[Boatanchors] 1930s BC antenna?

[Al Klase]

Hi Jim,

There were a number of all-wave antennas developed in the 1930's to 
support the all-wave receivers being marketed at that time.  Many were 
broadband dopoles for short wave fed by twisted pair feed line.  There 
was usually a network at the receiver end that connected differentially 
to the feed line above, say 5 MHz, and in effect shorted the two side of 
the line together and worked it against ground as a "T" antenna for 
lower frequencies.  This was done automatically with a "cross-over network."

See the Frank C. Jones Antenna Book, starting on page 52: 
http://www.tubebooks.org/Books/Jonesant.pdf

I reverse engineered the GE V-Doublet back in the '90's, and like the 
way it worked.

Regards,
Al



On 11/12/2013 12:11 PM, Jim Haynes wrote:
>
> I remember my grandparents had a BC-SW radio dating from the 1930s,
> six-pin tubes like 76 and 78.  They had an outdoor wire antenna with
> a transformer in it that used a shielded twisted pair feedline to the
> radio.  What I don't remember is whether the transformer was in the
> middle, making it a too-short dipole, or whether the transformer was
> off the center.  Does anyone on the list know about this sort of thing?
>
> Jim W6JVE
>
> As a matter of unrelated trivia, they had a problem with interference
> from a state police radio transmitter operating about 1700 KHz. This
> was solved by adding a wave trap.
>
> jhhaynes at earthlink dot net
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/