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On 09/10/2017 08:58 PM, Dan CaJacob
wrote:
I could be wrong, but I thought the SBX was one of
the few daughter cards that starts with s known phase offset?
Only if you ask it to do so, and only if it's sharing clock with its
buddies...
On Sun, Sep 10, 2017, 2:49 PM Fulcrum Associates
< address@hidden>
wrote:
Dear All,
I have a couple of USRPs connected, through a
strong
attenuator to a signal generator (NWT4001). While the units
have a MIMO
option, I don't have that cable. (Option A) When I run the GRC
as
attached, I see too good a result to the extent that the
differential
Phi seems to range over +/- 5 degrees.
What I had hoped to prove to myself that two
N200 with SBX
would have a varying offset without MIMO cable, then I would
connect the
MIMO cable and move the USRPs into a multi-unit and enable
GPSD O/B on
the unit which has the feature and MIMO for one without
(Option B) and
that the phase differential would improve noticeably and be a
variable
constant, but it didn't.
If it had, but there still was a fixed phase
offset which
varied each time it was setup (which is what I would expect
under B)
then I would hand-code the SBX stream initialisation code to
remove the
offset.
Does my FG not measure what I claim to be
wishing to
measure?
If it does measure it correctly, why do my
expectations
of options A and B leading to a different (though improved)
situation
not eventuate?
Kind Regards,
John
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Very Respectfully,
Dan CaJacob
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