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281. [AMPS] Re: FS : 24-28VDC Supplies (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Mon, 4 Jan 1999 08:10:57 -0500; WOOPS, I gave the wrong E-Mail adr. Try wait@worldpath.net Sorry to all that replied to me. 73 Carl KM1H ___________________________________________________________________ You don't need to buy Inte; /archives//html/Amps/1999-01/msg00056.html (6,963 bytes)
282. [AMPS] TX Ant gain vs. RX Ant gain (was: Dollars per dB) (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Mon, 4 Jan 1999 08:53:52 -0500; I did not measure but was told that the stock TS-940 has a 12-13dB NF at 28MHz. The preamp at 1dB NF/10dB gain gave me a system NF of roughly 5dB. There were several times that the preamp improved th; /archives//html/Amps/1999-01/msg00057.html (9,944 bytes)
283. [AMPS] Dollars per dB (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Mon, 4 Jan 1999 09:09:38 -0500; Yep, that was pushing it to the extreme but I suspect we all know of at least one of those! All too true. Worked a number of guys on 6/2M MS Sunday that commented that it was nice to hear me on the a; /archives//html/Amps/1999-01/msg00058.html (13,318 bytes)
284. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 5 Jan 1999 12:04:29 -0500; The SB-220 is a poor example to use for efficiency but it speaks volumes if this discussion wants to get into total network design, component selection and not just the tank coil. At 2KW input the av; /archives//html/Amps/1999-01/msg00080.html (11,273 bytes)
285. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 5 Jan 1999 11:50:37 -0500; Far from a new discussion, in fact it was discussed at length about a month or two ago. Check the archives for some backround. As far as efficiency is concerned I suspect that you are only partially; /archives//html/Amps/1999-01/msg00081.html (12,590 bytes)
286. [AMPS] Need SB220 bandswitch (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 7 Jan 1999 00:59:52 -0500; I have complete input assemblies, switch, coils and caps. Removed as a single assembly from 6M conversions. $50 shipped. Output wafers, same as above; either excellent original or rebuilt with new pa; /archives//html/Amps/1999-01/msg00085.html (7,889 bytes)
287. [AMPS] Fw: Fw: 3.2KV Plate Transformers, Two IDENTICAL Units Available (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 7 Jan 1999 00:49:46 -0500; Contact him, NOT me. 73 Carl KM1H -- To: <amps@contesting.com> transformers ___________________________________________________________________ You don't need to buy Internet access to use free Inter; /archives//html/Amps/1999-01/msg00086.html (8,333 bytes)
288. [AMPS] arcing in tube? (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 7 Jan 1999 11:15:04 -0500; On Thu, 07 Jan 1999 09:30:55 Dick McDuffie <ny1e@server.nlbbs.com> writes: Crank up the idle current until the plate shows red Dick, let cook for several hours with lots of air. You might have to do; /archives//html/Amps/1999-01/msg00092.html (7,906 bytes)
289. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 7 Jan 1999 11:09:46 -0500; Yeah, Heathkits....not voodoo. Exactly the point I was trying to make yesterday. It is not the SB-220 tank coil that is at fault since I use the same 10M coil on 6M and it works just fine at 60+ % ef; /archives//html/Amps/1999-01/msg00093.html (12,452 bytes)
290. [AMPS] arcing in tube? (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 7 Jan 1999 12:07:23 -0500; I decided to sell off my 4-1000A "collection" about 4 years ago. Of the 33 tubes I had only 2 were thrown away. About 5, if I recollect, took many hours of very red plates but they all recovered and; /archives//html/Amps/1999-01/msg00097.html (8,957 bytes)
291. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 8 Jan 1999 02:35:32 -0500; On Thu, 07 Jan 1999 16:56:40 -0500 "Roger D. Johnson" <n1rj@pivot.net> writes: I just reread that article and now see why I originally shelved it. A lot of it is pretty much a copy of Rich's ideas (; /archives//html/Amps/1999-01/msg00109.html (9,943 bytes)
292. [AMPS] E F Johnson Roller (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 8 Jan 1999 03:27:46 -0500; On Thu, 07 Jan 1999 21:41:04 -0800 Arne Gjerning <gjerning@flash.net> writes: Unshorted turns can result in a Tesla coil effect...lots of arcs! But shorted turns can result in a closed loop resonant; /archives//html/Amps/1999-01/msg00110.html (9,157 bytes)
293. [AMPS] Henry Roller Coil (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 8 Jan 1999 03:36:36 -0500; My experience with roller coils in ham applications has been consistently bad. They were not designed for constant (rotary) use as we hams tend to do. Instead they were/are used primarily in channeli; /archives//html/Amps/1999-01/msg00111.html (9,074 bytes)
294. [AMPS] Henry Roller Coil (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 8 Jan 1999 03:33:14 -0500; Johnson has not made those coils for roughly 20 years. Johnson, LaPointe and Multronics all sold out to Cardwell. If you want sticker shock get their catalog. 73 Carl KM1H ___________________________; /archives//html/Amps/1999-01/msg00112.html (9,418 bytes)
295. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 8 Jan 1999 11:05:18 -0500; Not very believable or likely Rich. A contact spacing of .188" is barely adequate for 2700V of RF. Who is this "we" Kemo Sabe? The last time I looked at my birth certificate it did not say Tonto. ___; /archives//html/Amps/1999-01/msg00121.html (10,808 bytes)
296. [AMPS] Plate load charts (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sat, 9 Jan 1999 10:44:28 -0500; I sure do Rich or did you forget that I got the cap from you? So what voltage AC RMS have you tried or was it strictly DC? ___________________________________________________________________ You don; /archives//html/Amps/1999-01/msg00123.html (9,968 bytes)
297. [AMPS] Tesla coil effects in open turns of coils (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Mon, 11 Jan 1999 10:14:54 -0500; SNIP Several ham amps including the MLA-2500 use a non shorting switch with no apparent problem. I have never replaced one anyway. The key to success may be in selecting the switch ratings to begin w; /archives//html/Amps/1999-01/msg00142.html (8,097 bytes)
298. [AMPS] Rapid Warmup Indirectly Heated Cathode Tubes (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Mon, 11 Jan 1999 12:09:39 -0500; On Mon, 11 Jan 1999 07:40:29 -0800 dan hearn <dhearn@ix.netcom.com> writes: Great retort Dan! I believe it was mentioned on the reflector that leaving the filaments on indirectly heated tubes continu; /archives//html/Amps/1999-01/msg00144.html (11,340 bytes)
299. [AMPS] SB-220 Meter Replacement (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 12 Jan 1999 01:13:36 -0500; There are actually 3 HM-102 meters in use. The original had the large diameter movement and was USA made. The small one is electrically identical and is from Japan. The third is a completely differen; /archives//html/Amps/1999-01/msg00154.html (8,890 bytes)
300. [AMPS] Info tubes CW-715B ?? (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 12 Jan 1999 01:02:40 -0500; They are old WW2 pentodes used as pulse modulators. They will work up to 6M. The filaments are 24V and the sockets are very hard to find. Typical ham use ran 1500V on the anode and 350-400V on the sc; /archives//html/Amps/1999-01/msg00155.html (8,169 bytes)

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