MFJ-1708B – Transmit/Receive RF Sensing Switch, HF/VHF, SO239


MFJ RF Sense Transmit/Receive Switch switches your antenna from receiver to transmitter using a relay.


Shorts your receiver to the ground during transmission. Use RF sensing with adjustable delay or PTT line. Has selectable open/short mute.

Features and Specifications:

  • Good SWR characteristics up to 450 MHz
  • Adjustable receive delay 50 ms to 4 seconds
  • Good isolation between transmit and receive ports
  • Control Line input for radios that have a key line output
  • Power off bypass setting the transmitter to the antenna
  • Receiver protection circuit to limit any transmit RF spikes
  • A Mute output that can be set to the ground to mute or open to mute
  • RF Sensing for radios that do not have a keying output when transmitting

Additional information

Weight 0.5 kg