[Boatanchors] Link coupled output?

[StephenTetorka at cs.com]

Hi all:

I am trying to determine what characteristic impedance transmission line to 
use with my homebrew 1948 transmitter.

The unit uses two 1625's in the RF deck with a B&W type JVL link coil for the 
output to the antenna terminals.

In this arrangement, the B+ goes into the center tap of the coil with one 
section of a two gang variable across each half of the coil from center tap.

The antenna terminal output comes from a separate 3 turn coil located in the 
middle of the coil between the two halves..thus obtaining the RF coupling.

This arrangement is typlical of 1940's - 1950's rigs.

Would appreciate any assistance in this matter.
Regards,
Steve
WA2TAK