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301. Re: [TowerTalk] Inverted L Tuning Question (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 05 Dec 2008 10:44:38 -0800
The coax shield should be going to the radial system. Earth is NOT a good return for antenna currents/fields. You don't want/need an EARTH connection. You DO need radials. The antenna is electrically
/archives//html/Topband/2008-12/msg00049.html (8,768 bytes)

302. Re: Topband: Conditions last night (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 07 Dec 2008 16:02:21 -0800
Same problem on most of the west coast -- we were listening for EU but never heard you guys all. No matter -- even if we had, it's pretty tough to get through the wall of much closer east coast stati
/archives//html/Topband/2008-12/msg00076.html (7,848 bytes)

303. Re: Topband: Receive Problem (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 07 Dec 2008 16:04:52 -0800
Do you mean that the resistor to earth is at the SSW end? If you do, you have it backwards, and EU is off the back of it. Unless, of course, it's a reversible. 73, Jim K9YC __________________________
/archives//html/Topband/2008-12/msg00077.html (7,360 bytes)

304. Re: Topband: Shunt Fed Question (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 07 Dec 2008 16:11:28 -0800
Don't tell K5RC (W7RN) that. His new 160 transmit antenna (about a year) is a quarter wave, and he is BIG on 160. When we were lined up trying to run JA this morning, one JA who was doing a lot of sp
/archives//html/Topband/2008-12/msg00078.html (7,745 bytes)

305. Re: Topband: 160m L impedance?? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 08 Dec 2008 17:11:58 -0800
Because you measured in the shack. The length of line between the shack and the load is an impedance transformer. Study the material in the ARRL Antenna Book on Smith charts. If you know the complex
/archives//html/Topband/2008-12/msg00100.html (7,805 bytes)

306. Re: Topband: Good tuner for 160 m (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 13 Dec 2008 12:34:28 -0800
Yes, these are good tuners, excellent value for the price. Downsides -- the fixed caps are a bit under-rated, and the dial cords are a PITA. The current 238B elimnates the dial cord, goes for close t
/archives//html/Topband/2008-12/msg00154.html (7,465 bytes)

307. Re: Topband: Polarisation coupling effects at MF?? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 13 Dec 2008 12:38:22 -0800
I'm convinced that the reason verticals play so much better on 160 than their vertical and horizontal patterns suggests is related to the way vertically and horizontally waves propagate on 160. 73, J
/archives//html/Topband/2008-12/msg00155.html (7,640 bytes)

308. Re: Topband: Searching for beverage info (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 21 Dec 2008 13:39:55 -0800
SW. I went to the reflector to look up 'short beverage' and came Short Beverages work, they're just not as directional. For that you need two wires running more or less in parallel, more complex term
/archives//html/Topband/2008-12/msg00191.html (8,736 bytes)

309. Re: Topband: comparison (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 24 Dec 2008 14:37:40 -0800
The biggest difference you can make is with radials. The shorter your antenna, the more important it is to have more radials. They don't need to be long, they don't need to be uniform, they just need
/archives//html/Topband/2008-12/msg00208.html (7,851 bytes)

310. Re: Topband: Microwave Tower on 160 meters (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 24 Dec 2008 21:26:22 -0800
For a few years, I had use of a mountaintop QTH with a 150 ft AT&T tower (32 ft square at the base, 24 ft square at the top). The ground sloped off by about 30 ft to the NE. I hung a loaded dipole fo
/archives//html/Topband/2008-12/msg00214.html (8,339 bytes)

311. Re: Topband: Matching Transformer (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 25 Dec 2008 20:20:20 -0800
a 9:1 BALUN vs a matching transformer. Since his looks completely thing. Bob, "Balun" is one of those soft squishy words that means many things to many people, and most people who use the word are mi
/archives//html/Topband/2008-12/msg00227.html (8,269 bytes)

312. Re: Topband: Matching Transformer (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 26 Dec 2008 16:49:10 -0800
That is NOT a good thing. Don't do that! You want no coupling to your transmit antenna. Disconnect it and drive a stake, even if it's not a good stake or a long stake. Yes, as George said, you defini
/archives//html/Topband/2008-12/msg00239.html (8,296 bytes)

313. Re: Topband: Matching Transformer (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 27 Dec 2008 14:14:32 -0800
Herb, No disagreement on radials at all -- my advice was with respect to using that radial as a termination for Bob's Beverage. 73, Jim K9YC _______________________________________________ Topband ma
/archives//html/Topband/2008-12/msg00246.html (8,426 bytes)

314. Re: Topband: (no subject) (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 27 Dec 2008 14:16:55 -0800
See N6LF's website about velocity factor and radials. Dunno about BOG. 73, Jim K9YC _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting
/archives//html/Topband/2008-12/msg00247.html (7,552 bytes)

315. Re: Topband: Matching Transformer (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 28 Dec 2008 13:19:44 -0800
Au contrair! See work by N6LF, which strongly suggests that there are resonance effects, especially with only a few radials. 73, Jim K9YC _______________________________________________ Topband maili
/archives//html/Topband/2008-12/msg00258.html (9,310 bytes)

316. Re: Topband: Stew Perry Rules? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 28 Dec 2008 13:27:04 -0800
That's right. If you use the cluster, you're a check log, not in competition. I used the cluster during the day for RAC, then disconnected it and cleared my screens before getting back to Stew Perry.
/archives//html/Topband/2008-12/msg00259.html (7,718 bytes)

317. Re: Topband: Matching Transformer (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 28 Dec 2008 20:37:33 -0800
Yes. That's what I said -- "especially with only a few radials." I'd bet that the vast majority of radial systems consist of 4-8 radials. Remember that most hams live on small lots. Yes, I have 60+ r
/archives//html/Topband/2008-12/msg00265.html (9,365 bytes)

318. Re: Topband: Matching Transformer (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 28 Dec 2008 23:00:25 -0800
Walk a mile in the other guy's shoes. A typical city lot is 25- 35 ft wide, and the house will run as close to the edges as building and zoning codes allow. There may be a small back yard. I had what
/archives//html/Topband/2008-12/msg00266.html (9,078 bytes)

319. Topband: City Lots (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 29 Dec 2008 12:44:59 -0800
I did say CITY LOT, not suburban lot. Chicago (including Evanston, Oak Park, etc.), New York City and older suburbs, San Francisco and older suburbs (Palo Alto, Oakland, Berkeley), Cincinnati, Baltim
/archives//html/Topband/2008-12/msg00271.html (8,253 bytes)

320. Re: Topband: City Lots (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 30 Dec 2008 09:20:55 -0800
alive In both cases, a direct result of limited antennas. Here near SF, we work a bunch of LAX, SB, and SDG, but not many of these guys have the antennas to make it to the east coast. or ND? ;o) No w
/archives//html/Topband/2008-12/msg00285.html (8,982 bytes)

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