MFJ-1708SDR automatic switch box between RX and TX switched by SEND line

MFJ-1708 automatic switch box between RX and TX switched by SEND line

This small MFJ automatic TX/RX switch detects transmitted RF and switches the antenna from reception to transmission via a relay. Short circuit the input of the receiver antenna to the ground to protect the receiver. It also provides an auxiliary contact that closes to ground during reception (open during 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. An adjustable DELAY timer circuit delays the "trip" 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. He manages 200W SSB PEP. Compact 4W x 2 5/8H x 1 1/2D inches.
It has connectors SO-239 coaxial cables for antenna, transmitter and receiver. It has control input, closing of the auxiliary contact to ground, timing adjustment, socket of power supply. Requires 12 VDC.