Transmit Receive RF Switch
RF sensed switch - Fitted with relay - Delay adjustment - Power rating 200W SSB PEP - 3x SO-239 sockets - 2x Phono sockets Control & Aux - LED power indicator - Power off defaults to transmit mode - Power 12V DC - Size 102 x 72 x 40mm - Weight 200g
With power applied, the MFJ-1707 senses transmitted RF and switches the antenna from receive to transmit using a relay. The antenna socket to the receiver is then grounded which protects the receiver. There is a delay circuit adjustment which gives you delayed switching. It also has a control line input, which allows switching from an external key, keyer or foot switch.