[ARC5] SCR-274N transmitter mod.

[telegrapher at att.net]

I have unearthed a Lockheed Aircraft Service modification for the SCR-274N transmitters.  What it does is remove a couple of components an convert the calibration oscillator to a fixed frequency single crystal stage.  Says that 3105 Kc was to be installed in BC-696A and 6210 kc in the BC-458A.  This document which is the engineering drawing, heavy paper light tan in color (?) is dated March 24, 1947.  It has an official drawing number of SPD-701485 attached to it.  Probably looking for a new home with an official document caretaker.

Larry
W0OGH