[time-nuts] Mounting GPS Antenna on Steel Roof

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Mar 7 04:45:47 EST 2008


Hal Murray wrote:
>> Well, I plugged my Oncore UT+ into my PC and it didn't work until I
>> put a level shifter in... no damage but no data either. So far I've
>> been lucky in that every device I tried that needed a level shifter
>> wasn't damaged by the lack of one. 
>>     
>
> The normal MAX232 type level shifters include an inverter.
>
> So even if the voltage levels work without a level shifter, the signal will 
> be upside down.
>
>
>   
To play safe, if one isnt sure that an inverter is required or not an 
exclusive OR can be used so that the signal can be inverted or not as 
required.

Bruce



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