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341. Re: [TowerTalk] one way coupler (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Fri, 30 Jan 2004 07:01:55 -0800
Very interesting (since this is something I'm also working on doing).. The short answer is that there isn't a "simple circuit" that will do what you want. In the microwave world, there are nifty thin
/archives//html/Towertalk/2004-01/msg00505.html (9,308 bytes)

342. RE: [TowerTalk] one way coupler (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Fri, 30 Jan 2004 10:24:59 -0800
At 10:28 AM 1/30/2004 -0500, Kevin Adam wrote: Yes Comtek Phase Box will do just what u want it to do www.comteksystems.com just proud owner of two for 160m 80m I'd kind of want to see some analysis
/archives//html/Towertalk/2004-01/msg00511.html (9,762 bytes)

343. Re: [TowerTalk] P-P voltage on an antenna (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Tue, 03 Feb 2004 10:28:23 -0800
At 10:57 AM 2/3/2004 -0500, Eric Scace K3NA wrote: W1MK and I wonder if anyone can point us to an authoritative reference for an answer to these two questions: 1. An antenna model predicts a current
/archives//html/Towertalk/2004-02/msg00051.html (10,068 bytes)

344. Re: [TowerTalk] Combining antennas (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Tue, 03 Feb 2004 10:51:49 -0800
At 10:07 AM 2/3/2004 -0500, Pete Smith wrote: I have a spare Stackmatch box, repaired after a lightning hit, and I'm thinking about using it to let me simultaneously or alternatively feed my 40m yagi
/archives//html/Towertalk/2004-02/msg00052.html (10,864 bytes)

345. Re: [TowerTalk] Combining antennas (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Tue, 03 Feb 2004 12:16:55 -0800
At 02:02 PM 2/3/2004 -0500, Pete Smith wrote: At 10:51 AM 2/3/04 -0800, Jim Lux wrote: ... So, the SNR will be 0.5Sa/.707(Na+Nb). If Na=Nb, this is .5/1.414 or about 4.5 dB worse than it was before.
/archives//html/Towertalk/2004-02/msg00058.html (9,896 bytes)

346. Re: [TowerTalk] Certification to climb towers? (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Fri, 06 Feb 2004 15:16:00 -0800
At 03:03 PM 2/6/2004 -0700, John Lloyd wrote: I went to a club meeting last night where the speaker was in the business of Tower and Antenna Installation. He said that the OSHA rules have changed ove
/archives//html/Towertalk/2004-02/msg00144.html (13,696 bytes)

347. Re: [TowerTalk] Certification to climb towers? (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Sat, 7 Feb 2004 06:49:28 -0800
Good question.. It would probably depend... Does Fred do this for a living? (then Fred, OSHA, and his insurance company will have worked out all the details) Is this Fred doing you a personal favor a
/archives//html/Towertalk/2004-02/msg00162.html (10,023 bytes)

348. Re: [TowerTalk] Tuners (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Sat, 14 Feb 2004 07:43:53 -0800
matcher As Jerry says, there's no fooling going on. The tuner is an impedance matching device. If the antenna is non-reactive (aka resonant), and the impedance isn't 50ohms, the tuner transforms what
/archives//html/Towertalk/2004-02/msg00218.html (9,309 bytes)

349. Re: [TowerTalk] Grounding Rod Lenght (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Sun, 15 Feb 2004 10:30:06 -0800
You won't find the NEC online; it's copyrighted, and the publisher, NFPA, which goes to some expense to create the code, would prefer to be paid for their labors. If you're in a business subject to "
/archives//html/Towertalk/2004-02/msg00246.html (11,043 bytes)

350. Re: [TowerTalk] Grounding Rod Lenght (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Sun, 15 Feb 2004 13:54:11 -0800
Having just looked it up at http://www.nfpa.org/ The latest code is the 2002, with the 2005 due to be issued in Sept 2004. Be aware that many jurisidications adopt some other version as the "official
/archives//html/Towertalk/2004-02/msg00257.html (11,243 bytes)

