[Towertalk] 1950 era Balun ?

[Jim Reid]

Anyone recall the name/mfg of the open wire coil
balun we were using in the '50s.  It was on a small
plate,  maybe 3" x  5" or so;  had two open wire,  air
core coils,  maybe 4" long each.  Output from the Pi
network,  or single end final you had went to one coil pair
end of the plate.  Folks mostly were using 300 ohm
twin lead to Amphenol or other,  folded dipole antennas.
The balun provided the link between the single ended
transmitter output and the twin lead fed dipole.

Earlier,  the final output was usually a "swinging" link
coil, and the ladder line was connected to terminals to the
two ends of the link coil.  The two swinging link coil ends
served as balanced output terminals and the "antenna 
tuner/matcher"  of those days.  However,  TVI problems
pretty much killed-off  these sorts of set ups!

Couldn't recall the names about the balun,  so thought
I would ask.

73,  Jim  KH7M