[time-nuts] Do reflections up/down the antenna cable cause aproblem with GPS?

David J Taylor david-taylor at blueyonder.co.uk
Tue Nov 22 04:37:37 EST 2016

From: Dr. David Kirkby (Kirkby Microwave Ltd)

Anything not immediately absorbed by the GPS receiver is going to be
reflected back up the coax, and could be reflected multiple times.

Only if the sending impedance of the LNA in the antenna is well off the 
nominal cable impedance, and in any case the reflection caused by mismatch 
at the GPS receiver input would be attenuated twice by the cable run.  For 
timing applications I don't believe it's an issue, and for location 
applications buildings and shielding are a far greater problem.

David GM8ARV
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk
Twitter: @gm8arv 

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