Re: [Discuss-gnuradio] WBX power level

[Jason Abele]

On Mon, Jun 14, 2010 at 11:03 AM, Jason Abele <address@hidden> wrote:
>>>> Hi All,
>>>>
>>>> Has anyone measure the power level coming out of their WBX board?
>>>>
>>>> Measured on a Gigatronics 8541 microwave
>>>> power meter connected directly at the back of the USRP2 I am getting
>>>> (with a CW carrier)
>>>>
>>>> 100 MHz about 35 mW
>>>> 1.3 GHz about 15 mW
>>>>
>>>> Ettus quote
>>>>
>>>> 50 - 100 mW<  1.2 GHz
>>>> 30 - 70mW>  1.2 GHz
>>>>
>>>> I know measuring power is notoriously inaccurate but I was wondering
>>>> what others have found.
>>>>
>>>> Setup USRP2 WBX UHD
>>>>
>
> Please try the following command with non-UHD for comparison:
>
> usrp_siggen_gui.py -x 250k -i 64 --tx-gain=25 -A 1.0  -f 1.3G

My mistake here, please use -i 16 ...
usrp_siggen_gui.py -x 250k -i 16 --tx-gain=25 -A 1.0  -f 1.3G

>
> You should see about 50mW (17dBm) at 1.30025GHz
>
> If you change the final argument to 100M you should see around
> 80-100mW (19-20dBm) in the tone at 100.25MHz
>
> If you can confirm those numbers, perhaps we have a constant scalar
> missing in either your flowgraph or the UHD code someplace.
>
> Thanks
> Jason
>