How to Change Frequencies on an R21 Receiver

An invisible fence dog collar requires an R21 receiver. This receiver transmits a signal from the electronic barrier, which engages the preventive capabilities (a vibration or shock) from the training collar and, in turn, helps keep a dog wearing the collar within a set area. Learn how to change the frequency of the R21 to prevent it from intercepting other messages or interfering with other collars.

Things You'll Need

  • Screwdriver
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Instructions

    • 1

      Remove the single fastener screw found in the bottom (between the two prongs) of the encasement using a screwdriver.

    • 2

      Pull the front of the encasement (the labeled side) off the pronged portion of the receiver. Look for a black switch (located on the bottom edge of the circuit board) with "10K" and "7K" printed to the left of it.

    • 3

      Slide the black switch vertically to change the receiver's frequency between 7K and 10K. (These numbers refer to the frequency band of the radio signal.)