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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