# Daughterboard performance

**URL:** <https://www.ruby-forum.com/t/daughterboard-performance/203345>\
**Category:** GNU Radio\
**Created:** [February 18, 2011, 4:57am UTC](https://www.ruby-forum.com/t/daughterboard-performance/203345 "2011-02-18T04:57:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\
**Post date:** [February 18, 2011, 4:57am UTC](https://www.ruby-forum.com/t/daughterboard-performance/203345/1 "2011-02-18T04:57:03Z")

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Hi

I used XCVR2450 daughterboard for TX and RX on USRP2 and everything is  
fine.  
Recently I began to use RFX2400 and DBSRX-LF, which I found out the  
performance are much worse than XCVR2450.  
Observed from FFT plot, I found out there are some weird spectrum  
response  
using RFX2400 and DBSRX-LF respectively.  
Furthermore, I am not able to decode some OFDM example anymore! (I  
compensated the correct carrier frequency already)

I am wondering if I need to update something like firmware, in order to  
use  
those two new daughterboards.  
Thanks,

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**Author:** ![guanbo\_z](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/a5b964/32.png) [@guanbo\_z](https://www.ruby-forum.com/u/guanbo_z)\
**Post date:** [February 18, 2011, 5:43am UTC](https://www.ruby-forum.com/t/daughterboard-performance/203345/2 "2011-02-18T05:43:16Z")

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> I am wondering if I need to update something like firmware, in order  
> to use those two new daughterboards.  
> Thanks,  
> You haven’t given us much to go on.

What does your test setup look like? Are you using USRP1? USRP2?  
USRP-N210? Using UHD?

Are you tests over-the-air or with cables? Are you using attenuators in  
the cabling?

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Shirleys Bay Radio Astronomy Consortium

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**Author:** ![guanbo\_z](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/a5b964/32.png) [@guanbo\_z](https://www.ruby-forum.com/u/guanbo_z)\
**Post date:** [February 18, 2011, 3:38pm UTC](https://www.ruby-forum.com/t/daughterboard-performance/203345/3 "2011-02-18T15:38:10Z")

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It is USRP2, my system setup is Ubuntu 9.04+Gnuradio3.2.2.

My test codes includes the benchmark OFDM, BBN code, which i tested  
smoothly before both cabling and over the air.

TX uses XCVR2450, the RX uses RFX2400 or DBSRX-LF.

Best,  
Guanbo