- 181. Re: [Amps] Pre-Distortion Linearizer (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 04 May 2013 14:34:32 -0700
- The problem is that manufacturers are not going to be able to produce a "low end transceiver" - at least at the low end price point - that has all the features demanded by the marketplace. The techno
- /archives//html/Amps/2013-05/msg00080.html (12,112 bytes)
- 182. Re: [Amps] chassis maker? (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 04 May 2013 17:39:30 -0700
- Although I have a shear, that may not be the perfect solution. In order to cut thicker aluminum or steel, you need a 2,000 pound shear, which involves space. And, often they are not able to do more t
- /archives//html/Amps/2013-05/msg00085.html (11,040 bytes)
- 183. Re: [Amps] Pre-Distortion Linearizer (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 05 May 2013 19:48:40 -0700
- You have a point, Joe; both transmitters and receivers fall into different classes of performance depending on the price range. But there is still no valid reason for any transceiver to perform signi
- /archives//html/Amps/2013-05/msg00104.html (14,471 bytes)
- 184. Re: [Amps] Pre-Distortion Linearizer (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 05 May 2013 20:53:06 -0700
- You have a point, Joe; both transmitters and receivers fall into different classes of performance depending on the price range. But there is still no valid reason for any transceiver to perform signi
- /archives//html/Amps/2013-05/msg00106.html (13,334 bytes)
- 185. Re: [Amps] Pre-Distortion Linearizer (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 05 May 2013 21:42:30 -0700
- On 5/5/2013 4:19 AM, peter chadwick wrote: Manufacturers have gone mad about IMD in receivers but can you use it? e.g. a +40dBm TOIP with a 10dB NF. In SSB, that's an rx noise floor of -130dBm and an
- /archives//html/Amps/2013-05/msg00107.html (13,543 bytes)
- 186. [Amps] Commander 2500 value. (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Wed, 08 May 2013 22:41:37 -0400
- There's an estate sale a couple miles South of me and a Commander 2500 is being offered. I don't have the S#. They are asking $2 grand. There is a brand new Eimac 3CX800A7 spare tube for sale as well
- /archives//html/Amps/2013-05/msg00127.html (6,731 bytes)
- 187. Re: [Amps] 3CX1000A7 (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 19 May 2013 19:38:45 -0400
- It's a great tube There's a NOS on e-bay for $600. It's buy it now and I don't see a time limit. Don't know if they'll get it or not. Too bad it's from Powergridtube. They may be OK, but I don't like
- /archives//html/Amps/2013-05/msg00167.html (7,703 bytes)
- 188. Re: [Amps] Advice needed for SS amp (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Wed, 05 Jun 2013 20:09:34 -0400
- Sounds like what the State of Alabama uses to dispatch hardened criminals..... Water cooling is nice, but you are probably going to need either DI or distilled water at those voltages and water cooli
- /archives//html/Amps/2013-06/msg00055.html (9,006 bytes)
- 189. Re: [Amps] Advice needed for SS amp (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 06 Jun 2013 00:48:43 -0400
- Water cooling is nice, but you are probably going to need either DI or distilled water at those voltages and water cooling can be a royal PITA when things go wrong. REPLY: I realize the pitfalls, bu
- /archives//html/Amps/2013-06/msg00075.html (12,701 bytes)
- 190. Re: [Amps] Monitoring temperature in SS amp (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 14 Jun 2013 23:25:36 -0400
- On 6/12/2013 9:18 PM, John Lyles wrote: I agree with Manfred's assessment of temperature sensors around RF amps. The BE FM broadcast transmitters always had an LM35 mounted on a small PCB above the c
- /archives//html/Amps/2013-06/msg00223.html (8,933 bytes)
