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CC1125: Custom board designed for 915MHz could be used for 920MHz in Japan?

Part Number: CC1125
Other Parts Discussed in Thread: CC1190, , CC1120, CC1200


We have developed a custom board with CC1125+CC1190, following your tips and your examples (many thanks TI), which works perfectly in the range of 915MHz (it is certified for Americas).

Now, we have received a proposal to use that board on Japan, but studying the range of ISM bands on Japan I see that we need to work on range 920 MHZ and upper (and re-certified it).

Could we use the same board without changes on the components? Or is it necessary to change components as the same as the change from 868 to 915MHZ? Even, in the worst case, is it necessary to change the design?

Many thanks in advance!