Jim,
If I understand what you are attempting (I may well not), you might
consider the approach taken here:
https://github.com/tejeez/rtl_coherent
and here:
https://github.com/tejeez/rtl_coherent/blob/master/hardware/simple/README.md
or order a noise-source and antenna switches from here:
http://coherent-receiver.com/products/rtl-sdr-extension-card/noise-source
http://coherent-receiver.com/products/rtl-sdr-extension-card/antenna-switch
(disclaimer: no personal connection to above links)
Dave
On 10/9/17 9:58 AM, David Witten wrote:
Jim,
If I understand what you are attempting (I may well not), you might
consider the approach taken here:
that is where you have a common clock distributed to the RTLs
"A single 28.8 MHz reference clock is distributed to all dongles. "
What I want to do is have the dongles completely independent running
with their own computer off a battery. Capture the data to a SDcard
and then post process it to do the interferometry
And do this with a self contained calibration approach (i.e. not depend
on there being a convenient radio station which has a signal in band, etc.)