4nec2 what you modelling - Canadian TV, Computing and Home Theatre Forums

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post #1 of 3 (permalink) Old 2018-04-19, 08:38 PM Thread Starter
 
Join Date: Jan 2009
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Post 4nec2 what you modelling

Well guys and girls what are you modelling in 4nec2
Can we get a look at your work ?

Or you got an idea and a drawing with measurements,
Some of us would like to model your ideas.
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post #2 of 3 (permalink) Old 2018-04-20, 04:08 PM
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Location: San Diego, CA
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Also looking for MEASUREMENTS (with photos incl. a RULER) for commercial Antennas that have NOT already been modeled (e.g HDTVPrimer & see my link at bottom of this post....

Antenna Simulations, Overload Calculations, etc: http://imageevent.com/holl_ands
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post #3 of 3 (permalink) Old 2018-04-28, 04:46 PM
 
Join Date: May 2017
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Quote:
Can we get a look at your work ?
Different kinds of shunting BiQuad

1) 300 Ohm version: https://ypylypenko.livejournal.com/27307.html
2) 200 Ohm version: https://ic.pics.livejournal.com/ypyl...0_original.jpg
3) 75 Ohm large high-gain version https://ypylypenko.livejournal.com/20957.html
4) 150 Ohm version: https://ypylypenko.livejournal.com/12689.html
not practical as standalone, but convenient to build 2x stack array

Uda-Yagi:
5) Rescaling 5-Dir Uda-Yagi, with SWR<1.5, G=8...12 dBi, tolerant to build (unlike all Uda-Yagi in holl_ands album with extreme high Q, extreme tight build/material tolerances and non-compliant with metallic boom - whatever BoomCorr factor you apply - it's not wideband due to extreme-high-Q nature of design). Easy to build with zinc-plate or alu stripes.
https://ypylypenko.livejournal.com/17173.html
6) Rescaling 9-Dir Uda-Yagi, 9...14 dBi. Tolerant to build and incl. metal boom
https://ypylypenko.livejournal.com/15582.html
7) Extreme long 24-Dir Uda-Yagi (100"), excellent SWR <1.5, G=10...17 dBi
https://ypylypenko.livejournal.com/10000.html
8) working on 2x stack version of patch antenna
9) develop low-loss 4:1 (and possibly other ratios) PCB balun.
Currently optimized topology of Guanella transformator (total insertion loss using cheap single-side FR4 epoxy is <0.2 dB)
Investigating how to add bal-un (1:1 part), since standalone Guanella provide poor simmetrization (+0.75V, -0.25V arms) - hence coax outer shield currents/losses.
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