On Apr 24, 12:53*pm, Mike the Strike wrote:
Unfortunately those "unused" 8.3kHz channels don't actually exist - they are already occupied by the existing 25kHz channels.

I would be surprised if a "25kHz" radio actually used more than 4kHz
on each side of the carrier, interfering with the "unsused" channels.

BUT, I would be much less surprised if a "25 kHz" radio, especially an
older one, was adversely affected by a transmission made 8.33 kHz
away.

Bart