[Towertalk] 1950 era Balun ?

[Jim Smith]

Sounds like the Heathkit B1, except it's in a box.

VE7FO


Jim Reid wrote:

>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
>
>
>
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