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Re: [Discuss-gnuradio] WBX power level

From: Jason Abele
Subject: Re: [Discuss-gnuradio] WBX power level
Date: Mon, 14 Jun 2010 11:03:28 -0700

>>> 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

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.


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