DATONG, FL3, MULTI-MODE AUDIO FILTER
Datong FL-3 Multi-Mode Filter
This device is an external audio signal filter. It features both an automatic and manual notch filter, as well as adjustable low- and high-pass filters. It can be used on scanners, shortwave and ham receivers. There are three variable controls and five push buttons. to select the operating modes:
Auto notch on/off
SSB + Peak
SSB + NOTCH
This unit has a headphone jack in the front; a 3.5mm socket for the power connector (8 - 20V DC) and three phono sockets in the back - Input, Tape Output, and Speaker Out (2.5 Watts into 8 ohms).