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
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
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
"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
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
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
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
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
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
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
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
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
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
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
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
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
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.
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
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
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