[Hammarlund] BEST ANTENNA??

[Carl]

I use all coax fed antennas in the various vintage stations. After 
having similar results with the TV balun crap shoot I wound my own 9:1 
baluns on a FT82-43 toroid; they are near flat from 0.5 to 30 mHz.

If you are having problems with digital crud, a passive or active 
preselector with a Farrady shield on the input coils works well.

Carl
KM1H

----- Original Message ----- 
From: "Pat & Rich McKinney" <pmcknney at bellsouth.net>
To: <hammarlund at mailman.qth.net>
Sent: Sunday, January 04, 2009 7:52 AM
Subject: [Hammarlund] BEST ANTENNA??


DE WB4VFN Rich and I have been working on several boat anchors for 
friends.  I have on my bench now a sp400 and a 129x.  Looking for input 
on best antenna setup.  The book shows it wants a balanced input at 300 
ohms.  For my station I use a ladder line fed doublet and that seems to 
be what these old rigs like best.  But most people like to use coax 
these days.  The 129x even has a pl259 for the antenna input.  In 
playing around I found that the rigs...especially the sp400 don't like 
one side of the antenna coil grounded.  Seems like the signal comes up a 
little but the noise comes up a big lot.  I tried using a tv balun coax 
to twin lead to match it but insertion loss was too much.  Just 
wondering if anyone else has found best way to match in antenna input to 
coax.


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