The MFJ-1708, automatic RF Sense T/R Switch
senses transmitted RF and switches your antenna from receive to transmit using a relay. Shorts your antenna input to ground to protect your receiver.
Provides an auxiliary contact closure to ground during receive for muting speaker. Instead of using RF sense to switch the Antenna, a control line input lets yourr PTT line switch the Antenna. Adjustable time delay circuit gives you delayed switching. All modes 200 Watts SSB PEP.
Dimensions and weight are including packaging