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221. Re: [TenTec] repairs (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Sun, 27 Nov 2005 23:34:46 -0500
Larry, Those are the classic symptoms of a parasitic oscillation. You probably already know this. But in any case, you need to look at suppression and low pass (HF) filters in the rest of the path to
/archives//html/TenTec/2005-11/msg00524.html (9,986 bytes)

222. Re: [TenTec] Comments on "Repairs" (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Mon, 28 Nov 2005 22:19:16 -0500
grounding is As you describe these various ground systems, it is clear that there are some very long wires connecting the various ground system components together. These long wires likely have sign
/archives//html/TenTec/2005-11/msg00558.html (12,132 bytes)

223. Re: [TenTec] Comments on "Repairs" (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Mon, 28 Nov 2005 22:51:46 -0500
poor Ok....8 feet....allow me a little slack and call it say 3 meters. A quarter wave on 12 meters. Almost a quarter wave at 15 meters. Thus probably not a very good ground at all on 10, 12 and 15 m
/archives//html/TenTec/2005-11/msg00564.html (10,070 bytes)

224. Re: [TenTec] Fw: Your semi-annual Astron tip... (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Tue, 29 Nov 2005 16:09:30 -0500
I remember seeing this before a couple of times, but thank you for reminding us all of it. I feel this reminder was most timely. I dare say other models of power supply might benefit from the same mo
/archives//html/TenTec/2005-11/msg00593.html (11,081 bytes)

225. Re: [TenTec] Station and AC Ground (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Tue, 29 Nov 2005 16:16:04 -0500
Well....yes and no. Yes, a circuit exists through your radio gear that ties the two grounds together. Depending on the equipment, it might even be a pretty good connection, although not at RF. But if
/archives//html/TenTec/2005-11/msg00594.html (10,176 bytes)

226. Re: [TenTec] Station and AC Ground (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Tue, 29 Nov 2005 16:28:38 -0500
Although I don't know if my system, or anyone's system could really take the full brunt of a direct strike (although I know several have claimed so), I do agree that even a few tenth's of an ohm of r
/archives//html/TenTec/2005-11/msg00595.html (11,933 bytes)

227. Re: [TenTec] Station and AC Ground (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Tue, 29 Nov 2005 16:37:44 -0500
Or....a half wave ground wire, to repeat the low impedance at earth right at the radio. And, since lightning is RF, I feel that a real RF ground is important, even for lightning. 73 de Gary, AA2IZ _
/archives//html/TenTec/2005-11/msg00596.html (8,571 bytes)

228. Re: [TenTec] Station and AC Ground (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Wed, 30 Nov 2005 17:32:13 -0500
Well.....If I had appreciable amounts of RF on the outside of my coax, which I don't due to the heavy chokes I use at the ends, then I can imagine a path for RF to flow from my power amplifier into t
/archives//html/TenTec/2005-11/msg00642.html (10,971 bytes)

229. Re: [TenTec] Fw: Your semi-annual Astron tip... (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Wed, 30 Nov 2005 17:37:55 -0500
Excellent point ! should something 24 connection _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2005-11/msg00643.html (9,872 bytes)

230. Re: [TenTec] Station and AC Ground (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Wed, 30 Nov 2005 17:56:58 -0500
See my other reply on this subject. No source, in my setup, for any appreciable current to flow on this ground path. No more than there normally is on anyone's ground path. Of course, as has been wri
/archives//html/TenTec/2005-11/msg00644.html (10,051 bytes)

231. Re: [TenTec] Station and AC Ground (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Wed, 30 Nov 2005 18:01:48 -0500
station the close But, as you also said, there should be no current in it. I don't advocate using the half wave ground in a vacuum, that is, without taking the other necessary steps also. You must ch
/archives//html/TenTec/2005-11/msg00645.html (9,645 bytes)

232. Re: [TenTec] Station and AC Ground (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Wed, 30 Nov 2005 22:05:53 -0500
Yes, I've had some bad RF burns in a past life. Ouch ! Slow to heal also. That's why I use such care never to allow RF to flow on the outside of my Coax. Takes a lot of work with chokes to accomplish
/archives//html/TenTec/2005-12/msg00002.html (7,639 bytes)

233. Re: [TenTec] Airpax circuit breaker (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Mon, 5 Dec 2005 22:52:52 -0500
Indeed yes, and maximum power is delivered when the load matches the source impedance. But, you all know this already. 73 de Gary, AA2IZ _______________________________________________ TenTec mailing
/archives//html/TenTec/2005-12/msg00115.html (8,492 bytes)

234. Re: [TenTec] Mode poll? (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Thu, 8 Dec 2005 15:08:25 -0500
Hmmm.....my breakdown would be about like this... CW - 0 (used to do it, not any more) SSB - up to 5 % (used to do it, not any more) Digital - all the rest. (love it, can't get enough !) 73 de Gary,
/archives//html/TenTec/2005-12/msg00164.html (9,036 bytes)

235. Re: [TenTec] Mode poll? (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Thu, 8 Dec 2005 15:10:35 -0500
Contest: 95 + % Everything else: almost 0 % Gary _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2005-12/msg00165.html (11,365 bytes)

236. Re: [TenTec] Overlooked? (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Thu, 8 Dec 2005 15:12:12 -0500
Worse thought still.... *IS* there even a dot ????? 73, Gary _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/ten
/archives//html/TenTec/2005-12/msg00166.html (7,961 bytes)

237. Re: [TenTec] Centurion (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Sat, 10 Dec 2005 21:52:49 -0500
I have two observations about all this, or perhaps I should call them questions. First of all, I thought a tube was supposed to be pumped down to a very good vacuum and then completely sealed. Thus t
/archives//html/TenTec/2005-12/msg00242.html (9,731 bytes)

238. Re: [TenTec] Centurion (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Sun, 11 Dec 2005 15:37:05 -0500
Well !! We certainly generated a very useful discussion on this topic ! Reading all the technical posts, and the links people provided, I certainly learned a lot. I now understand that the getter is
/archives//html/TenTec/2005-12/msg00264.html (11,926 bytes)

239. Re: [TenTec] Centurion (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Sun, 11 Dec 2005 22:06:48 -0500
Hmmmm.....and I was just getting around to thinking about building a "test" socket setup. Are you saying that filament heat alone was enough to melt the solder ? I would have thought that it would ta
/archives//html/TenTec/2005-12/msg00275.html (11,689 bytes)

240. Re: [TenTec] Centurion (score: 1)
Author: "Gary Hoffman" <ghoffman@spacetech.com>
Date: Tue, 13 Dec 2005 20:34:23 -0500
Excellent points. Can one obtain replacement gripper springs ? how use _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/li
/archives//html/TenTec/2005-12/msg00329.html (11,141 bytes)

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