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

  • 1 Post By Yurii Pylypenko
LinkBack Thread Tools Search this Thread Display Modes

post #1 of 3 (permalink) Old 2018-04-19, 08:38 PM Thread Starter
Join Date: Jan 2009
Posts: 452
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.
wildwillie is offline  
Sponsored Links
post #2 of 3 (permalink) Old 2018-04-20, 04:08 PM
Join Date: Nov 2008
Location: San Diego, CA
Posts: 3,191
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
holl_ands is offline  
post #3 of 3 (permalink) Old 2018-04-28, 04:46 PM
Join Date: May 2017
Posts: 195
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

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.
6) Rescaling 9-Dir Uda-Yagi, 9...14 dBi. Tolerant to build and incl. metal boom
7) Extreme long 24-Dir Uda-Yagi (100"), excellent SWR <1.5, G=10...17 dBi
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.
wildwillie likes this.
Yurii Pylypenko is online now  

Quick Reply

Register Now

In order to be able to post messages on the Canadian TV, Computing and Home Theatre Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome