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Re: [Discuss-gnuradio] WBX power level
From: |
Charles Brain |
Subject: |
Re: [Discuss-gnuradio] WBX power level |
Date: |
Tue, 15 Jun 2010 08:28:02 +0100 |
----- Original Message -----
From: "Jason Abele" <address@hidden>
To: "Charles Brain" <address@hidden>
Cc: <address@hidden>
Sent: Monday, June 14, 2010 7:03 PM
Subject: Re: [Discuss-gnuradio] WBX power level
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.
Thanks
Jason
Hi Jason,
I got the test done this morning (after I re-installed gnuradio 3.2.2 )
Using
usrp_siggen_gui.py -x 250k -i 16 --gain=25 -a 1.0 -f 1.3G
60mW @ 1.3 GHz
126mW @ 100 MHz
Using my code and UHD (my code modified to write I = 0x7FFF, Q = 0x7FFF)
14.4mW @ 1.3 GHz
33.8 mW @ 100 MHz
Using my code and UHD ( my code modified to write I = 0x7FFF, Q = 0x0)
14.8mW @ 1.3 GHz
24.8 mW @ 100 MHz
I ran the power meter's self calibration routine before taking the measurements
this time and applied the correct frequency correction.
Looks like we have a bit missing :-(
- Charles
http://www.g4guo.blogspot.com/
- [Discuss-gnuradio] WBX power level, Charles Brain, 2010/06/12
- Re: [Discuss-gnuradio] WBX power level, Philip Balister, 2010/06/12
- Re: [Discuss-gnuradio] WBX power level, Charles Brain, 2010/06/12
- Re: [Discuss-gnuradio] WBX power level, Timothy R. Newman, 2010/06/12
- Re: [Discuss-gnuradio] WBX power level,
Charles Brain <=
- Re: [Discuss-gnuradio] WBX power level, Eric Blossom, 2010/06/15
- Re: [Discuss-gnuradio] WBX power level, Charles Brain, 2010/06/15
- Re: [Discuss-gnuradio] WBX power level, Jason Abele, 2010/06/15