I have a new ettus B200 with TCXO (no antenna) plugged into my ZOTAC ZBOX USB3
port running Debian 7.7. I recently built gnuradio with the build-gnuradio
script.
I was trying to build a broadcast FM radio receiver from available examples
and was having some problems, so I created a simple flow of UHD source feeding
an FFT sink and I still get the sample problem. Here is my grc output:
<code>
linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.008.000-52-g2068af70
<<< Welcome to GNU Radio Companion 3.7.5.1>>>
Preferences file: /home/tom/.grc
Block paths:
/usr/local/share/gnuradio/grc/blocks
/home/tom/.grc_gnuradio
Loading: "/home/tom/grc/uhd-test.grc"
Done
Showing: "/home/tom/grc/uhd-test.grc"
Generating: "/home/tom/grc/top_block.py"
Executing: "/home/tom/grc/top_block.py"
linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.008.000-52-g2068af70
Using Volk machine: avx_64_mmx_orc
-- Operating over USB 3.
-- Detecting internal GPSDO.... Found an internal GPSDO
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 32.000000 MHz...
-- Actually got clock rate 32.000000 MHz.
-- Performing timer loopback test... pass
-- Setting master clock rate selection to 'automatic'.
-- Setting references to the internal GPSDO
-- Initializing time to the internal GPSDO
UHD Warning:
get_time: ValueError: get_nmea(): no GPRMC message found
UHD Warning:
get_time: ValueError: get_nmea(): no GPRMC message found
Traceback (most recent call last):
File "/home/tom/grc/top_block.py", line 92, in<module>
tb = top_block()
File "/home/tom/grc/top_block.py", line 58, in __init__
channels=range(1),
File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line
122, in constructor_interceptor
return old_constructor(*args)
File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line
1752, in make
return _uhd_swig.usrp_source_make(*args)
RuntimeError: ValueError: Timeout after no valid message found
</code>
It seems there is a lot of discussion on "no GPRMC message found" UHD warning
that seems to point to no GPS signal, but I was under the impression from the
ettus.com website that a GPS antenna wasn't required for the TXCO.
Any help much appreciated.
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