Search String: Display: Description: Sort:

Results:

References: [ +from:w9ac@arrl.net: 640 ]

Total 640 documents matching your query.

341. Re: [Amps] Fwd: Re: soldering vs crimping (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 2 May 2012 13:35:13 -0400
When I was working for RKO Radio in Chicago back in the early '80s, we analyzed return loss measurements of various crimp v. soldered connections. This was an important consideration when measuring
/archives//html/Amps/2012-05/msg00068.html (9,739 bytes)

342. Re: [Amps] Mismatch loss (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 2 May 2012 20:46:28 -0400
That's probably true for most operating. When connectors are used for calibration purposes, even the smallest discontinuity changes or QC variance can show up. For example, when conducting OSL calib
/archives//html/Amps/2012-05/msg00095.html (11,131 bytes)

343. Re: [Amps] DRAKE L4B ON EBAY/ extraordinary price (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 6 Jun 2012 09:58:07 -0400
At nearly every hamfest I attend, I get drawn in to inspecting the Ameritron amps. Usually, the covers are removed so the components are easily observed. The AL series transformer may be more robust
/archives//html/Amps/2012-06/msg00028.html (12,385 bytes)

344. Re: [Amps] Alpha PA77 vs 77Dx plate choke? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 18 Jun 2012 13:16:37 -0400
Another option is to contact Dick Byrd, N4UQ. At one time, he was running an exchange program where the user sent in a B&W 801 or 802. He then sent out a pre-wound 802 with a heavier gauge winding. N
/archives//html/Amps/2012-06/msg00245.html (11,549 bytes)

345. Re: [Amps] Alpha PA77 vs 77Dx plate choke? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 19 Jun 2012 09:15:25 -0400
ETO used 3M #27 glass tape. Still widely available. http://tinyurl.com/ceu967w Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin
/archives//html/Amps/2012-06/msg00273.html (8,545 bytes)

346. Re: [Amps] Overdrive protection (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 26 Jul 2012 13:02:36 -0400
Vic, I believe the firmware already does this, even going back to the 86. In the newer amps, the log is probably there: (1) to assist in troubleshooting and repairs; and (2) to provide Alpha the evid
/archives//html/Amps/2012-07/msg00271.html (9,678 bytes)

347. Re: [Amps] Overdrive protection (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 27 Jul 2012 11:59:21 -0400
It's probably worth distinguishing between the two types of RF power controls commonly found on moden transceivers. We all know that the RF Output Contol is used to adjust the nominal power of the t
/archives//html/Amps/2012-07/msg00308.html (11,235 bytes)

348. Re: [Amps] Overdrive protection (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 28 Jul 2012 10:35:33 -0400
Joe, According to the operating manual, the FTdx-5K's E.ALC switch is used to change ALC recovery time (not gain), supposedly for optimized operation into the VL-1000 solid-state amp. The alternate s
/archives//html/Amps/2012-07/msg00333.html (13,329 bytes)

349. Re: [Amps] 3CX1500A7/8877 vs el cheapo GS-35B (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Jul 2012 13:01:13 -0400
Or, consider re-buildable directly-heated cathode types that may, or already have, gone out of production, but where sufficient usage across industries will keep rebuilders like Econco and Zonum in b
/archives//html/Amps/2012-07/msg00417.html (8,017 bytes)

350. Re: [Amps] Al80b (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Jul 2012 13:26:24 -0400
12:1 represents an infinte set of Z values. Perhaps he's lucky and that 12:1 SWR is a point on the Smith Chart where the AL's output network can still perform the tune and match function between the
/archives//html/Amps/2012-07/msg00422.html (10,675 bytes)

351. Re: [Amps] Al80b (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Jul 2012 16:37:14 -0400
Steve & Vic, Really good points. If he's using a meter with a simple directional coupler (e.g., Monimatch, Bruene, Bird Thruline), then I would expect the indicated forward power reading to increase
/archives//html/Amps/2012-07/msg00427.html (11,729 bytes)

352. Re: [Amps] another "new" amp coming? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 3 Aug 2012 10:17:53 -0400
Looks like QRO is using a RFC on the filament rather than let 10A of AC return current flow on the chassis like the 77Dx design. It appears that in doing so, they tied filament and cathode together l
/archives//html/Amps/2012-08/msg00078.html (9,383 bytes)

353. Re: [Amps] 8877 cathode-filament question (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 3 Aug 2012 21:02:26 -0400
Jim, I struggled with this issue when modifying my 77Dx. The current GG configuration is like the Henry 3KD with no connection between cathode and filament. This is unlike the AL-1500 where the two e
/archives//html/Amps/2012-08/msg00086.html (10,454 bytes)

354. [Amps] ALC Overshoot FTDX-5000 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 14 Aug 2012 15:32:10 -0400
I suspect the Powermaster samples much like the LP-100A. N8LP informed me that 100% detectability occurs in 7-10 ms with his wattmeter. So, I think Joe is correct in that a scope is required for sho
/archives//html/Amps/2012-08/msg00205.html (8,045 bytes)

355. Re: [Amps] 87a will tell you, too (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 15 Aug 2012 10:36:40 -0400
That's not right. It's an occurrence only when the menu-driven TX Gain is not calibrated at the 5W/50W set points. The easiest remedy is to use the K3 software utility. In the utility, select the ta
/archives//html/Amps/2012-08/msg00211.html (9,406 bytes)

356. Re: [Amps] 87a will tell you, too (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 15 Aug 2012 12:44:14 -0400
Or, a used Tektronix 465/465B for about USD $250 on the used market. Moving up in technology, Owon, Rigol, and Hantek have new 100MHz 2-channel digital storage scopes with 1G+ digital sampling. The O
/archives//html/Amps/2012-08/msg00216.html (8,390 bytes)

357. Re: [Amps] 87a will tell you, too - measuring overshoot (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 15 Aug 2012 22:16:56 -0400
There are several scope suppliers from China, Rigol being one. They're probably accurate and reliable enough and I believe Wes Hayward, W7ZOI uses one in his design work. At the recommendation of Je
/archives//html/Amps/2012-08/msg00236.html (8,170 bytes)

358. Re: [Amps] Alpha &&DX Conversion (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 4 Sep 2012 21:20:24 -0400
Larry, You've gotta' really want to add the 2nd tube for a good reason. The 77Dx is already capable of 2500w+ output power. Apart from bragging rights, I'm just not sure why anyone wants or needs the
/archives//html/Amps/2012-09/msg00046.html (8,938 bytes)

359. Re: [Amps] Alpha &&DX Conversion (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 5 Sep 2012 17:48:15 -0400
This may be an interesting point of reference. During my college years, I worked at a 3KW FM station in Rockford, IL as its chief engineer. The transmitter was an AEL FM-2.5K (FCC type accepted to 2
/archives//html/Amps/2012-09/msg00065.html (8,071 bytes)

360. Re: [Amps] Alpha &&DX Conversion (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 5 Sep 2012 18:04:50 -0400
Vic, Valid point but the FCC- registered efficiency was 58% and is typical of an FM broadcast GG design. The AEL FM 2.5K is a GG design and not tetrode-based as were the more common FM broadcast tran
/archives//html/Amps/2012-09/msg00067.html (10,491 bytes)

Current List: 341 - 360
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
This search system is powered by Namazu