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References: [ +from:jim@luxfamily.com: 224 ]

Total 224 documents matching your query.

1. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 22 Dec 2020 08:06:19 -0800
1. Is the impedance at resonance at each feed point same for all the verticals and close to 40 Ohms? Most 4-squares have significant interaction among the elements, so you need some way to take the o
/archives//html/Towertalk/2020-12/msg00082.html (11,480 bytes)

2. [TowerTalk] 4 square - collins hybrid measurements/component values (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Sat, 26 Dec 2020 11:36:58 -0800
I'm putting together some models and I was wondering if someone has actual measured 4 port data for the LC Collins hybrid. I've got some sample capacitance and inductance values (e.g. for 80m, 436 pF
/archives//html/Towertalk/2020-12/msg00134.html (7,139 bytes)

3. Re: [TowerTalk] 4 square - collins hybrid measurements/component values (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Sat, 26 Dec 2020 18:35:21 -0800
regards, Dave N3AC I have the 3rd edition which doesn't have the models. But what I'm really looking for is measured data on a real box (with all the parasitics). I'm putting together some models and
/archives//html/Towertalk/2020-12/msg00146.html (9,275 bytes)

4. Re: [TowerTalk] 4 square - collins hybrid measurements/component values (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Sat, 26 Dec 2020 21:50:12 -0800
"All the parasitics"??? 73 Tim K3LR most practical implementations of the hybrid will have: 1) leakage inductance in the transformer (i.e. coupling factor isn't 1) 2) loss in the inductor (from R in
/archives//html/Towertalk/2020-12/msg00149.html (10,920 bytes)

5. Re: [TowerTalk] ALIGNING ANTENNA (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Fri, 1 Jan 2021 10:45:23 -0800
with a big strap wrench, or some rope and a piece of pipe. wrap the rope around the pole a bunch of times, then tie it off to the end of the pipe, and lean on the pipe.  You'll only get tiny moves (s
/archives//html/Towertalk/2021-01/msg00011.html (9,037 bytes)

6. Re: [TowerTalk] Weird RFI at remote location (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Fri, 1 Jan 2021 18:07:45 -0800
I bought 26 ac of land with an old house for a remote station. The power company buried the last 300 ft of power line. Now, the location has 100ft tower with 40-10 beam, 4 sq on 80, with the tower is
/archives//html/Towertalk/2021-01/msg00038.html (9,126 bytes)

7. Re: [TowerTalk] Weird RFI at remote location (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Fri, 1 Jan 2021 20:17:56 -0800
On 1/1/21 7:03 PM, Jim Brown wrote: On 1/1/2021 6:07 PM, Lux, Jim wrote: You might get one of those $50 spectrum analyzers - seeing the RFI spectrum may give you some clues  - a loop antenna (untuned
/archives//html/Towertalk/2021-01/msg00044.html (8,389 bytes)

8. Re: [TowerTalk] Modeling the OH1TV "Opposite Voltage" Feed System for Phased Arrays (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Mon, 4 Jan 2021 08:15:56 -0800
On 1/4/21 7:49 AM, Richard (Rick) Karlquist wrote: I never heard of this scheme, but many years ago modeled and/or built numerous 2 element driven arrays that were similar to this, except that I didn
/archives//html/Towertalk/2021-01/msg00059.html (9,421 bytes)

9. [TowerTalk] Need a test run on various versions of NEC (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 12 Jan 2021 10:34:59 -0800
I'm writing some software to generate/parse NEC input and output files. Generically for the purposes of optimizing phased arrays. I've been testing it here with NEC4.2, but my NEC2 seems to be broken
/archives//html/Towertalk/2021-01/msg00066.html (8,394 bytes)

10. Re: [TowerTalk] Need a test run on various versions of NEC (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 12 Jan 2021 13:43:28 -0800
What you meant "NEC broken" ? Can´t you just download it again? I used to use CocoaNEC (http://www.w7ay.net/site/Applications/cocoaNEC/)  and separately, a compiled version of NEC2, both broke when I
/archives//html/Towertalk/2021-01/msg00069.html (12,803 bytes)

