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361. Re: [Amps] SPE 2K RTTY Duty Cycle (score: 1)
Author: "Roger (K8RI)" <>
Date: Fri, 22 May 2015 08:27:03 -0400
How many switches, feedlines, and antennas, external to the a mp can survive 1500 w carrier for long? I'm sorry, but I have to disagree It depends on the switches. Most RG-8 size feed lines will hand
/archives//html/Amps/2015-05/msg00141.html (14,141 bytes)

362. Re: [Amps] SPE 2K RTTY Duty Cycle (score: 1)
Author: "Roger (K8RI)" <>
Date: Fri, 22 May 2015 08:29:45 -0400
And they get the IM3 down 40db or greater 73 Roger (K8RI) Not sure if they do, but it would be interesting to try and obtain a no-time limit (NTL) spec from SPE. I have the 1K-FA model and I suspect
/archives//html/Amps/2015-05/msg00142.html (12,540 bytes)

363. Re: [Amps] SPE 2K RTTY Duty Cycle (score: 1)
Author: "Roger (K8RI)" <>
Date: Fri, 22 May 2015 12:34:20 -0400
As Paul said, it can be done. Manufacturers tout receiver figures that are nonsensical. They are real, they can be duplicated and proven, but the gain us little to nothing as long as the bands are lo
/archives//html/Amps/2015-05/msg00152.html (15,048 bytes)

364. Re: [Amps] 12V IM3 (score: 1)
Author: "Roger (K8RI)" <>
Date: Fri, 22 May 2015 20:25:54 -0400
I know, which is one of the reasons I used it. The CPI (inflation) is a fictitious number just like unemployment. Electronics except for specialty items has benefited from scale. That Collins station
/archives//html/Amps/2015-05/msg00167.html (12,820 bytes)

365. Re: [Amps] SPE 2K RTTY Duty Cycle (score: 1)
Author: "Roger (K8RI)" <>
Date: Sat, 23 May 2015 17:43:44 -0400
It is not the lack of regulation, although that is a contributor. The market builds and sells what the market wants. If a large enough portion of the market wanted clean signals, we'd have clean sign
/archives//html/Amps/2015-05/msg00175.html (13,760 bytes)

366. Re: [Amps] Why not use the ORANGE button? (score: 1)
Author: "Roger (K8RI)" <>
Date: Sun, 24 May 2015 03:28:02 -0400
I wanted a full size rig and the FT5000MP is all of that. It takes about the same 60 watts in class A to get the legal limit out of my DX-2sp. 75 watts is max for class A at which the amp draws the l
/archives//html/Amps/2015-05/msg00182.html (12,119 bytes)

367. Re: [Amps] Real danger to use the ORANGE button (score: 1)
Author: "Roger (K8RI)" <>
Date: Sun, 24 May 2015 03:35:02 -0400
It's not April 1st! 73 Roger (K8RI) -- This email has been checked for viruses by Avast antivirus software. _______________________________________________ Amps mailing list Amps
/archives//html/Amps/2015-05/msg00183.html (7,716 bytes)

368. Re: [Amps] Yaesu Orange Button (score: 1)
Author: "Roger (K8RI)" <>
Date: Sun, 24 May 2015 11:06:16 -0400
The "Orange button" is the Class A switch, but it should not be run at more than 75 Watts. It just switches the bias. 73 Roger (K8RI) On 5/24/2015 10:44 AM, greg greene wrote: " What about the Yaesu
/archives//html/Amps/2015-05/msg00185.html (7,695 bytes)

369. Re: [Amps] Real danger to use the ORANGE button (score: 1)
Author: "Roger (K8RI)" <>
Date: Mon, 25 May 2015 03:24:46 -0400
Jim, how far off the frequency were you listening? I may need to do some expirmenting, 120 watts is plenty. A clean signal at 120W is a bonus. The shop has been a disaster area, but the rerod tower b
/archives//html/Amps/2015-05/msg00194.html (8,696 bytes)

370. Re: [Amps] tetrode push-pull amp schematics (score: 1)
Author: "Roger (K8RI)" <>
Date: Sat, 20 Jun 2015 18:55:36 -0400
Isn't class A idle current max (tube dissipation) with max signal giving minimum dissipation? (The tube is never driven "into" cut off) Class B is at cutoff while class C is deep into cutoff?. 73 Rog
/archives//html/Amps/2015-06/msg00066.html (10,845 bytes)

