DF-A0157 High-Speed DF Antenna Band Switch

Product Code DF-A0157 Category


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The DF-A0157 is a high-speed, 4-band switch intended for direction finding applications. It accepts four frequency bands, each
with five antenna elements, and outputs the elements of any one band to the corresponding five RF outputs. The switch is controlled
via an RS-485 serial interface to allow remote control over a distance of up to 500m. All switching is solid state for rapid and
unlimited switching cycles.

The DF-A0157 includes an internal noise source as well as an external input for chain calibration purposes. Either the internal
noise source or the external calibration input may be selected to simultaneously inject a balanced signal in place of the antenna
inputs and thereby correct errors caused by variations in the system’s RF path.

DF switch

  • 4-band switch
  • External injection mode for chain calibration
  • Internal chain calibration noise source, selectable with either inline amplifier or with the amplifier bypassed.
  • Low noise amplifier on each channel with passive bypass capability
  • High-speed solid state switching


  • Single-channel amplifier
  • Low noise pre-amplifier on input
  • DC-injection to power upper stages

Advanced input stages:

  • ESD protection

Advanced output stages:

  • Output amplifiers for long cables
  • Cable slope correction on amplifiers
  • ESD protection


  • DF band switching and monitoring channel amplification for our range of DF antennas, particularly DF-A0062 and DF-A0095 (5-element DF interferometers)
  • For outdoor applications, DF-A0157 should be ordered in conjunction with DF-A0057-03 (outdoor housing for DF switches)
1. Start Frequency (MHz) 20
1. End Frequency (MHz) 6000
Active / Passive Passive

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