RE: [Discuss-gnuradio] Problem using benchmark_rx.py

[Tom Rondeau]

> From: address@hidden
[mailto:address@hidden On Behalf Of Tarun
Tiwari
> Sent: Thursday, December 07, 2006 12:25 AM
> To: address@hidden
> Subject: [Discuss-gnuradio] Problem using benchmark_rx.py
>
> Hi,
>
> I am trying to transmit packets using benchamark_tx.py and recieve them
using benchmark_rx.py. As mentioned in README file I started first
benchmark_rx.py at one 
> machine then started benchmark_tx.py on another machine, but I dont see
any print on receiver machine. I am using following commands: 
>
> Tx Machine:
> address@hidden ~]# ./benchmark_tx.py -f 100e6 --tx-amplitude=3000 -M 2 -r
100e3 -s 1000
>
> Rx Machine:
> address@hidden ~]# ./benchmark_rx.py -f 100e6
> >>> gr_fir_fff: using SSE
>
> and I dont get any output.
>
> Can somebody guide me how to succesfully receive the transmitted packets?
>
> Thanks in advance.
>
> Tarun

Try using the '-v' (verbose) flag on both Rx and Tx, which will give you all
the information about the modulation, bit rate, etc. The most likely
candidate here is that you've specified the bit rate (100 kbps, GMSK) on the
transmitter but not the receiver. The receiver defaults to 500 kbps. Use the
'-r 100k' on your receiver as well.

Are you transmitting over the air, or connected over cable? And what
daughterboards are you using? This will impact the transmit amplitude you'll
need. What you've specified is a pretty good mid range for most setups. I
only point this out as the next place to look once you've corrected the bit
rate and it still doesn't work.

Tom