11. Re: [TowerTalk] Ham-IV rotator brake noise (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 19 Jan 2021 16:29:15 -0800
Replying , but my initial answer is only a semi-serious one. (followed by one MAYBE (untested) suggestion) None of your neighbours have noticed as nobody goes outside anymore ! ! Exactly  - if you'r
/archives//html/Towertalk/2021-01/msg00080.html (9,770 bytes)

12. Re: [TowerTalk] Tower guy line Anchor Positions (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Sat, 23 Jan 2021 10:37:39 -0800
The total tension in each guy varies according to its angle with the tower in order to make the horizontal tensions the same.  If they (horizontal) are then a tower should be plumb or something else
/archives//html/Towertalk/2021-01/msg00113.html (11,228 bytes)

13. Re: [TowerTalk] Birds and towers (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Sun, 24 Jan 2021 11:56:24 -0800
On 1/24/21 11:13 AM, Andre VanWyk via TowerTalk wrote: I just completed installing two large Luso towers for a client and about to start construction on mine so will have the same issue. The problem
/archives//html/Towertalk/2021-01/msg00124.html (8,756 bytes)

14. Re: [TowerTalk] Measuring RF ground characteristics (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Sat, 13 Feb 2021 10:03:36 -0800
On 2/13/21 9:59 AM, Artek Manuals wrote: In the process of trying to correlate actual measured R+jX values vs NEC models for an 80M inverted L with elevated radials, I was directed to a paper by Rudy
/archives//html/Towertalk/2021-02/msg00031.html (8,740 bytes)

15. Re: [TowerTalk] Measuring RF ground characteristics (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Sat, 13 Feb 2021 12:22:37 -0800
Gerry Burke, of LLL/NEC fame had some discouraging news about their ground measurements.  He told me that in some cases there was no configuration of NEC parameters that would correlate with some rea
/archives//html/Towertalk/2021-02/msg00034.html (9,269 bytes)

16. Re: [TowerTalk] PL-259 RF Coaxical Connectors (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 16 Feb 2021 14:53:03 -0800
On 2/16/21 2:05 PM, Rob Atkinson wrote: I do not use solderless crimp on PL-259 connectors. PL-259 connectors were designed to be soldered! Starting a few years ago I experienced an intermittent and
/archives//html/Towertalk/2021-02/msg00078.html (10,005 bytes)

17. Re: [TowerTalk] Wire Antenna Supports (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 16 Feb 2021 16:54:51 -0800
I've noted there are at least a couple of telescoping masts (up to 50 feet) that could be used to support simple wire antennas (when guyed appropriately). One is carbon fiber, the other is aluminum.
/archives//html/Towertalk/2021-02/msg00083.html (8,511 bytes)

18. Re: [TowerTalk] Wire Antenna Supports (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 16 Feb 2021 17:14:23 -0800
It appears that Mike is in North Texas, where lightning is a factor (unlike here in Silicon Valley). Would well-grounded metal supports be a better option to fend off that problem? My question isnt j
/archives//html/Towertalk/2021-02/msg00085.html (12,306 bytes)

19. Re: [TowerTalk] Wire Antenna Supports (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 16 Feb 2021 17:16:36 -0800
It appears that Mike is in North Texas, where lightning is a factor (unlike here in Silicon Valley). Would well-grounded metal supports be a better option to fend off that problem? My question isnt j
/archives//html/Towertalk/2021-02/msg00086.html (8,597 bytes)

20. Re: [TowerTalk] Cable Work (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Fri, 26 Feb 2021 13:57:14 -0800
On 2/26/21 12:58 PM, Wayne Kline wrote: WL. I also have used the alunimum double barrel press sleeves from Tractor Supply. I have used them for Boom Supports and end post corner supports.. I have has
/archives//html/Towertalk/2021-02/msg00131.html (7,523 bytes)


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