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FTM-100's mysterious S-RF scale

The FTM-100 S-RF indicator has no scale, which makes it useless as is. I can't find any good reason for Yaesu to omit giving any information about that scale, even on the user's manual.
S-RF readings vary from one transceiver's model to another, that's a known fact, but I truly believe that Yaesu made many steps further with this absurd meter thing.

So, for all intents and purposes:

FTM-100D_S-RF.jpg, Mar 2020

Equivalent S-meter scale source: Wikipedia

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