[aprssig] Re: GPS 18 data needed

[Chuck Gooden]

Will the 0/5 volt signal levels still work with the Kenwood THD700A?  I
was considering using a GPS 18 in my van for APRS.


Stephen H. Smith wrote:

> Concerning the GPS18:
>
> Beware!   The GPS18 does not output true bi-polar rS-232.  It behaves
> somewhat like the TinyTrak in that it outputs only "half 232"  0/5
> volt logic levels.    If your device needs true -8VDC/+8VDC true
> RS-232 levels, it may not work with the GPS18.    Apparently they
> decided to leave out a negative voltage generator in the GPS18.