I have a JA FT-857M (50W) and a US FT-857D (100W).
The hidden service menu can be turned on with the US-857 only, not with the JA-857 so I cannot change the RF output of JA-857.
And both US-857 and JA-857 jumpers on the main circuit boards look the same but what happens when modding them are different.
I suppose the meaning of each jumper will vary by the embedded CPU programs or the regions and the models of the main circuit board, but I'm not sure.
// HIRO, JJ1FXF
HIRO, JJ1FXF