[time-nuts] NUT4NT: Four-channel All-frequency GNSS RF-to-Bits

Bob Camp kb8tq at n1k.org
Sat Aug 13 19:53:46 EDT 2016


It’s not real clear what the second chip on the board does. If it is just a bit to Ethernet converter
then you are dealing with 2 bit data out of each of the four channels. You aren’t just doing tracking
in that case ….4 channels at 2 bits -> 8 bits per clock. Clock at 38 to 100 MHz. That could turn out
to be a very crowded Ethernet connection. 


> On Aug 13, 2016, at 5:36 PM, Michael Wouters <michaeljwouters at gmail.com> wrote:
> This board just seems to be the RF front end for a GNSS receiver. You then
> have to do the whole business of acquiring and tracking the code, and then
> do the PVT solution, at which point you can make your own 1 PPS.
> Cheers
> Michael
> On Sunday, 14 August 2016, Gregory Maxwell <gmaxwell at gmail.com> wrote:
>> On Thu, Aug 4, 2016 at 11:08 PM, Daniel Mendes <dmendesf at gmail.com
>> <javascript:;>> wrote:
>>> A new interesting toy soon to be crowdsourced:
>>> https://www.crowdsupply.com/amungo-navigation/nut4nt
>> A shame, it looks like it can be externally clocked, but I don't see a
>> way to get in and measure a PPS signal.
>> Considering the increasingly frequent jamming I see doing a multiband
>> CRPA timing receiver sounds like a fun project; but I'm not quite
>> seeing how to do really overkill timing with this device. :)
>> I guess on the NT1065 you'd want use the clk with a counter to capture
>> the position of a PPS or external reference with respect the the
>> sample clock?... and hopefully the signal processing chain from clock
>> to the ADC has a constant delay?
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