What is the other unit? You may be able to buy a switch to allow you to use one unit at a time, but not both at the same time.
If you mount the transducers beside each other they will interfere if they are on the same frequency. You can use the 83kHz on one unit and then 200kHz on the other and interference should be minimal if you get any at all when set up like this.
-Lawren
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