MFJ-1708 switch box automatico tra RX e TX commutato da linea SEND

This small MFJ automatic TX/RX switch detects transmitted RF and switches the antenna from reception to transmission via a relay. Short circuit the receiver antenna input to ground to protect the receiver. It also provides an auxiliary contact that closes to ground during reception (open in transmission) for an "On-the-Air" signal or other use.
Uses RF sensing technology to switch the antenna or an input Allows your key/keyer or PTT line to switch. A timer circuit Adjustable DELAY delays the "detachment" of the relay. This prevents to the antenna to switch in RX between dots or pauses in CW or between syllable and words on SSB.
Works on all modes: CW, AM, SSB, FM and digital. Handles 200W SSB PEP. Compact 4W x 2 5/8H x 1 1/2D inches.
It has of SO-239 coaxial connectors for antenna, transmitter and receiver. It has entrance control, closing of the auxiliary grounded contact, timing adjustment, power socket. Requires 12 VDC.