Forum: GNU Radio why is bandwidths of benchmark_tx.py and tunnel are different

I noticed that the bandwidths of benchmark_tx.py is wide and tunnel.py 
is
narrow in the same frequency and same bit rate. I run uhd_fft on machine 
A,
then run
*./benchmark_tx.py -f 2.42G -r 1M*
and
*sudo ./tunnel.py -f 2.42G -r 1M*
on machine B in turn. I got the uhd_fft wave as attached. Anyone can
explain why it happens? And is there any way to tune the bandwidth of
benchmark and tunnel?

On 06/26/2012 10:08 AM, Weixian Zhou wrote:
> I noticed that the bandwidths of benchmark_tx.py is wide and tunnel.py is
> narrow in the same frequency and same bit rate. I run uhd_fft on machine A,
> then run
> *./benchmark_tx.py -f 2.42G -r 1M*
> and
> *sudo ./tunnel.py -f 2.42G -r 1M*
> on machine B in turn. I got the uhd_fft wave as attached. Anyone can
> explain why it happens? And is there any way to tune the bandwidth of
> benchmark and tunnel?
>

Perhaps there is not data for tunnel.py to transmit? In contrast,
benchmark tx is constantly transmitting. -josh