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241. Re: [Amps] Titan 425 Reflected Power (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 24 Sep 2006 23:53:31 -0700
Nevermind my previous suggestion, Jim. It doesn't apply here. I misread your original post and was somehow thinking that the Titan meter matched the reading on the Bird and the antenna tuner bridges
/archives//html/Amps/2006-09/msg00302.html (9,759 bytes)

242. Re: [Amps] Titan 425 Reflected Power (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 25 Sep 2006 07:22:53 -0700
Hi Jim, Are you sure that you have done due diligence twiddling the amplifier load and tune controls with a zero reflected power reading on the external Bird meter (higher VSWR reading on Titan meter
/archives//html/Amps/2006-09/msg00308.html (9,895 bytes)

243. Re: [Amps] Amplifier Rule Changes in the new R&O (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 14 Oct 2006 18:33:10 -0700
It appears most everyone is thinking about controlling/disabling the RF. Take the focus off 21 ~ 30 MHz RF solutions for a moment. What's to say the internal frequency detector couldn't manage the HV
/archives//html/Amps/2006-10/msg00126.html (8,887 bytes)

244. Re: [Amps] Alpha 87a (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 1 Jan 2007 20:15:02 -0800
Dick, Its been my experience that air wound inductors (in general) are very sensitive to turns spacing. I'd be surprised if they were less sensitive to turn spreading (on a percentage change in react
/archives//html/Amps/2007-01/msg00014.html (7,931 bytes)

245. Re: [Amps] An interesting eBay item (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 14 Jan 2007 12:52:57 -0800
Lets see 34,000 volts at 2 amps "continious" -> 68 KW input power? 15,000 KW output power? 53 KW anode dissipation? Huh? I mean if you are going to lie to people, you should at least make your lies s
/archives//html/Amps/2007-01/msg00149.html (8,605 bytes)

246. Re: [Amps] power supply transformer (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 30 Jan 2007 22:15:07 -0800
Sounds like a good application for a switch-mode supply. Mike W4EF.............................. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2007-01/msg00338.html (9,132 bytes)

247. Re: [Amps] drive power (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 24 Mar 2007 12:08:20 -0700
Keith, I think Tom was referring to the internal ALC loop in the transceiver rather than the external ALC loop that use the amplifier ALC output fed back into the transceivers external ALC input. The
/archives//html/Amps/2007-03/msg00328.html (10,455 bytes)

248. Re: [Amps] WANTED Turns Counter (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 7 Apr 2007 12:41:29 -0700
Arne and Group: I think Surplus Sales of Nebraska is having Groth style counters made for them by a private labeller: http://www.surplussales.com/ShaftHardware/ShaftH-1.html 73, Mike W4EF............
/archives//html/Amps/2007-04/msg00032.html (7,201 bytes)

249. Re: [Amps] Ion Pumps (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 25 Apr 2007 19:55:19 -0700
I agree, Tom. If you look at curves for RF ionization breakdown susceptibility, there is a peak at around 10 to 15 Torr. In other words gas ionization generally gets worse before it gets better. BTW,
/archives//html/Amps/2007-04/msg00308.html (8,362 bytes)

250. Re: [Amps] ALPHAs and momentary power outages (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 16 Jul 2007 18:27:17 -0700
FWIW, the switch mode regulators the Honda EU2000i generators will handle the capacitive input of a linear amplifier quite nicely (at least they have so far for me). I've run a Drake L-7 from a pair
/archives//html/Amps/2007-07/msg00287.html (10,872 bytes)

251. Re: [Amps] ALPHAs and momentary power outages (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 18 Jul 2007 20:41:01 -0700
I'll bet the simplest / cheapest solution would be a couple of RF relays and a used SB-220 with a tuning preset template placed over the load and tunes controls that you could throw in the line while
/archives//html/Amps/2007-07/msg00339.html (10,928 bytes)

252. Re: [Amps] Drake amplifier (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 23 Jul 2007 12:18:19 -0700
That's about what I get out of mine, Gary. The Ep on the L-7 is too low to get legal limit. Mike W4EF.............................. _______________________________________________ Amps mailing list A
/archives//html/Amps/2007-07/msg00375.html (7,870 bytes)

253. Re: [Amps] Load Pulling (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 13 Sep 2007 00:14:06 -0700
Tom, Something doesn't make sense here. 1/20ns = 50 MHz, not 50 KHz!! The period of a 2 MHz carrier is 500ns, so with a pulse width of 20ns, you are only transmitting a small fraction (4%) of a singl
/archives//html/Amps/2007-09/msg00134.html (9,630 bytes)

254. Re: [Amps] MFJ and Dahl (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 8 Dec 2007 18:15:50 -0800
Yeah, I suspect the big improvements in the Ameritron amps came when W8JI took over the business from Prime Instruments. Its too bad the Jue doesn't pay more attention to quality. There are lot of us
/archives//html/Amps/2007-12/msg00090.html (8,461 bytes)

255. Re: [Amps] MFJ and Dahl (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 9 Dec 2007 12:31:41 -0800
I agree, Jim. Dahl is a great example. Dahl had a good following not because he had the lowest prices, but because he had a reputation for building a top-notch product. People buy Dahl because the wa
/archives//html/Amps/2007-12/msg00110.html (11,631 bytes)

256. Re: [Amps] MFJ (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 9 Dec 2007 14:30:37 -0800
-- Original Message -- From: "Doug Renwick" <ve5ra@sasktel.net> To: "'Jim Brown'" <jim@audiosystemsgroup.com>; <amps@contesting.com> Sent: Sunday, December 09, 2007 1:28 PM Subject: Re: [Amps] MFJ OK
/archives//html/Amps/2007-12/msg00114.html (10,317 bytes)

257. [Amps] DEAD Alpha 91B (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Wed, 04 Mar 2009 19:46:49 -0800
I am about to pull my Alpha 91B out of the operating desk to do a post mortem. The amp has AC power and the 4 fuses on the rear apron appear good (buzzed them out with my Fluke meter), but nothing ha
/archives//html/Amps/2009-03/msg00129.html (6,806 bytes)

258. Re: [Amps] dead amp (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Wed, 04 Mar 2009 21:15:58 -0800
Yes, that was my first thought, Allan. I wiggled the plug a few times and then checked the mains voltage with my Fluke meter. No such luck. The problem appears to be inside the amp. If I wasn't sick
/archives//html/Amps/2009-03/msg00132.html (7,004 bytes)

259. Re: [Amps] DEAD Alpha 91B (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 05 Mar 2009 04:30:06 -0800
No, Bob, it's not plugged in. It's never been plugged-in, but magically it used to light-up when I pushed the on/off switch and after 5 minutes it would make 1500 watts. Now it's dead. I will try plu
/archives//html/Amps/2009-03/msg00138.html (7,919 bytes)

260. Re: [Amps] DEAD Alpha 91B (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 05 Mar 2009 09:06:14 -0800
No, just you, Bob. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-03/msg00142.html (9,784 bytes)

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