Does anyone have a manual for a Dittel ATR 720B radio?

I'm having trouble programming the presets and am not sure whether the
"enter" button has a fault or whether I am simply doing something wrong.

I did note that newer Dittel radios can not be programmed unless their
voltage is at a certain optimum level. The standard voltage for the ATR720B
is 14 but I have it connected (in a glider) to a 12volt supply wiothout any
problems apart from the programming.

Cheers

Tony


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