[aprssig] Argent open tracker

[Bill Vodall]

> Thats my point - they want to act at RS232 but they can only go TTL levels.
>
> RS232 height would be > 7 volts
> RS323 height would be < 7 volts
>
> Garmin
>
> RS232F is VCC
> RS232F is 0 Volts

That's why you need the inverter Tom mentioned.  The Levels aren't
critical - at least not for typical applications.   The data is
'inverted' and that is critical.

Bill