View Single Post
  #46   Report Post  
Old April 20th 08, 01:17 PM posted to rec.radio.amateur.antenna
JN JN is offline
external usenet poster
 
First recorded activity by RadioBanter: Mar 2008
Posts: 21
Default Linear decoupling traps


"Roy Lewallen" wrote in message
news:P9adnbUbhbmPtZTVnZ2dnUVZ_smnnZ2d@easystreeton line...
JN wrote:

Roy,

One question:
Down the list is my posting FINAL PLAN.
Is it possible with EZNEC to simulate it?
It is made of transmission line (partly)

Yes or No is enough.
I have the DEMO version.

73 Jouko OH5RM


Yes, a simulation should be reasonably accurate. The segmentation
limitation of the demo version will probably reduce the accuracy some, but
you'll be able to get a very good idea of how it will work.

Roy Lewallen, W7EL


Yes indeed, the simulation verified that my FINAL PLAN is working OK
Two very clean resonances at 3.6MHz and 10.1MHz SWR abt 1.3 on both bands
Antenna length only 26m instead of normal 41m for 80m dipole.
For the stub section I used 0.003m=3mm spacing and 1.5mm insulation on 1mm
wire DielC 2.6.

Is there any possibility in EZNEC to calculate how long is quarter WL on
10.1MHz
with these stub variables?

By using transmmission line objects it could have been possible to use the
VF of line 0.73.

I did run out of segments to simulate tri-band version with additional
parallel dipole.

All simulation was made in free space and probably needs some minor tuning
in real life.

73 Jouko OH5RM