[R-390] R392 You own history.

[Roger Ruszkowski]

Fellows,

We must remember that the R39- were never designed or built for
humans to listen to. Humans do listen to these receivers a lot.

In their day of leading edge technology the receivers were just a stage in a radio teletype communication link.
The preferred method of data buffering was punch tape.

A receiver and a transmitter that could place a com link into operation at the push of some military grade buttons
as radio propagation changed and limited resources were reconfigured hourly to establish command and control for the 
leading military force on the planet, was state of the science. By the 1950's we had come a long ways since Germany managed 
it military command and control with a phone line and just two (I repeat two) of them Deforest tube things. (Later referred to as vacuum tubes).
Good technology but insufficient quantities were available.

The R390's were RTTY mainstay communication link receivers.
You only listened to it long enough to get the RTTY running clean paper.

Spooks took up bad habits of doing ditty copy with them which was OK.

Using these receivers on AM, just take it off the IF output or diode load and get your self some good 
audio equipment.

Meanwhile Enjoy the history you own.

Merry Christmas and Happy New Year to All as Change continues in America.

Respectfully,

Roger Ruszkowski  AI4NI  33C4H 68-75 Ft Devens, Phu Bia Viet Nam, Korea, Okinawa now also an old timer.