In reply to M0DFA:
I’ve not heard of that particular set but if it is a true PMR set & not just a “licence exempt” low power 49MHz transceiver there may be some information available from members of the UK 6 Metre group.
I still have a couple of Realistic 49MHz transceivers, which I keep for whenever I need to conduct EMC tests with my neighbours. I remember a mod appearing in either Radcom or Practical Wireless to convert them to 6m FM, but I didn’t bother converting mine.
I also have a pair of PMR446 handelds for the same purpose.
Thankfully, neither have needed to be used for several years.
I hope that link is helpful.