[time-nuts] Question about specifications for Quartzlock GPS antenna down-converter

Magnus Danielson magnus at rubidium.dyndns.org
Sun Mar 15 13:04:31 UTC 2009

bg at lysator.liu.se skrev:
> Hi Brooke and Russel,
> Meinberg does the same thing, but they send a 10MHz - nice choice!! - up
> the coax to receive an IF of 35.4MHz.
>     http://www.meinberg.de/english/products/gpsant.htm
>     http://www.meinberg.de/download/docs/manuals/english/gpsant.pdf

As I have commented before, I suspect that they use the Zarlink chipset, 
since they have 10 MHz input and 35,4 MHz is an intermediary frequency 
in that frequency scheme which is available for insert. Using one analog 
front in the antenna and one analog front in the receiver and feeding 
them with the same 10 MHz it all works out nicely.

I don't know what solution Quartzlock is using.

The reduced damping (and hence longer cable runs) is one benefit from 
down-converting, another could be reduced phase shift problems, but I 
think for L1 receivers this is not as major issue.


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