Search String: Display: Description: Sort:

Results:

References: [ +from:charlie-cunningham@nc.rr.com: 476 ]

Total 476 documents matching your query.

221. Topband: FW: Insulator problems- Notr og caution (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 16 Dec 2013 18:09:08 -0500
All good points. We have used gray UV-stabilized poly carbonate to mold covers for electricity watt-hour meters that had some rather stringent requirements fr with standing ambient sunlight. The prob
/archives//html/Topband/2013-12/msg00184.html (10,203 bytes)

222. Re: Topband: 2 Top Band Christmas Gifts (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Fri, 20 Dec 2013 12:56:25 -0500
Been there - done that - without snowshoes, however, down here in North Carolina! Merry Christmas! Charlie, K4OTV Two special gifts this Christmas : 1. 9 year old g'son Elliot helped with my tree and
/archives//html/Topband/2013-12/msg00207.html (8,237 bytes)

223. Re: Topband: DX-100 adventure - progress (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Fri, 20 Dec 2013 23:00:45 -0500
BTW, Biii - tip/suggestion - for those series-connected electrolytics you probably should put a pair of equal value resistors - one across each series capacitor, as the leakage currents will not be e
/archives//html/Topband/2013-12/msg00210.html (10,920 bytes)

224. Re: Topband: DX-100 adventure - progress (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Sat, 21 Dec 2013 00:21:11 -0500
Hi, Bill! That's great! You're good to go with the elecrolytics, then! BTW - as for the chirp on the signal - the DX-100 VFO and voltage regulator was pretty much what they sold separately as the VF-
/archives//html/Topband/2013-12/msg00212.html (9,713 bytes)

225. Re: Topband: DX-100 adventure - progress (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Sat, 21 Dec 2013 13:27:24 -0500
I REALLY don't care for connecting electrolytics in series. However, Bill does say that the DX-100 already is configured with individual bleeders across each capacitor in those series pairs - so he m
/archives//html/Topband/2013-12/msg00216.html (10,024 bytes)

226. Re: Topband: DX-100 adventure - progress (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Sat, 21 Dec 2013 13:32:24 -0500
Diodes across the electrolytics ro prevent reverse chargin would probably be a good idea. 1N4007 1000 PIV, 1 A rectifiers should do nicely. It is worse than that. With a single bleeder for two series
/archives//html/Topband/2013-12/msg00217.html (9,515 bytes)

227. Re: Topband: DX-100 adventure - progress (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Sat, 21 Dec 2013 14:32:26 -0500
After reflecting on your point, that is obviously true, Tom, I would go ahead and spend a few cents on some rectifiers to put across those electrolytics! Operating electrolytics in series is just som
/archives//html/Topband/2013-12/msg00218.html (10,516 bytes)

228. Re: Topband: Digital mode spurious issues (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 30 Dec 2013 18:13:47 -0500
I would think that IMD products in a high-level PA that is over-driven beyond good linearity limits could add some junk in the "undesired sideband"? FWIW Charlie, K4OTV No, Joe Taylor's protocols are
/archives//html/Topband/2013-12/msg00280.html (11,158 bytes)

229. Re: Topband: Digital mode spurious issues (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 30 Dec 2013 21:34:26 -0500
Hi, Jim Well as one who has been an RF and radio engineer and designer for 40+ years, I have to agree with most all of your points. Great deal of truth in there, but so many guys don't appreciate all
/archives//html/Topband/2013-12/msg00286.html (13,635 bytes)

230. Re: Topband: Digital mode spurious issues (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 30 Dec 2013 23:28:41 -0500
Well, I certainly have to agree, Tom, if the signal on the desired sideband is just a single shifting tone. Might get messier if an sudio stage or A/D is driven into limiting and producing harmonic d
/archives//html/Topband/2013-12/msg00290.html (12,476 bytes)

231. Re: Topband: Digial mode spurious issues (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Thu, 2 Jan 2014 11:52:15 -0500
Yes, it really is just baseband audio into an SSB transmitter. And some of the new rigs that run that process audio through A/D converters to digitize if for DSP are just asking for trouble. I guess
/archives//html/Topband/2014-01/msg00010.html (10,591 bytes)

232. Re: Topband: Digial mode spurious issues (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Thu, 2 Jan 2014 21:38:35 -0500
True!! Like it or not, all digital transmitters and all digital modes except old direct FSK are essentially SSB transmitters with a subcarrier on which the digital information has been modulated. The
/archives//html/Topband/2014-01/msg00022.html (12,508 bytes)

233. Re: Topband: Radial Question (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 6 Jan 2014 17:00:06 -0500
I'd stay with the elevated radials,Bob! They're hard to beat! For some years I had an 70 ft tall inverted L at a back corner of my lot. I had only two elevated resonant radials 90 degrees apart on th
/archives//html/Topband/2014-01/msg00034.html (9,992 bytes)

234. Re: Topband: Radial Question (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 6 Jan 2014 17:39:11 -0500
Makes sense and agrees with my experience, Gary! BTW, I have worked Alaska from here in Raleigh with my 2-elevated radial Inverted L. Don't recall off-hand if it was you, I worked. 73, Charlie, K4OTV
/archives//html/Topband/2014-01/msg00037.html (9,135 bytes)

235. Re: Topband: Radial Question (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 6 Jan 2014 17:52:50 -0500
Hi, Bill Well, I have modeled a 160 inverted L with 4 elevated resonant radials, with EXNEC, and that's about as good as it gets! Guys with grounded towers have to dig and bury radials or run 'em on
/archives//html/Topband/2014-01/msg00038.html (10,914 bytes)

236. Re: Topband: Radial Question (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 6 Jan 2014 18:02:12 -0500
BTW, Biil, where U in NC? I'm in Raleigh waitin' for it to go down to 9 degrees tonight! 73, Charlie, K4OTV --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Bil
/archives//html/Topband/2014-01/msg00039.html (11,033 bytes)

237. Re: Topband: Radial Question (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 6 Jan 2014 21:40:46 -0500
Well, I'm not surprised at all, Bill! Some years back some broadcast engineers did a lot of work replacing deteriorated buried radial fields under broadcast towers with elevated resonant radials. The
/archives//html/Topband/2014-01/msg00042.html (13,321 bytes)

238. Re: Topband: Feeding 160M Vertical on 80M (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Tue, 7 Jan 2014 01:14:19 -0500
Hi, Bob End feeding that 160m 1/4 wave as an 80m 1/2 wave should work great! For several years I ran a vertical 40m 1/2 wave that I fed at the bottom through a 1/4 wave of 450 ohm ladder line. Perfec
/archives//html/Topband/2014-01/msg00048.html (10,084 bytes)

239. Re: Topband: Feeding 160M Vertical on 80M (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Tue, 7 Jan 2014 01:58:10 -0500
Well, sometimes, life is the art of the possible. At the time I was living in q small duplex on a corner lot and running a bunch of on-ground radials wasn't an option. Still I was working YBs and DUs
/archives//html/Topband/2014-01/msg00050.html (9,587 bytes)

240. Re: Topband: Feeding 160M Vertical on 80M (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Tue, 7 Jan 2014 09:47:27 -0500
Good point, Tom I guess I assumed that Bob had verified the 80m resonance. Charlie, K4OTV What is the top loading? Because something resonates on 160 m with something on the top doesn't mean it will
/archives//html/Topband/2014-01/msg00053.html (8,479 bytes)

Current List: 221 - 240
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