- 191. Re: [Amps] Miller-Larson effect on thoriated tungsten filaments (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Wed, 26 Jun 2013 20:12:21 -0400
- On 6/26/2013 7:14 PM, Jim Thomson wrote: Date: Tue, 25 Jun 2013 09:14:39 -0400 From: "Carl" <km1h@jeremy.mv.com> To: "Mike Waters" <mikewate@gmail.com>, <amps@contesting.com> Subject: Re: [Amps] Mill
- /archives//html/Amps/2013-06/msg00259.html (13,586 bytes)
- 192. Re: [Amps] Build the Big Amp (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Wed, 26 Jun 2013 20:20:06 -0400
- http://www.techshop.ws/ I like the hand held plasma cutter..... Hold my beer and watch this.... I have one that will cut 3/4" steel plate at 10" per minute. It's no bigger than the lunchbox I used to
- /archives//html/Amps/2013-06/msg00260.html (7,923 bytes)
- 193. Re: [Amps] Source of Mica Caps? (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 05 Jul 2013 22:21:47 -0400
- Carl KM1H I'm not so sure honestly. If a 3CX10000B7 amp happened to turn up wired up and ready to go, they <snip> I can honestly say that I've never contemplated one on that scale. Now maybe 40 amps,
- /archives//html/Amps/2013-07/msg00028.html (7,886 bytes)
- 194. Re: [Amps] Help constructing filament choke for pair of (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 08 Jul 2013 15:38:47 -0400
- The standard ferrite rod that you use for 10-80M works fine. I've modded quite a few amps for 6 M and I remove half the turns from the original choke. This reduces the inductance by a factor 4 and wo
- /archives//html/Amps/2013-07/msg00039.html (8,178 bytes)
- 195. Re: [Amps] Standby/Operate indicators for Henry Amps (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Tue, 23 Jul 2013 18:29:11 -0400
- All I really need is the square "Red Operate Lens" but having an entire unit would be good too. I purchased them directly from Henry. They probably still have them in stock BTW never put brighter bul
- /archives//html/Amps/2013-07/msg00060.html (8,384 bytes)
- 196. Re: [Amps] testing the biggest one (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 02 Aug 2013 19:30:07 -0400
- . I challenge the same pundits to come up with a superior way to generate RF power. Maybe in the sun? REPLY: How about the Internet? Seriously, the days of super power broadcast transmitters are com
- /archives//html/Amps/2013-08/msg00006.html (9,291 bytes)
- 197. Re: [Amps] OTA TV (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 05 Aug 2013 15:28:17 -0400
- In this area of flat land farming everyone had outdoor antennas. The nearest station was over 30 miles with three others at roughly 50 to 60 miles. Eventually cable did come into the high density are
- /archives//html/Amps/2013-08/msg00045.html (10,626 bytes)
- 198. Re: [Amps] Dummy load. Can distilled water be used instead of (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 12 Aug 2013 15:15:39 -0400
- On 8/12/2013 12:24 PM, Jim Thomson wrote: Date: Sun, 11 Aug 2013 18:29:57 +0200 From: peter chadwick <g8on@fsmail.net> To: Chris Wilson <chris@chriswilson.tv>, amps@contesting.com Subject: Re: [Amps]
- /archives//html/Amps/2013-08/msg00090.html (10,302 bytes)
- 199. Re: [Amps] GU-74b amp by UX1UX (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 16 Aug 2013 20:13:54 -0400
- Rudy uses the FU728F instead of the GU84B. The Chinese FU728F is basically a 4CX1500B except it has a different filament voltage and the centering pin in the socket is slightly larger than the one f
- /archives//html/Amps/2013-08/msg00106.html (11,365 bytes)
- 200. Re: [Amps] why a tube fails ? (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Wed, 28 Aug 2013 01:31:12 -0400
- On 8/27/2013 11:00 PM, Jim Garland wrote: Hi Charles, Very intersesting questions! I can't help you with your question about tube failure modes, though I know at least one mode with indirectly heated
- /archives//html/Amps/2013-08/msg00139.html (10,491 bytes)
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