[time-nuts] Mounting GPS Antenna on Steel Roof
Didier Juges
didier at cox.net
Sat Mar 8 13:27:01 UTC 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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