[Discuss-gnuradio] Display Problem with QT GUI Vector Sink

[gnuradio]

Dear all,

I built an angle-of-arrival system using four Ettus USRP2. I'm facing a 
problem when trying to display a vector containing the calculated 
MUSIC-Spectrum using a “QT GUI Vector Sink”. The vector sink won't 
display any data for the first two minutes, and then it is starting to 
show very old values. When I use the block “Vector to Stream” and a 
simple “QT GUI Time Sink” instead, the values are displayed immediately 
without delay.

The block “music_cf” feeding the vector sink is a sync_decimator, 
generating one vector of 181 elements for every 1000 input samples. I've 
provided a shortened version of my c++ code in the attachment, without 
the actual mathematics.

What could be the reason for this huge delay when using the “QT GUI 
Vector Sink”? Is it a buffering problem?

Best regards,
Simon

Block Diagram:
http://fs1.directupload.net/images/150903/7cnqbzup.png

music_cf_impl.cc
Description: Text Data