[time-nuts] Austron GPS antennas

Magnus Danielson magnus at rubidium.dyndns.org
Thu Aug 18 22:32:04 UTC 2011

On 18/08/11 23:49, k4cle at aol.com wrote:
> Hi Magnus, thanks for that information.  I had forgotten about that
> Plessey GP2010 and GP2015 RF chip. The only problem is that you have to
> do a divide by 7 on the 40 MHz signal that Plessey did in the GP2021
> correlator IC. Using an old SuperStar RX is a good reconmendation.
> Thanks. Doug, k4cle.

There is a whole little line of GPS receivers of the same chips.

Hacking in external clock onto a SuperStar isn't all that hard.

You will not have to do the divide by 7 in this case, For this 
application you get 35,42 MHz out in the second filter stage, just tap 
in on that with a diffrential pair after the filter and you are 
essentially done. In the GP2010/2015 topology it goes back in for AGC 
and sampler action. If your receiver expects the 35,42 MHz signal, it 
gets inserted into that place from a receiver buffer with filter and 
then the rest of the analog and digital path is continued... that's how 
they use up two GP2010/2015 chips, but can get away with longer cable 
runs since the damping of 35,42 MHz is much less than that of 1575,42 
MHz in RG-58....


More information about the time-nuts mailing list