On 12/10/2019 05:12 PM, Lukas Haase wrote:
Hi Marcus,
Von: "Marcus D. Leech" <[email protected]>
[...]
You're using the MANUAL policy for BOTH DSP and RF. Let the automatic
"stuff" do its thing, with the only difference being integer-N tuning.
Pretty incredible, I think I found the(?) issue.
https://kb.ettus.com/UBX#Phase_Synchronization:
"If you are operating the UBX at frequencies below 1 GHz and need phase synchronization, then it is
necessary to select a 20 MHz daughterboard clock rate, instead of using the default 50 MHz rate [...] If
you're using GNU Radio, then you can add "dboard_clock_rate=20e6" to the "Device
Arguments" field of the properties for the UHD Sink and UHD Source blocks."
I did this and lo and behold, the phase stays constant across tunes!
It even works without mode_n=integer most of the time ... I think sometimes I
get the frequency shift I was mentioning in a previous message.
With mode_n=integer it works for all frequencies I have tried. I really hope I
did not miss anything.
Well, that is something I did not know, although perhaps I should
have. Hard to keep *everything* in my brain about all the various bits of
hardware Ettus has released in the last few years...
Please let us know if there's anything *else* that crops up...
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