UmTRX

umtrx@lists.osmocom.org

189 discussions

timestamp transmission accuracy
by Usman Haider 20 Aug '16

20 Aug '16

Hi, I am trying to run an application written in GNU Radio. The application insert tags e.g. "tx_time", "tx_sob" to control the transmission time. The value of "tx_time" is such that data is transmitted at start of new second. But I observe that the transmission and PPS is not synchronized when I see the transmission and PPS on scope. Sometime the transmission is late and sometime it is early. Has anyone faced this issue? Are there any examples that I can test. Thanks. -- Usman

1 1

umTRX and GNURADIO
by George Minich 08 Feb '16

08 Feb '16

Good-day, I have been having difficulty trying to locate a HOWTO or other document outlining how to use/configure GNURADIO for the umTRX. I understand that GNURADIO will work with the umTRX however am not yet savvy with SDR and do not want to jump through hoops trying to get this working. If someone can point me in the right direction, it would be appreciated. Thank you George

2 1

Regulator Synchronization
by Sylvain Munaut 25 Nov '15

25 Nov '15

Hi, I know that on the UmTRX the switching controllers ( ST L5973 ) are all synchronized together. IIRC the earlier versions of the UmTRX didn't have this and I'm wondering if you really noticed a difference due to this change ? Cheers, Sylvain

2 1

umtrx - OpenBTS UMTS Support
by Amber and Sarosh 17 Aug '15

17 Aug '15

HiCan you please confirm if umtrx works with OpenBTS-UMTS version? Regards, Amber & Sarosh

2 4

Running two BTS with a single UmTRX.
by Andrew Back 29 Jul '15

29 Jul '15

It's now possible to run two fully independent BTS — which could be on a different band or network — with a single UmTRX. To find out more see: http://umtrx.org/multi-bts-with-osmocom-and-a-single-umtrx/ Cheers, Andrew -- Andrew Back http://carrierdetect.com

1 0

1.0.4 driver release
by Alexander Chemeris 22 Jul '15

22 Jul '15

Hi all, We've just tagged 1.0.4 release of the UmTRX host driver. A short summary of the changes: * Do not add 'g' to a git id when creating a version string. * Proper debianization. * Add ability to set diversity switches position from UHD args. * By default route each Rx channel to it's own antenna. * JSON API to question/control property tree of a running UHD app. Useful for querying sensors and for debugging purposes. * Python utility to query VSWR from a running UHD app in real time using JSON API. * Fix DC and IQ calibration utilities. Binary build for Ubuntu will soon be available from the MyriadRF PPA. -- Regards, Alexander Chemeris. CEO, Fairwaves, Inc. https://fairwaves.co

1 0

Query - Running two ARFCN on UmTRX using OsmoBTS
by Amber and Sarosh 18 Jun '15

18 Jun '15

Hi All, We want to run two independent ARFCNs on UmTRX using the two TRXs on the device using osmo-bts, but just as trx 0 is defined in osmobts.cfg we cannot define trx 1. Can someone please help us accomplish this? Also please inform if it is possible that we run one TRX on GSM900 and another on 1800? Note: we have compiled the openbsc setup as per instructions at http://openbsc.osmocom.org/trac/wiki/network_from_scratch using the jolly/multi-trx branch. Regards, Amber & Sarosh

5 18

UmTRX hardware cost
by GeorgeM 13 Jun '15

13 Jun '15

Hello Alexander, Is the cost of the most current revision (2.3.1) of the UmTRX $950 as indicated on the Fairwaves website for the 2.2 revision? Also, please let me know about lead times for the umTRX. Thank you George

1 0

OpenBTS UMTS with UmTRX
by Amber and Sarosh 11 Jun '15

11 Jun '15

Hi, Can someone please confirm if OpenBTS UMTS is supported with Fairwaves UmTRX? Regards, Amber & Sarosh

2 1

UmTRX uhd_usrp_probe command "holler protocol" error
by Kea Barnes 19 May '15

19 May '15

Hi, I have been following the instructions at (http://www.rs-online.com/designspark/electronics/eng/blog/running-a-gsm-net work-on-the-raspberry-pi-2) but have encountered a strange error when I run the "uhd_usrp_probe" command, stating: " linux; GNU C++ version 4.6.3; Boost_105000; UHD_003.008.002-151-gbf4f50de -- Opening a UmTRX device... 192.168.10.2 Error: RuntimeError: NotImplementedError: holler protocol not implemented " I have done a search on Google for the error but there doesn't seem to be any information on it. Do you have any idea what is causing it? Any help would be much appreciated. Should you be interested in knowing the exact commands I ran when following the instructions, let me know and I'll write them out. Regards, Kea

1 1

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