Scientific Radio Systems
SR-610NDB

Also from SRS, there is an NDB, " Non-Directional Beacon"
transmitter system which consists of the
SRT-29 transmitter and the SR-610NDB antenna coupler.







The Military version is




It also has a transmitter only version of the SR-210 series.
Note: there is "NO" receiver board in this unit.





Note the Toroidal coil, in the RF output section.
This transmitter only unit covers the 500 KC. portion of the radio spectrum.





The transmitter ID plate.