Are the WMS 60/80 and WMS 61/81 components interchangeable?

Basically, you can use WMS 61 or WMS 81 handheld or bodypack transmitters with a WMS 60 or WMS 80 receiver, respectively.
You can not, however, use a WMS 60 or WMS 80 transmitter with a WMS 61 or WMS 81 receiver because these receivers will not function unless they receive a pilot tone from the
transmitter.

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