Re: [Discuss-gnuradio] dual coherent channel rtl_sdr

[Marcus D. Leech]

On 09/25/2013 12:04 AM, Jared Clements wrote:
> Hi Marcus,
>
> Interesting discussion. I was wondering how well synchronized clocking 
> might work.  Was hoping it would work better than it sounds.  Could 
> you quantify the level of phase noise you're seeing, like with a power 
> spectral density  plot?  Just for curiosity's sake?
>
> I know of a recently updated OOT module that should have the blocks 
> you need ;-)
>
> I was hoping to build a correlating interferometer by modifying 
> several of these dongles to run off the same clock.  I may need to 
> rethink the plan.
>
> Jared
I'll get to that tomorrow night.

I just ran a simulation of what I was observing (just because the lab is 
downstairs, and I'm upstairs).

Looks like the best it does is about -40dB/c  75kHz from the carrier.  
That's bluddy awful.

phase_noise_sim.grc
Description: application/gnuradio-grc