[time-nuts] FE-.5680A trimming resolution

Azelio Boriani azelio.boriani at screen.it
Thu Feb 2 00:17:40 UTC 2012

In my opinion the work done locking the VCTCXO of the Oncore is different
from the TBolt OCXO management: the TBolt steers the OCXO based on the
received signal instead they locked the Oncore oscillator to a Cs
reference. Yes, if all the world is the same then there is no difference:
the Cs locks the VCTCXO frequency where it should be as if steered from
satellites but how can you drive an OCXO from an Oncore even with hardware
modifications?. There is an oscillator offset in the @@Ha status message...
maybe by using it?

On Thu, Feb 2, 2012 at 12:59 AM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> On 01/02/12 15:07, John Ackermann N8UR wrote:
>> There've been numerous threads on the Gnuradio mailing list about code
>> to receive GPS using the Ettus Research USRP hardware. I don't know
>> whether anyone has actually made it work, but it appears that it's been
>> the subject of quite a few academic projects.
> I bought one of those GNSS samplers, pulled data from the air and actually
> managed to have my GPS SDR written in C scan the doppler bins and
> code-phases with FFT correlation techniques (with a little help of FFTW),
> find a bird and lock the PLL up to it... locked onto the symbols and
> started spitting out the sub-code info. I wrote all the code myself except
> for the USB application. I also spent some time to start calculating
> position and such.
> I will have to get one of those Ettus Research devices to be able to do
> anything useful thought.
> So, it is certainly possible. Takes a few of the software GPS books
> alongside the ICD-GPS-200 and traditional GPS books to piece together the
> full suite of references, but it didn't take THAT long to get where I where.
> Cheers,
> Magnus
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