351. Re: NEC and the web Was: [TowerTalk] Grounding Rod Lenght (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Mon, 16 Feb 2004 08:18:14 -0800
There was some court cases in TX about this a few years back, where someone had put up the entire code and NFPA sued. I don't recall the end result. This is a growing and pervasive problem. the Unifo
/archives//html/Towertalk/2004-02/msg00267.html (10,500 bytes)

352. Re: [TowerTalk] Grounding Rod Lenght (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Mon, 16 Feb 2004 20:10:54 -0800
I would think so.... They don't have to help you find stuff, but they should certainly have a copy of the code available for inspection (and probably for copying to take away at a "nominal" cost (clo
/archives//html/Towertalk/2004-02/msg00284.html (10,701 bytes)

353. Re: [TowerTalk] Grounding Rod Lenght (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Tue, 17 Feb 2004 05:58:26 -0800
Get the LV grounding guide from the Mike Holt web site.. it covers all this stuff in detail. Clamping lightning grounds is a no-no... exothermic bonding (welding with thermite (as covered in detail o
/archives//html/Towertalk/2004-02/msg00291.html (10,987 bytes)

354. Re: [TowerTalk] HELP Coax Phase Line Shield Switching (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Tue, 17 Feb 2004 06:01:53 -0800
for Exactly... you need to be able to switch both shield and center conductor. compared to a fixed direction system with no pattern direction switching. Can't see why there would be degradation in pe
/archives//html/Towertalk/2004-02/msg00292.html (9,023 bytes)

355. Re: [TowerTalk] Grounding Rod Lenght (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Tue, 17 Feb 2004 09:33:59 -0800
Steve's right.. "...exothermic welding, listed lug, listed pressure connector, or by listed clamp." Must be bonded to any of: - Building or structure grounding electrode system (that would be the UFE
/archives//html/Towertalk/2004-02/msg00297.html (11,353 bytes)

356. Re: [TowerTalk] Grounding Rod Lenght (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Wed, 18 Feb 2004 11:13:19 -0800
At 03:58 PM 2/17/2004 -0800, Wilson Lui wrote: National Electric Code (NEC) requires 8ft. Of soil coverage for ground rods. Meaning min legnth of 8ft of ground rod. But, the rod can be laid sideways
/archives//html/Towertalk/2004-02/msg00340.html (9,446 bytes)

357. Re: FW: RE: [TowerTalk] SteppIR VS Force 12 (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Thu, 19 Feb 2004 16:23:02 -0800
At 11:16 AM 2/19/2004 -0800, N6KJ wrote: Yes, one could imagine this, but I would propose something that I believe would be even better (and would serve other useful purposes). I would propose that t
/archives//html/Towertalk/2004-02/msg00393.html (11,329 bytes)

358. Re: [TowerTalk] Steppir tuning noise (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Fri, 20 Feb 2004 06:00:46 -0800
I they Pulses with fast edges and ringing. Could easily have noticeable spectrum up into HF, especially since it's fairly high power, and it's coupled pretty well to the feed line (capacitance from w
/archives//html/Towertalk/2004-02/msg00407.html (10,199 bytes)

359. Re: [TowerTalk] Steppir tuning noise (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Fri, 20 Feb 2004 18:49:40 -0800
pretty system. It's just one of those design decisions, I suspect.. Spend years working out all the last little foibles, or get the product on the market where it accomplishes 99.99% of the ideal and
/archives//html/Towertalk/2004-02/msg00414.html (11,006 bytes)

360. Re: [TowerTalk] Steppir tuning noise (score: 1)
Author: "Jim Lux" <jimlux@earthlink.net>
Date: Sun, 22 Feb 2004 13:42:51 -0800
probably fancy time to involved. Dog That dog food can and shielded wire is just fine for a one-off solution to a particular installation. How many hours did you spend finding the right size can, cut
/archives//html/Towertalk/2004-02/msg00437.html (13,524 bytes)


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