TRX Clock calibration

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Alexander Chemeris alexander.chemeris at gmail.com
Wed Jul 16 00:46:44 UTC 2014


Choukoumoun,

The question is related to the osmo-trx more than to UmTRX, so I'm
moving it to the Osmocom mailing list:

On Tue, Jul 15, 2014 at 8:17 PM, choukoumoun <choukoumoun at gmail.com> wrote:
> Hello guys.
>
> I have a UMTRX my UHD/OPENBTS or UHD/OSMO-TRX same working fine but wen i
> start osmo-trx and openbts i have this error

Could you specify where did you get sources and which exact versions
and commit numbers do you use?

Did you try to use osmo-trx with Osmocom software rather than with OpenBTS?

> Osmo-trx :
>
> linux; GNU C++ version 4.8.1; Boost_105300; UHD_003.004.000-4fa97a1
>
> Config Settings
>    Log Level............... NOTICE
>    Device args............. addr=192.168.10.2
>    TRX Base Port........... 5700
>    TRX Address............. 127.0.0.1
>    Channels................ 1
>    Samples-per-Symbol...... 4
>    External Reference...... Disabled
>    C0 Filler Table......... Disabled
>    Diversity............... Disabled
>    Tuning offset........... 0
>
> -- Opening a UmTRX device...
> -- Current recv frame size: 1472 bytes
> -- Current send frame size: 1472 bytes
> -- Setting UmTRX 4 SPS
> -- Transceiver active with 1 channel(s)
>
> ALERT 139940970051328 02:13:33.7 UHDDevice.cpp:993:writeSamples: UHD: Device
> send timed out
> "Constantely" .....
>
>
> anybody have a idea ?
>
>
> my usrp probe out :
>
> linux; GNU C++ version 4.8.1; Boost_105300; UHD_003.004.000-4fa97a1
>
> -- Opening a UmTRX device...
> -- Current recv frame size: 1472 bytes
> -- Current send frame size: 1472 bytes
>   _____________________________________________________
>  /
> |       Device: UmTRX Device
> |     _____________________________________________________
> |    /
> |   |       Mboard: UMTRX-REV0
> |   |   hardware: 64000
> |   |   mac-addr: 00:50:c2:85:3f:ff
> |   |   ip-addr: 192.168.10.2
> |   |   gpsdo: none
> |   |   serial: 7
> |   |   name: UmTRX
> |   |   tcxo-dac: 2048
> |   |
> |   |   Time sources: none, external, _external_, mimo
> |   |   Clock sources: internal, external, mimo
> |   |   Sensors: ref_locked
> |   |     _____________________________________________________
> |   |    /
> |   |   |       RX DSP: 0
> |   |   |   Freq range: -6.500 to 6.500 Mhz
> |   |     _____________________________________________________
> |   |    /
> |   |   |       RX DSP: 1
> |   |   |   Freq range: -6.500 to 6.500 Mhz
> |   |     _____________________________________________________
> |   |    /
> |   |   |       RX Dboard: A
> |   |   |   ID: LMS6002D (0xfa07)
> |   |   |   Serial: 7.A
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       RX Subdev: 0
> |   |   |   |   Name: LMS6002D (0xfa07) - 0
> |   |   |   |   Antennas: RX0, RX1, RX2, RX3, CAL
> |   |   |   |   Sensors: lo_locked
> |   |   |   |   Freq range: 232.500 to 3720.000 Mhz
> |   |   |   |   Gain range VGA1: 0.0 to 126.0 step 1.0 dB
> |   |   |   |   Gain range VGA2: 0.0 to 30.0 step 3.0 dB
> |   |   |   |   Connection Type: IQ
> |   |   |   |   Uses LO offset: No
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       RX Codec: A
> |   |   |   |   Name: LMS_RX
> |   |   |   |   Gain Elements: None
> |   |     _____________________________________________________
> |   |    /
> |   |   |       RX Dboard: B
> |   |   |   ID: LMS6002D (0xfa07)
> |   |   |   Serial: 7.B
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       RX Subdev: 0
> |   |   |   |   Name: LMS6002D (0xfa07) - 0
> |   |   |   |   Antennas: RX0, RX1, RX2, RX3, CAL
> |   |   |   |   Sensors: lo_locked
> |   |   |   |   Freq range: 232.500 to 3720.000 Mhz
> |   |   |   |   Gain range VGA1: 0.0 to 126.0 step 1.0 dB
> |   |   |   |   Gain range VGA2: 0.0 to 30.0 step 3.0 dB
> |   |   |   |   Connection Type: IQ
> |   |   |   |   Uses LO offset: No
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       RX Codec: B
> |   |   |   |   Name: LMS_RX
> |   |   |   |   Gain Elements: None
> |   |     _____________________________________________________
> |   |    /
> |   |   |       TX DSP: 0
> |   |   |   Freq range: -6.500 to 6.500 Mhz
> |   |     _____________________________________________________
> |   |    /
> |   |   |       TX DSP: 1
> |   |   |   Freq range: -6.500 to 6.500 Mhz
> |   |     _____________________________________________________
> |   |    /
> |   |   |       TX Dboard: A
> |   |   |   ID: LMS6002D (0xfa09)
> |   |   |   Serial: 7.A
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       TX Subdev: 0
> |   |   |   |   Name: LMS6002D (0xfa09) - 0
> |   |   |   |   Antennas: TX0, TX1, TX2, CAL
> |   |   |   |   Sensors: lo_locked
> |   |   |   |   Freq range: 232.500 to 3720.000 Mhz
> |   |   |   |   Gain range VGA1: -35.0 to -4.0 step 1.0 dB
> |   |   |   |   Gain range VGA2: 0.0 to 25.0 step 1.0 dB
> |   |   |   |   Connection Type: IQ
> |   |   |   |   Uses LO offset: No
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       TX Codec: A
> |   |   |   |   Name: LMS_TX
> |   |   |   |   Gain Elements: None
> |   |     _____________________________________________________
> |   |    /
> |   |   |       TX Dboard: B
> |   |   |   ID: LMS6002D (0xfa09)
> |   |   |   Serial: 7.B
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       TX Subdev: 0
> |   |   |   |   Name: LMS6002D (0xfa09) - 0
> |   |   |   |   Antennas: TX0, TX1, TX2, CAL
> |   |   |   |   Sensors: lo_locked
> |   |   |   |   Freq range: 232.500 to 3720.000 Mhz
> |   |   |   |   Gain range VGA1: -35.0 to -4.0 step 1.0 dB
> |   |   |   |   Gain range VGA2: 0.0 to 25.0 step 1.0 dB
> |   |   |   |   Connection Type: IQ
> |   |   |   |   Uses LO offset: No
> |   |   |     _____________________________________________________
> |   |   |    /
> |   |   |   |       TX Codec: B
> |   |   |   |   Name: LMS_TX
> |   |   |   |   Gain Elements: None
>
>
> I make the VCXO configuration procedure with the GPS but no success...

The issue with "UHD: Device send timed out" have nothing to do with
the VCXO calibration. The issue is because of a issue in communication
between the host system and the UmTRX.

What is your hardware setup? Particularly:
 - Do you use a switch between the UmTRX and the host system?
 - Do you run it on a real hardware or in a VM?
 - Is your host system powerful enough?

-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves, Inc.
https://fairwaves.co




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