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261. Re: [Amps] Alpha 78 problem (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 10 Nov 2007 10:54:38 -0500
I dont have the manuals handy but Id suspect that 15A ceramic fuses are sufficient on a 240VAC line. I use 12A in 1200W output amps. Carl KM1H _______________________________________________ Amps mai
/archives//html/Amps/2007-11/msg00133.html (7,920 bytes)

262. Re: [Amps] Over running modulation /AF transformers (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 10 Nov 2007 18:57:20 -0500
Well, limiting may be a limiting factor; pardon the pun. Since I'm going to be using some audio processing and negative peak limiting my average power will be up a fair amount. Im also going to be bo
/archives//html/Amps/2007-11/msg00138.html (7,735 bytes)

263. Re: [Amps] operating a transformer in oil (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 11 Nov 2007 07:53:21 -0500
Ive seen mention of that method Peter but how do you calculate the choke value? Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
/archives//html/Amps/2007-11/msg00142.html (7,933 bytes)

264. Re: [Amps] operating a transformer in oil (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 11 Nov 2007 08:04:00 -0500
It certainly does complicate things. Modulation transformers are constructed differently also so they can function with that DC in both windings. Im going to have to dig out my ancient Terman and oth
/archives//html/Amps/2007-11/msg00143.html (10,335 bytes)

265. Re: [Amps] Bird 1KW+ Load Resistor (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 11 Nov 2007 08:30:50 -0500
Load resistors are usually Carborundum (trade name) or similar and come in a wide range of values and wattages. They are pricey new but do show up on Ebay and flea markets once in awhile. Bring an Oh
/archives//html/Amps/2007-11/msg00145.html (9,350 bytes)

266. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 11 Nov 2007 14:27:36 -0500
That was Carl who wrote that. As you may know, the Carborundums are fragile being not much more than powdered carbon granules molded and held together by some bonding agent. I used a Dremel cut-off d
/archives//html/Amps/2007-11/msg00153.html (9,453 bytes)

267. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 12 Nov 2007 10:13:35 -0500
As one forum member pointed out 50KW BCB water cooled dummy loads use nichrome elements with a fixed cap to cancel the reactance. That is not a "narrow range". Measuring a true non inductive resistor
/archives//html/Amps/2007-11/msg00160.html (9,179 bytes)

268. Re: [Amps] 3-500ZG RF Parts tubes (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 12 Nov 2007 11:27:08 -0500
Ive bought large quantities of Chinese over the years and can tell no difference among what is currently available. You pay more for the luxury of a private brand with a dubious warranty. The early C
/archives//html/Amps/2007-11/msg00162.html (8,121 bytes)

269. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 12 Nov 2007 12:17:29 -0500
Youre missing the point; again. I said BCB, not one frequency. The loads covered up to 1500 KHz or so and above that the cap had to be changed. I see no reason why an inductive resistor cant be used
/archives//html/Amps/2007-11/msg00165.html (8,839 bytes)

270. Re: [Amps] How many other Hunter Bandit 2000C owners out there? (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 12 Nov 2007 12:20:50 -0500
That was available as a kit or wired. Ive converted a few to 6M; havent seen one or the earlier versions in years. Carl KM1H _______________________________________________ Amps mailing list Amps@con
/archives//html/Amps/2007-11/msg00166.html (8,380 bytes)

271. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 12 Nov 2007 12:58:11 -0500
Since it was used succcessfuly by a Gates installation team in the 60's that statement is irrelevant. 540-1700 kHz is a 3:1 range. Without knowing the actual construction of the load or resistive ele
/archives//html/Amps/2007-11/msg00170.html (9,643 bytes)

272. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 12 Nov 2007 15:46:07 -0500
Jim, how about backing into Elsie with a .01 cap as that is what I believe Gates used in that load. With large diameter nichrome elements arranged in an array that minimized coupling I would have to
/archives//html/Amps/2007-11/msg00177.html (10,272 bytes)

273. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 12 Nov 2007 17:40:24 -0500
What about the other resistors? Immersed in oil they could handle some power. The Heath Cantenna used a 50W element. As mentioned earlier I was looking at single band applications at 1.8 and 3.8 MHz,
/archives//html/Amps/2007-11/msg00180.html (10,264 bytes)

274. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 13 Nov 2007 13:17:51 -0500
Excellent idea David; I never heard of them before. I see that Mouser carries the 100W version in stock. Ive just ordered a pair of 100 Ohm from Mouser and will see how they look for RF as well as ho
/archives//html/Amps/2007-11/msg00189.html (9,343 bytes)

275. Re: [Amps] Caddock power resistors (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 13 Nov 2007 16:36:22 -0500
Mouser has them at a bit over $9 in single qty. Go to the Caddock page, click on distributors and then Mouser. Scroll down to the value/wattage you want. Or maybe just go to Mouser and type Caddock.
/archives//html/Amps/2007-11/msg00196.html (9,777 bytes)

276. [Amps] Modulation Xfmr Wanted (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 15 Nov 2007 12:46:45 -0500
This is my monthly plea for some big iron. Anything that can handle 750W of audio and up. Even a 2.5KW or 5KW BC unit if its within driving distance. Impedance ratios not critical, I can design to co
/archives//html/Amps/2007-11/msg00207.html (6,272 bytes)

277. Re: [Amps] 8877 plate voltage (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 15 Nov 2007 13:45:02 -0500
An 8877 will hi pot well over 10KV so that standing voltage is no problem. However operating at more than 4KV is asking for problems as many have found out. We get into uncharted territory of instabi
/archives//html/Amps/2007-11/msg00209.html (7,782 bytes)

278. Re: [Amps] 8877 Filament choke (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 15 Nov 2007 18:29:14 -0500
6M is VHF, use a choke there and on higher bands. A 4" 43 mix 1/2" ferrrite rod about 75% filled with #14 works well. Smaller wire can be used if you have to fine tune the filament voltage. Carl KM1H
/archives//html/Amps/2007-11/msg00214.html (10,287 bytes)

279. Re: [Amps] Using HV rectifiers from microwave ovens (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 16 Nov 2007 10:10:10 -0500
With such a close match why bother? I would be more concerned about using those diodes at all since you will be running them with only a small margin. Do you know their full specs? A typical commerci
/archives//html/Amps/2007-11/msg00221.html (10,032 bytes)

280. Re: [Amps] Bird 1KW+ Load Resistor (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 17 Nov 2007 11:21:48 -0500
I believe that MFJ uses or used to have non inductive Globar style resistors in their loads. These were imports of course. They may be available from them at a reasonable cost. Carl KM1H ____________
/archives//html/Amps/2007-11/msg00226.html (11,392 bytes)

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