Hello,
Do you have any suggestions as to how to measure the frequency delta
between the transmit channel and the receive channel?
As I sat down to do this, I realized I have no real way to do that.
Mike
On 03/24/2019 03:23 PM, Marcus D. Leech via USRP-users wrote:
On 03/24/2019 02:39 PM, Freedman, Michael - 1008 - MITLL via
USRP-users wrote:
It is not just a phase offset. It is a frequency offset. The phase drifts
between the two. I can tolerate a phase offset at startup. A freq offset
however is causing problems.
Mike
Sent from my iPhone
On Mar 24, 2019, at 4:28 AM, Marcus Müller<marcus.muel...@ettus.com> wrote:
Can you elaborate on what "not coherent" means to you – the relative
phase should be constant after each tune, but if you don't tune
simultaneously, i.e. with timed commands, random at each tune.
Best regards,
Marcus
Also, what version of UHD? What hardware rev of UBX cards?
On Sat, 2019-03-23 at 17:06 -0400, Michael R. Freedman via USRP-users
wrote:
Hello,
I have an issue where I tune both the TX and RX side of a UBX40 card
in
an X310 to the same frequency and find that the transmitted signal
and
what is received are not coherent. I am using an external 10MHz
reference and have tried the documented suggestions.
at 150MHz it is coherent.
at 155MHz it is NOT coherent.
I have tried setting the dboard_clock_rate to 20MHz. This made the
problem appear at 150MHz as well. I've tried integer_n tuning.
I have verified that the ref_lock and lo_lock are both true.
Any suggestions?
Mike
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