[time-nuts] Mounting GPS Antenna on Steel Roof

[Matthew Smith]

>> So my Trimble ACE II and Moto Oncore modules will tolerate RS232 levels 
>> without conversion?  Are we absolutely sure on this - I don't want to 
>> fry anything!

Bruce, Chris, thanks for the confirmation.

I'll go back to the idea of using the MAX232 equivalent as originally 
planned.

I'm also putting one of these between the MAX232 and the GPS module:

<http://focus.ti.com/docs/prod/folders/print/iso7231m.html>

(That's for the Oncore; it's got two channels in one direction, one in 
the other, making it ideal for TX/RX+PPS.  I'll probably use one of 
these with a one-each-way for the Trimbles.)

The GPS module will also be powered via a high-isolation DC-DC 
convertor.  I don't consider anything that's going to sit between my 
data network and an antenna overkill!

Cheers

M

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Matthew Smith
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