[Antennas] Hanging more wire.

[NA4FM (Buck)]

Are you able to add 45' of wire to one side of the feed line?  If so,
you will have approximately a 1/2 wave 80 meter off-center fed doublet
which should load on all bands from 3.5 - 30 MHz.  Also, remove as much
coax as possible between the ladder line and the rig.  If you need to
feed the ladder line into the house, say through a window, use two
pieces of coax (any type).  Connect the ladder line to the center
conductors and short the outside braids of the two coaxes together to
have a binocular looking piece for feeding the line into the house.
Then connect ladder line all the way to the rig if possible, or, as
previously suggested, no more than 6 inches.  Your antenna tuner should
do the matching for you.  If you use a balun, use a 4:1 rather than a
1:1. You should be just as well without the balun though as the tuner
will match the load for you in the rig.

If you need a space-saving antenna, check out the G5RV design.  I think
it is close to the same size as you are using but tunes 75/80 much
better than the one you have.

Good luck
Buck

> -----Original Message-----
> From: Dan Evans [mailto:n9rla@yahoo.com] 
> Sent: Tuesday, February 17, 2004 5:56 PM
> To: antennas
> Subject: [Antennas] Hanging more wire.
> 
> 
> To hang more wire, or less wire?
> 
> I have an 88' ladder line fed dipole, up in the trees about 
> 45'.  It works pretty well on 40 & 20, but doesn't tune well 
> on 75m, being a bit short. I'm using the internal tuner in my 
> '746, about 10' of rg213, 1:1 balun, and probably 60' of 
> 450ohm ladder line.
> 
> I would like to get better results on 75m, and still use it 
> on 40 & 20.  [I have a vertical that does a decent job on 10 
> & 15].  What I would like to do is extend the dipole into a 
> loop for 75m.  But, living on a 100'x60' lot, I just don't 
> quite have the real estate.  What I can do is make a loop 
> that is about 200' [at the same 45' average height], or I 
> could lengthen the current 88' dipole to 130' and give it a  
> "Z" shape.
> 
> I could also go with the 200' loop, and add a 'stub' of 
> ladder line to load it for 75m....
> 
> What do you think?  Hang more wire, or less wire?
> 
> Any suggestions greatly appreciated:-)
> 
> 73
> Dan
> 
> Dan Evans K9ZF
> Scottsburg, IN 47170
> {EM78}
> K9ZF /R no budget Rover
> ex-N9RLA
> Check out the Rover Resource Page at:
> http://www.qsl.net/n9rla
> QRP-l #1269
> Central States VHF Society
> IN-Ham list administrator
> 
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