Patrick, you could be right.
I'm not at the plane right now, and probably won't get out there for a couple of days. I'll check it out next time I'm at the airport.
The manual reads: To set the COM channel spacing: 1. Select "COM Configuration" and press ENT. 2. Turn the small right knob to select " 8.33 kHz" or "25.0 kHz" and press ENT.

Geoff
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N10473
Huh I don't know