Hi Paul,
I am looking into using one of my SuperStar GPS receivers for this. I'll
just tap into the circuit at the 35.42 MHz filter. I just need to build up
an amplifier for some addional level contol plus providing isolation for the
SuperStar. I am going to use the 10 MHz TCXO that's on the receiver to
start, then if that much works OK I'll use the 10 MHz signal from the
Odetics unit. I'll keep you informed on my progress. 73, Doug, K4cle.
Connected by DROID on Verizon Wireless
-----Original message-----
From: paul swed <[email protected]>
To: Discussion of precise time and frequency measurement
<[email protected]>
Sent: Thu, Aug 25, 2011 15:47:59 GMT+00:00
Subject: Re: [time-nuts] Austron GPS antennas
Thread died off is it still going?
On Thu, Aug 18, 2011 at 6:32 PM, Magnus Danielson <
[email protected]> wrote:
On 18/08/11 23:49, [email protected] 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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