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241. Re: [Amps] Dedicated RF (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 28 Jul 2012 16:32:08 -0500
I'm not impressed. I see another ham amp attempt to idiot proof the box and make it a lot harder for a regular guy to work on, fix or modify/improve. I'd be a lot happier if they just made a basic no
/archives//html/Amps/2012-07/msg00343.html (8,451 bytes)

242. Re: [Amps] Dedicated RF (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 29 Jul 2012 15:37:34 -0500
After you have designed a s.s. linear RF amplifier covering the range of 1.8 to 30 MHz and providing around 12 dB gain or more continuously 100% duty cycle, meeting FCC spectral purity requirements a
/archives//html/Amps/2012-07/msg00362.html (9,374 bytes)

243. Re: [Amps] Dedicated RF (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 29 Jul 2012 19:13:27 -0500
There is a tremendous difference. QRO solid state design has a whole different set of issues. Go to a show and talk to someone who has done it and brought it to market. As far as I know, the only out
/archives//html/Amps/2012-07/msg00376.html (10,283 bytes)

244. Re: [Amps] Dedicated RF (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 29 Jul 2012 19:16:22 -0500
My ears are burning _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-07/msg00377.html (9,387 bytes)

245. Re: [Amps] Dedicated RF (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 30 Jul 2012 12:25:38 -0500
I run a pair of 10 year old chinese RFP 3-500ZG regularly at 300 - 350 w. AM and long transmissions with no problems at all. If I need more I'd buy new ones from Ameritron or RFP before I'd gamble on
/archives//html/Amps/2012-07/msg00421.html (8,640 bytes)

246. Re: [Amps] 3CX1500A7/8877 vs el cheapo GS-35B (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 31 Jul 2012 19:32:55 -0500
if you genuinely believe that then I guess you'll be the next one to get popped for transoceanic aviation QRM. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2012-07/msg00461.html (9,368 bytes)

247. Re: [Amps] The dilemma of Tx tube (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 1 Aug 2012 19:37:39 -0500
The eimac triode connected g.g. cathode driven data sheet for the 4x1 has specifications for 3, 4 and 5 KV. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.
/archives//html/Amps/2012-08/msg00028.html (7,455 bytes)

248. Re: [Amps] The dilemma of Tx tube (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 2 Aug 2012 07:06:53 -0500
Eimac issued engineering newsletter FCJ-59D2 superseding 59B5 which set forth an exception for the 4-1000A as a high mu triode provided Ep is at least 3 KV. It listed typical operating conditions. 73
/archives//html/Amps/2012-08/msg00042.html (9,244 bytes)

249. Re: [Amps] 87a will tell you, too (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 15 Aug 2012 12:07:03 -0500
that's way too high. You can get a Tek 475 for around $100 now. All these great Tek scopes from the 1970s are a steal now. Slow one down, turn up the trace and dim the lights and you'll see your over
/archives//html/Amps/2012-08/msg00217.html (8,655 bytes)

250. Re: [Amps] Blue Disc Ceramic caps ?? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 17 Aug 2012 05:25:47 -0500
v. rating is only part of it; I think Hank is probably wanting to know if they are class 2 and what the dielectric temp. code is. Choose caps for RF carefully. rob k5uj ______________________________
/archives//html/Amps/2012-08/msg00269.html (7,951 bytes)

251. Re: [Amps] Parasitic Resister Value (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 17 Aug 2012 12:39:18 -0500
Measurements 59 rob k5uj _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-08/msg00276.html (7,588 bytes)

252. Re: [Amps] Blue Disc Ceramic caps ?? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 17 Aug 2012 12:43:50 -0500
it turned out the blue ones in question were class SL. those caps are equivalent to Class 1 caps and are considered okay for low power applications such as blocking in VFOs and receivers (if you can
/archives//html/Amps/2012-08/msg00277.html (9,806 bytes)

253. Re: [Amps] Blue Disc Ceramic caps ?? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 17 Aug 2012 12:45:16 -0500
the seller will supply screws (mine did at least) but they were steel. McMaster Carr has brass metric. rob k5uj _______________________________________________ Amps mailing list Amps@contesting.com h
/archives//html/Amps/2012-08/msg00278.html (8,222 bytes)

254. Re: [Amps] Blue Disc Ceramic caps ?? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 17 Aug 2012 18:41:25 -0500
some steel alloys heat up when conducting RF. Not all do but it is difficult to tell which do, and do not visually, so it is preferable to avoid steel as a series RF conductor. Non-ferrous alloys or
/archives//html/Amps/2012-08/msg00292.html (9,130 bytes)

255. Re: [Amps] Parasitics Resistor Value (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 17 Aug 2012 18:54:13 -0500
Those were good books but I'll bet he didn't use a 59. They were reprinted but also revised in some way I can't now recall--I only remember thinking that they were no good to read anymore. Maybe in t
/archives//html/Amps/2012-08/msg00293.html (7,766 bytes)

256. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 25 Aug 2012 19:09:14 -0500
Everything I ever heard about that rig was that it was a nightmare to run. A few years ago at a series of local hamfests the chief at the 1160 station here parted out theirs and many hams happily ca
/archives//html/Amps/2012-08/msg00423.html (9,096 bytes)

257. Re: [Amps] Vacuum Variable Help Needed (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 26 Aug 2012 07:09:51 -0500
You don't have to have thousands of dollars in tools. You can do a lot with a table top drill press, some hand tools, a fixed saber saw and vise. The vise can be used to make sheet metal bends with t
/archives//html/Amps/2012-08/msg00438.html (10,059 bytes)

258. Re: [Amps] Can some explain this curious eBay auction (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 26 Aug 2012 17:36:09 -0500
I have never seen or heard of "private" feedback until now, but I have a guess as to why it is used. Assuming it is a user option that can be chosen, it gets to the reason why eBay started going wit
/archives//html/Amps/2012-08/msg00454.html (10,609 bytes)

259. Re: [Amps] Can some explain this curious eBay auction (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 27 Aug 2012 05:41:49 -0500
If they show up again we'll know something slippery went on. Meanwhile, the world of "hi fi" glass audio is shrinking my head and I have to avoid it and stay with radio. 73 Rob K5UJ ________________
/archives//html/Amps/2012-08/msg00464.html (9,731 bytes)

260. Re: [Amps] current threads about silver solder and resoldering (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 1 Sep 2012 19:45:20 -0500
You can still go out to stores in US and buy solder with lead. I went to buy some yesterday (new solder in stores is expensive). I have a lot of tin/lead solder cheap from hamfests but for outdoor ju
/archives//html/Amps/2012-09/msg00009.html (8,093 bytes)


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