- You're using an ancient UHD version. Is there a reason you can't
>>>>use a
>>>>newer one?
>>>I am using Ubuntu 14.04 LTS and just pulled GNU Radio and UHD from the
>>>packet sources. There is no newer version available. And I don't
>>>like to
>>>compile myself unless it is absolutely necessary.
>>Consider it outdated. Ubuntu's packet sources are most of the time
>>horribly out of pace compared to GNU Radio's development process.
>>For UHD it's the same. Note that Ettus ships its own Ubuntu packages
>>for UHD*and* GNU Radio, so you can get a non-ancient version of both
>>without even compiling it.
>>By the way: GNU Radio is a software radio developer's framework. You
>>can do great things with it without touching a compiler, but at many
>>points it becomes helpful when one can write his own C++ block, so
>>you definitely need to lose your fear of compilers if you want to use
>>GNU Radio to its fullest potential:)
>
>After some hours of compiling time I could finally update GNU Radio to
>version 3.7.6 and UHD to 003.008.
>
>>>I don't think it's because of an outdated version of UHD as the
>>>"tags_demo" application is working perfectly with my current version.
>>... Well, my old tube radio also still works;)
>
>Unfortunately, even with the newest version the USRP is still
>transmitting its carrier over the air. I tried both with the Message
>Burst Source as well as with the Stream to Tagged Stream Block
>combined with setting a Length Tag name in the USRP Sink. With the Tag
>Debug Block I see tx_sob+tx_eob and the Length Tag, respectively. They
>all seem to be at the right place and have the right value.