[time-nuts] Mounting GPS Antenna on Steel Roof

[Brian Kirby]

Attached is a interface for an Oncore VP receiver.  You will have to 
check - I believe the GT and UT use the same connections as the VP.

Brian Kirby wrote:
> The inverter is required because the Motorola GPS receiver uses TTL and 
> the PC serial port uses RS232.
>
> RS232 uses a positive voltage of +3 to +25 volts to indicate a logic 
> zero, and a negative voltage of -3 to -25 volts to indicate a logic one.
>
> Brian KD4FM
>
>
>
> Bruce Griffiths wrote:
>   
>> 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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>>   
>>     
>
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