[BC] franklin question (was WSM

[Bailey, Scott]

Are those still franklins still legal?

-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of Rob Atkinson
Sent: Friday, September 29, 2006 12:09 PM
To: broadcast at radiolists.net
Subject: Re: [BC] franklin question (was WSM

I guess one good thing about the Franklin is that there's no radials to
rip 
up and run off with.  I've always wondered how the Franklin is fed.  The
one 
in Calif. that's the two tower phased DA is fed with unbalanced open
wire 
feed.   At the feedpoints, is this feedline terminated so the center is 
bonded to one side and the outer wires to the other (as if the Franklin
is a 
1 w/l vertical center fed zepp) or are both sides of the feedpoint fed
with 
the center wire (like two 1/2 w. end fed zepps with one side of the
feed, 
the outside, unterminated)?

thanks,

rob atkinson
st. charles IL

maybe the copper thefts will result in a return to the days of manned tx

sites.


***************************************

I believe this has already been mentioned,  the WSM tower is NOT a  
Franklin,
it is slightly less than a 5/8 wavelength tower. Jack DeWitt designed
it
originally as a 5/8 wave radiator for maximum ground wave signal.  One
of 
the
anomolies of the 5/8 wave is the amount of radiated signal that  is
radiated 
at
a high angle.  This radiation can end up bouncing the signal  back into
the
primary ground wave coverage area.  He made measurements via  air after
the
installation and determined that he needed to shorten the towers
overall 
length
to reduce the high angle radiation signal.

The Franklin antennas are essentially a full wave antenna insulated and
fed
in the center of the tower. I have been in the tuning house of the WSM
tower
and  it is at the base of the tower not located in the middle.  Both WLW
and
WSM  are not Franklins.

Gary now that you are in Nashville, get together with Watt Hairston and
get
the tour of the site it is impressive and full of history.


Dave Hultsman
_______________________________________________

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