Electrocom model 402 dl frequency shift converter

Electrocom model 402 dl frequency shift converter

The Electrocom 402 DL Terminal Unit. Solid state except to the CRT tuning display, this TU features adjustable mark and space frequencies via the thumb wheel switches. Has a loop output (naturally), autostart, and copy on mark. Also has a switch position for SEND, and an unoccupied slot for a pcboard for that purpose.