.html (7,900 bytes)

277. Re: [Amps] 8877 tubes (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 13 Jan 2012 19:48:37 +0100
Unfortunately not, but I will try to find out 73 Peter Hi Peter: This company using 8877 tubes near your location, do you know the name of the Chinese company they are using for their 8877 tubes? 73,
/archives//html/Amps/2012-01/msg00144.html (9,319 bytes)

278. Re: [Amps] Different amp recommendations (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 9 Feb 2012 18:17:41 +0100
Sure, but nobody will be so stupid to let it idle without doing a transmission, so what? 73 Peter, DJ7WW thing sucks 675 ma on idle = blast furnace. 225 ma per tube. [450 ma for the 2 x holer]. _____
/archives//html/Amps/2012-02/msg00078.html (8,294 bytes)

279. Re: [Amps] 6kW Coax (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 9 Mar 2012 21:55:59 +0100
Hi Dave, You could do the solution with series matching. Just parallel the two 6KW sides and direct feed 3,625 feet of 50 ohm Cellflex 1 5/8", follow that cable with 0,9 feet of three cables Cellflex
/archives//html/Amps/2012-03/msg00093.html (7,774 bytes)

280. Re: [Amps] 6kW coax? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 10 Mar 2012 01:03:57 +0100
1 5/8" EIA? Peter, DJ7WW --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On Behalf Of Carl Sent: Freitag, 9. März 2012 23:49 To: Ed Heimbach; David Shapiro
/archives//html/Amps/2012-03/msg00100.html (9,370 bytes)

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