371. [Amps] Old Tubes and IM numbers (score: 1)
Author: "Roger (K8RI)" <>
Date: Sat, 11 Jul 2015 20:41:37 -0400
In "the old days" we used to build amps out of most anything available, but back then tubes were cheap! So were my wages. Big tubes were expensive back then compared to the average wage. Rigs were si
/archives//html/Amps/2015-07/msg00031.html (9,233 bytes)

372. Re: [Amps] Re-imagining the 30S-1 (score: 1)
Author: "Roger (K8RI)" <>
Date: Mon, 13 Jul 2015 03:01:33 -0400
I'd build a new amp that would easily run the legal limit, any mode, no time limit. IF the transformer is good after baking out then restoration is likely the cheaper route, but use the SS tube repla
/archives//html/Amps/2015-07/msg00037.html (8,615 bytes)

373. Re: [Amps] Odd query.... (score: 1)
Author: "Roger (K8RI)" <>
Date: Fri, 24 Jul 2015 23:34:52 -0400
Back on the farm, when I was young, it was lard, bacon grease, and fresh churned butter. Boiled dinners or steaks and potatoes smothered in a thick, rich gravy. Eggs fried, submerged in bacon grease
/archives//html/Amps/2015-07/msg00127.html (8,347 bytes)

374. Re: [Amps] Odd query.... (score: 1)
Author: "Roger (K8RI)" <>
Date: Sat, 25 Jul 2015 04:21:29 -0400
Strange isn't it, that with those diets that heart attacks were rare. Now we have low fat, no fat, low cholesterol, what they deem healthy, yet we ate those foods which were the antithesis of of good
/archives//html/Amps/2015-07/msg00130.html (10,108 bytes)

375. Re: [Amps] Blower noise (score: 1)
Author: "Roger (K8RI)" <>
Date: Wed, 12 Aug 2015 04:08:56 -0400
That might be an answer, or a major problem. I believe the fan noise from the squirrel cage blower, is air flow, turbulence, and a resonance related to the number of blades the impeller speed, and po
/archives//html/Amps/2015-08/msg00035.html (9,151 bytes)

376. Re: [Amps] Ham sells fine grit thing to clean contacts (score: 1)
Author: "Roger (K8RI)" <>
Date: Mon, 17 Aug 2015 01:23:24 -0400
Crocus cloth is "I believe" jewelers rouge on a backing, but be careful. Some "cloth" is more abrasive than the abrasive. Bond paper with just enough deoxit to wet the paper. There have been several
/archives//html/Amps/2015-08/msg00054.html (10,643 bytes)

377. Re: [Amps] Amp output power (score: 1)
Author: "Roger (K8RI)" <>
Date: Sun, 23 Aug 2015 15:56:24 -0400
With 2400 watts dissipation, (3 tubes) at 62% I get almost 3,900 watts out continuous. The newer data sheet lists a max of 3,500 volts with a typical operating voltage of 3200 volts. 23 watts drive g
/archives//html/Amps/2015-08/msg00078.html (9,779 bytes)

378. Re: [Amps] Amp output power (score: 1)
Author: "Roger (K8RI)" <>
Date: Tue, 25 Aug 2015 02:38:25 -0400
The early datasheets showed larger figures than the later ones. Yes, I believe the derating was a political move to make the FCC happy<:-) Just remember when running near maximum ratings and particul
/archives//html/Amps/2015-08/msg00085.html (11,054 bytes)

379. Re: [Amps] Amp output power (score: 1)
Author: "Roger (K8RI)" <>
Date: Tue, 25 Aug 2015 08:51:40 -0400
I think I've seen, new imported 8877s of reported good quality for the price of two tested, 3CX800 pulls. 73 Roger (K8RI) It's a good idea to have sensitive and quick acting over drive protection. RE
/archives//html/Amps/2015-08/msg00087.html (9,228 bytes)

380. Re: [Amps] Amp output power (score: 1)
Author: "Roger (K8RI)" <>
Date: Fri, 28 Aug 2015 05:36:07 -0400
The PL172/8295As were notorious for going gassy with no use. I still have 4 of the 8295A ceramic versions, one of which is in a restored HT33B. I in addition to the 8877s and 3CX800s, I like the FU72
/archives//html/Amps/2015-08/msg00101.html (11,282 bytes)

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