To the Picture Gallery
are Emergency Locator Transmitter (ELT), or "radio beacon"
Here you see five different versions of AN/URT-33. The device normally is activated at bailout and sends a signal for quick location of the pilot.
AN/URT-33 is used for locating the pilot, the pilot talks to the rescue team by help of his SAR radio.
There are two disadvantages:
The picture gallery shows the development up to integrated circuits.
The year of issue is not known to me, the (*) refers to labels "replace battery".
The aging ELT or radio beacon are replaced by:
(121.5; 243; 406 MHz).
The aging SAR- radios (like PRC-90) are replaced by: