[time-nuts] Mounting GPS Antenna on Steel Roof

Didier Juges didier at cox.net
Sat Mar 8 08:27:01 EST 2008


The MAX232, like all RS-232 interface chips I have ever come across, inverts
the signal.

Didier KO4BB 

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of GandalfG8 at aol.com
> Sent: Saturday, March 08, 2008 2:48 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Mounting GPS Antenna on Steel Roof
> 
>  
> In a message dated 08/03/2008 03:57:02 GMT Standard Time, 
> kirbybq at bellsouth.net writes:
> 
> 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.
> 
> 
> 
> -----------
>  
> My Motorola Oncore test rig uses a Max232 to interface the RS232, no  
> inverter, and works fine.
>  
> regards
>  
> Nigel
> GM8PZR
> 
> 
> 
>    
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