[BC] franklin Two Antennas back at WOAI 1200 San Antonio

[DHultsman5@aol.com]

In a message dated 9/29/2006 12:11:25 PM Central Daylight Time,  
ranchorobbo at hotmail.com writes:

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



*************************************
 
 
The WOAI Franklin,  two locations back, was designed and implemented  by Mr. 
Jeffus, then CE of WOAI AM-TV.   It was written up in the IRE  Broadcast 
transactions,  I would like to have a copy of that paper.  I  had a copy of the 
transactions and have looked for it over the past 25 years and  must have loaned 
it out or misplaced it.
 
I visited the site over 30 years ago.  The Continental 317B  transmitter was 
installed next to the RCA Channel 4 TV transmitter as I recall  at the TV 
site.  The TV tower was next to the transmitter building.
 
The WOAI AM tower was nearly a half mile down the road from the TV and AM  
transmitter building.  At that time the AM signal was fed to the tower on  very 
tall open wire feed line.  At the base of the tower was a building  about the 
size of single car garage.  With termination gear.  A 3-1/8"  rigid 
transmission line was insulated from the base to the mid point of the  tower. At the mid 
mount on the tower was a concrete platform with a small  building about the 
size of a outhouse.  The 3-1/8 line was the coupled into  the top section of 
the tower.  About 1/2 way up the bottom section and 1/2  way up the top section 
a standard sample loop was mounted with feed lines to the  bottom of the tower.
 
John Furr later CE of WOAI moved the site and replicated the  Franklin.  As 
note the last move it was constructed as a standard series  fed tower. 
 
At night WOAI covered the state and over 25 years ago had a good signal in  
Birmingham at night.
 
Dave Hultsman
Continental Electronics
Birmingham, AL