Is that anything like this?
LOL! No, not quite. The Turboencabulator is only needed if the groundpoise cannot sync-up correctly with the magnatic declination of that particular location.
The Turboencabulator takes the ouput from the goniometer amplifies it so that:
Ap = 10 log10(Ps/Pd)
and then attenuates it so that the R-390 can correctly interpret the analog-digital-analog loopback circuitry.
It’s a pain in the ass when you’re being fired at.