[Elecraft] Stealthy Antenna

Mon Jan 20 12:51:01 2003

Mike
Your question leaves us with new questions :-)

Is there a limit to how long you can make the dipole?
Will this be for a single band or do you plan to use it multiband?

If single band, the answer is easy.  Cut the dipole to resonance and
put the balun at the feedpoint.  Then run the coax all the way in to the
rig.
Note that in this case the balun should be a 1:1 balun, not a 4:1.

If you are going multiband, bring the balun as close to the shack as you can
to minimize the length of the coax.  You may have to juggle the length of
the dipole and the length of the twinline to find some average overall
length that can be matched readily.  Lengths such as used in the G5RV would
be a good place to start.  Here the balun may need to be 1:1 or 4:1,
depending
on the band and the impedance appearing at the balun end of the feedline.
If
you use banana plugs, it would be easy to swap baluns when going from a band
with low impedance at the balun to one with high impedance at the same
point.

Good luck and 73,
Bob N6WG

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Mike Walkington
Sent: Sunday, January 19, 2003 7:50 PM
To: Elecraft Reflector
Subject: [Elecraft] Stealthy Antenna

All,

I'm planning to use a short piece of co-axial cable (6-7 feet) to get from
my K2 (with KAT2) through the wall of the house to an externally mounted 4:1
current balun (the W1CG model).  From the balun I plan to run twin feed
(20-30 feet) to a doublet or loop mounted under the eaves of my two storey
house (to avoid the anti-antenna covenants).  I have some questions about my
proposed configuration that I'd appreciate some advice on:

1) Can anyone offer some experienced advice on how long or short the co-ax
can be?
2) Is it OK to mount the balun in a plastic box?
3) Would you recommend a doublet or a loop?

Mike
AC7MZ
K2 #2599

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