I just received the following email in response to a query about the CFRX
transmitter on 6070:

We are working on a replacement from a Eu[r]opean supplier, but it does not
yet have type approval to be used in North America
Still working on it

Ian Sharp
Engineering Supervisor
CFRB CFRX CKFM CJEZ
SRI Toronto
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dxAce
Michigan
USA