# Problems with gr-osmosdr and dual-channel B210 support

**URL:** <https://www.ruby-forum.com/t/problems-with-gr-osmosdr-and-dual-channel-b210-support/231740>\
**Category:** GNU Radio\
**Created:** [August 27, 2014, 2:32pm UTC](https://www.ruby-forum.com/t/problems-with-gr-osmosdr-and-dual-channel-b210-support/231740 "2014-08-27T14:32:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [August 27, 2014, 2:32pm UTC](https://www.ruby-forum.com/t/problems-with-gr-osmosdr-and-dual-channel-b210-support/231740/1 "2014-08-27T14:32:49Z")

</div>

I’m getting this startup sequence here:

linux; GNU C++ version 4.8.2; Boost\_105400; UHD\_003.007.002-85-g5ffc835e

Using Volk machine: ssse3\_32\_orc  
gr-osmosdr v0.1.1-13-g58d95b51 (0.1.2git) gnuradio 3.7.4  
built-in source types: file fcd rtl rtl\_tcp uhd hackrf bladerf rfspace  
– Operating over USB 2.  
– Initialize CODEC control…  
– Initialize Radio control…  
– Performing register loopback test… pass  
– Performing register loopback test… pass  
– Performing CODEC loopback test… pass  
– Performing CODEC loopback test… pass  
– Asking for clock rate 15.200000 MHz  
– Actually got clock rate 15.200000 MHz  
– Performing timer loopback test… pass  
– Performing timer loopback test… pass  
– Using subdev spec ‘A:A A:B’.

FATAL: output port 1 out of range for gr uhd usrp source(51)

Trying to fill up 2 missing channel(s) with null source(s).  
This is being done to prevent the application from crashing  
due to gnuradio bug #528.

The device arg that is being used to gr-osmosdr is:

uhd,nchan=2,type=b200,master\_clock\_rate=15.2e6

–  
Marcus L.  
Principal Investigator  
Shirleys Bay Radio Astronomy Consortium

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