[time-nuts] Austron GPS antennas

[paul swed]

Thread died off is it still going?


On Thu, Aug 18, 2011 at 6:32 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> 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....
>
>
> Cheers,
> Magnus
>
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