[R-390] Internal Product Detector

[Roger Ruszkowski]

Fellows,

Out the 455 KHz on the back panel.
Through your surplus selective volt meter. 
Wire the volt meter output back into the diode load after you remove the jumper.
Get some levels adjusted and you would think you were listening to a rice box of its era.

The Collins Engineers knew these options were in the coming technology
and built the external back panel connectors into the original chassis frames.

Hang a diode on the 455Khz output and couple that back into the diode load. 
Begin improving on your detector circuit. You know what is going into the circuit.
You know what needs to come out of the circuit to drive the R390 audio circuits.

Make the solution general. A 455 Khz IF input and an audio line load level out put and a good 2 watt audio amp.

A couple good off the shelf options have been suggested in the other contributions to this thread.
It plugs in, it is reversible, no one goes insane when hearing another boat anchor has been so violated.

Enjoy,


Roger  still SC AI4NI and not yet hailing from 8 land.