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281. Re: [Amps] Choke input filters, design criteria? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 20 Dec 2012 05:19:37 -0600
yes the Henrys used resonant choke filters. This helps explain it: http://www.qsl.net/i0jx/supply.html There was a nice article in QST in June 1946 about how to get the inductance of a "mystery" chok
/archives//html/Amps/2012-12/msg00127.html (11,968 bytes)

282. Re: [Amps] Choke input filters, design criteria? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 22 Dec 2012 14:38:29 -0600
That's a lot of inductance for a power supply filter choke. The current rating for such a choke may be very low. How much does it weigh? a 30H 500 ma reactor should weigh in the neighborhood of 30 to
/archives//html/Amps/2012-12/msg00140.html (9,682 bytes)

283. Re: [Amps] 3-500Z tubes ... (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 23 Dec 2012 06:57:28 -0600
I have run a pair of the RFP 3-500ZG in a TenTec Centurion rf amplifier for about 11 years now with no issues. The Ep is 3100 v. no load. For the past few years I have used them exclusively in AM ser
/archives//html/Amps/2012-12/msg00152.html (8,436 bytes)

284. Re: [Amps] 500 uh plate choke (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 21 Jan 2013 06:46:16 -0600
That's a pi wound choke (I'd like to know why it is called that). I usually see them in older ham AM rigs where the B+ is 1.5 KV or less and the Ip is no more than a few hundred ma. I am not saying i
/archives//html/Amps/2013-01/msg00120.html (8,983 bytes)

285. Re: [Amps] 500 uh plate choke (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 22 Jan 2013 17:21:38 -0600
It's a plate choke; the shunt caps are on one end; it's not an output network. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin
/archives//html/Amps/2013-01/msg00133.html (11,031 bytes)

286. Re: [Amps] 500 uh plate choke (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 22 Jan 2013 17:30:04 -0600
you can test your chokes yourself. Get a modern solid state ham rig and fix it so it puts out around 20 watts cw. dump the RF into a 50 ohm resistor and put a T in the line. Connect the stem of the T
/archives//html/Amps/2013-01/msg00134.html (9,476 bytes)

287. Re: [Amps] 500 uh plate choke (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 24 Jan 2013 09:06:11 -0600
Thanks John, but I can't take credit for this--I got the idea from a page on W8JI's website and I should have credited him initially but I was in a hurry and didn't think to do that. 73 Rob K5UJ ____
/archives//html/Amps/2013-01/msg00142.html (8,724 bytes)

288. Re: [Amps] 500 uh plate choke (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 25 Jan 2013 09:29:26 -0600
I was quick to credit W8JI in a subsequent post--I certainly do not want to be seen as stealing ideas, but for some reason anything I post to this reflector seems to be delayed by 24 hours or longer.
/archives//html/Amps/2013-01/msg00152.html (9,080 bytes)

289. Re: [Amps] Rf choke coil form (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 1 Feb 2013 12:39:39 -0600
I'd look for a large Johnson open wire line ceramic spacer. they used to be made with porcelain for six inch line spacing. they show up at hamfests and other places and on line. McMaster Carr might h
/archives//html/Amps/2013-02/msg00007.html (8,482 bytes)

290. Re: [Amps] Peter Dahl Xformers: Another MFR? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 11 Feb 2013 14:03:49 -0600
hams who think Dahl was the only one in the whole world making transformers are freaking out. There are many fine makers of transformers. Yes they are expensive but have you looked at what new ham RF
/archives//html/Amps/2013-02/msg00084.html (7,378 bytes)

291. Re: [Amps] Peter Dahl Transformers (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 13 Feb 2013 13:34:49 -0600
I'd say if you have to put a fan on the plate iron you need bigger plate iron. If the bigger plate iron won't fit in the nice pretty amp, it needs to be un-prettied. rob K5UJ ________________________
/archives//html/Amps/2013-02/msg00105.html (8,767 bytes)

292. Re: [Amps] Peter Dahl Xformers: Another MFR? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 14 Feb 2013 05:29:03 -0600
Go for it Gary; there are plenty of pieces of equipment out there still using transformers and some percentage will need servicing. Rob K5UJ _______________________________________________ Amps maili
/archives//html/Amps/2013-02/msg00110.html (7,730 bytes)

293. Re: [Amps] Peter Dahl Transformers (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 14 Feb 2013 10:59:08 -0600
I take it the intelligent design is the one where you are not dissipating heat and running a fan and wasting power. Don't forget to employ an under rated transmission line matching network that also
/archives//html/Amps/2013-02/msg00111.html (9,594 bytes)

294. Re: [Amps] Peter Dahl Transformers (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 19 Feb 2013 19:52:14 -0600
You're warping this into an argument for cooling for an entire amp cabinet. That makes it seem like I was against that. The original context was about a fan on the plate iron only. My point was that
/archives//html/Amps/2013-02/msg00157.html (10,097 bytes)

295. Re: [Amps] Ten Tec Titan 425 Fuses Blew (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 22 Feb 2013 12:47:48 -0600
So, the amp is great. But what do you think of the power supply? Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/Amps/2013-02/msg00196.html (8,908 bytes)

296. Re: [Amps] Peter Dahl Transformers (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 22 Feb 2013 21:26:55 -0600
Suddenly you're talking about solid state ham rigs; nice try--do you have fans on everything? That question makes just about as much sense. Are you working on a design for a 1000 amp production run o
/archives//html/Amps/2013-02/msg00201.html (11,042 bytes)

297. Re: [Amps] 813 efficiency (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 28 Feb 2013 09:21:54 -0600
Maybe in the monied qrm-tester dx-chaser plug and play ham radio world but not everywhere. Not everyone is raptured by here-today gone-tomorrow FETs and future unobtainium microchip control circuitry
/archives//html/Amps/2013-03/msg00000.html (7,777 bytes)

298. Re: [Amps] Expert 2K (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 5 Mar 2013 11:51:45 -0600
What's an "output port?" Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2013-03/msg00068.html (7,402 bytes)

299. Re: [Amps] rms Volts, Amps and Watts (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 9 Mar 2013 17:12:19 -0600
Sounds like another idea based on lack of understanding similar to the common thinking that a vswr null on some frequency indicates a resonant frequency for the load. rob k5uj _______________________
/archives//html/Amps/2013-03/msg00120.html (7,156 bytes)

300. Re: [Amps] BAD DEAL STAY AWAY! / an alternative source (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 20 Mar 2013 05:16:22 -0500
Look at all you guys lining up to heap abuse on some Russian guy. I certainly give my sympathy to the ham who lost money on the deal but if you think the Russian has never been burned by idiots who d
/archives//html/Amps/2013-03/msg00271.html (8,804 bytes)

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