@n2pqq
You can modify the IC-R8600 screen colors.
If you
don't have an SD Card then skip to the bottom of this message and just click on the link. If you
have an SD Card, backup all your settings using an SD Card inserted into the IC-R8600. Doing this allows you to revert back to the way you've gotten your IC-R8600 setup in case you mess things up.
Press '
Menu'
Tap on '
Set'
Scroll down one screen and tap on '
SD Card'
Tap on '
Save Setting'
Tap '
<<New File>>'
or tap on an existing an backup file i.e. 'Set20180101_01' -- you'll be prompted to overwrite the existing file. The choice to overwrite is yours.
These settings are pretty cool. Click the link below. Read the document, it's pretty self explanatory.
Icom IC-R8600 "SPECTRUM SCOPE" Adjustments:
http://webpages.charter.net/n9ewo2/icr8600_scope.pdf
You can change the colors to suit yourself.