Dear Martin,
thank you for clarification. Yes, please add this to the manual. We bought
those TwinRX for some phase-coherent LTE signal reception, and now they seem to
be not useful at all (without effort spent in sample rate conversion in
post-processing etc.)
I'm still wondering about the master clock rate though: I tried the benchmark
with the following settings: ./benchmark_rate --args "master_clock_rate=200e6"
--rx_subdev A:0 --rx_rate 10e6
The TwinRX is mounted on slot A and a CBX-120 is mounted on slot B. I simply
wanted a streaming test on the first TwinRX channel.
During device initialization I get the following warnings, see below. Can you
please comment on them?
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
[WARNING] [X300] Cannot update master clock rate! X300 Series does not allow
changing the clock rate during runtime.
[WARNING] [X300 RADIO] Requesting invalid sampling rate from device: 200 MHz.
Actual rate is: 100 MHz.
Using Device: Single USRP:
Device: X-Series Device
Mboard 0: X310
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: TwinRX RX0
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: Unknown (0x0094) - 0
TX Channel: 1
TX DSP: 0
TX Dboard: B
TX Subdev: CBX-120 TX
[00:00:05.874991] Setting device timestamp to 0...
.....
Cheers,
Emanuel
________________________________
Von: Martin Braun [martin.br...@ettus.com]
Gesendet: Freitag, 11. Januar 2019 20:44
An: Staudinger, Emanuel
Cc: USRP-users@lists.ettus.com
Betreff: Re: [USRP-users] X310 witn TwinRX: master_clock_rate issue
Emanuel,
the TwinRX only works with 200e6 clock rate. The analog filtering is not
designed for other rates. So if you have even one TwinRX, you need 200e6. I'll
make sure we update our manual to clarify that.
-- M
On Fri, Jan 11, 2019 at 4:51 AM Emanuel via USRP-users
<usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>> wrote:
Dear Ettus team,
we have a configuration of an X310 with one TwinRX and one CBX-120 front-end.
uhd_usrp_probe shows both front-ends correctly. The latest UHD release is used.
Now if I want to use, e.g., benchmark_rate or an application in Gnuradio, I get
the following warnings:
* Not setting the master_clock_rate raises a warning that a dynamic
change is not possible and the maximum sampling rate is 100 MHz.
* Setting the master_clock_rate to 184.32 MHz raises a warning too that
it cannot be set and settings for an unknown front-end are applied.
I found an old mail-thread that TwinRX does not support LTE frequencies. Is
this right? We require LTE sampling frequency. Which master_clock_rate settings
are possible in combination with TwinRX and X310?
Best regards,
Emanuel
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