MFJ-1707B – Automatic RF Sense Antenna Switch


With power applied, the MFJ-1707 senses transmitted RF and switch the antenna from receive to transmit using a relay.

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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.

MFJ-1707B - Automatic RF Sense Antenna Switch


  • Power 12V DC
  • Weight: 200 g
  • Fitted with relay
  • RF sensed switch
  • Delay adjustment
  • 3 x SO239 sockets
  • LED power indicator
  • Size: 102 x 72 x 40 mm
  • Power rating 200W SSB PEP
  • 2 x Phono sockets Control & Aux
  • Power off defaults to transmit mode

Additional information

Weight 0.5 kg