[TowerTalk] Fwd: balanced line loss on a mismatched antenna

[HansLG at aol.com]

Maybe yo could look in to the HB9CV antenna instead. The dimensions should  
be about the same but with a lot better match. A fast search showed an 
antenna  with a 75 ohms input and I remember several hams in Sweden building 
that antenna  with a 50 ohms input impedance.
 
_http://www.google.com/imgres?imgurl=http://www.radiosparks.com/images_d/Hb9
cv.gif&imgrefurl=http://www.radiosparks.com/schematics.asp%3FUID%3DAntenna%2
6newwindow%3Dtrue&h=480&w=640&sz=8&tbnid=GhQRdr7FeeDNRM:&tbnh=90&tbnw=120&zo
om=1&docid=wOUiIrOPETZBfM&hl=en&sa=X&ei=8CdNT5uYHefX0QGgh-W9Ag&ved=0CDIQ9QEw
Aw&dur=92_ 
(http://www.google.com/imgres?imgurl=http://www.radiosparks.com/images_d/Hb9cv.gif&imgrefurl=http://www.radiosparks.com/schematics.asp?UID=An
tenna&newwindow=true&h=480&w=640&sz=8&tbnid=GhQRdr7FeeDNRM:&tbnh=90&tbnw=120
&zoom=1&docid=wOUiIrOPETZBfM&hl=en&sa=X&ei=8CdNT5uYHefX0QGgh-W9Ag&ved=0CDIQ9
QEwAw&dur=92) 
 
Hans - N2JFS/SM6BXX
 
 
  
____________________________________
 From: w9ac at arrl.net
To: towertalk at contesting.com
Sent: 2/28/2012 2:05:16  P.M. Eastern Standard Time
Subj: Re: [TowerTalk] balanced line loss on a  mismatched antenna


>"You'd be way better off with just a dipole (EZNEC says  22 - j600 ohms 
for a 44 foot element) and either..."

I agree with  Dave's loss numbers for 44 ft element length.   

However,  before giving up and using a shortened 44 ft. dipole, you may 
want to see if  there's a way get the elements lengthened close to a halfwave 
and still keep  spacing at 0.1 wavelength.   Perhaps bring the ends down if 
you're  maxed-out on horizontal space.  If you can, then you can use my prior 
 message as a guide for system loss.  I would still model it with the  
hanging ends.  Otherwise, the 44 ft length on 40m is going to be a real  looser 
with the 8KJ as the added element really drives the impedance down from  
mutual coupling and the short element length makes it too reactive to keep  
losses low, even when trying to match at the feedpoint.

Paul,  W9AC


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