The 10.7 MHz IF output on the IC-R8500 above
30 MHz is about 10 MHz
wide, though not necessarily within 3 db.
The 10.7 MHz bandwidth is much more narrow below 30 MHz.

The IF output is taken before the IF filtering and you cannot
adjust the IF output bandwidth.

The IC-R8500 computer commands are documented in the
user manual and I used them to write tk8500 open source software
(see http://parnass.com)

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Bob Parnass, AJ9S GNU/Linux User http://parnass.com