[ntp:questions] Isolated Network Drift Problem

David Woolley david at ex.djwhome.demon.co.uk.invalid
Wed Nov 26 08:05:03 UTC 2008

Richard B. Gilbert wrote:
> Steve Kostecke wrote:
>> On 2008-11-25, Cal Webster <cwebster at ec.rr.com> wrote:
>>> ... We'd have to run a long cable [to the GPS18LVC] though,
>>> the computer lab has no windows and the roof is the most logical place
>>> to put an antenna. I don't think USB will handle that much line loss.
>> It is RS-232, not USB.
> RS-232 specifies a 50 foot maximum!

You used to be able to get RS 422 balanced line driver convertors, for 
driving long lines.

However the best solution is generally to use an amplified antenna, as 
the group delay behaviour will be much better at microwave than at baseband.

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