# B200 gross frequency error

**URL:** <https://www.ruby-forum.com/t/b200-gross-frequency-error/238255>\
**Category:** GNU Radio\
**Created:** [December 29, 2013, 3:47am UTC](https://www.ruby-forum.com/t/b200-gross-frequency-error/238255 "2013-12-29T03:47:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [December 29, 2013, 3:47am UTC](https://www.ruby-forum.com/t/b200-gross-frequency-error/238255/1 "2013-12-29T03:47:49Z")

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I got a new B200, and tried to get an FM receiver working, following the  
example from [How To Build an FM Receiver with the USRP in Less Than 10 Minutes - YouTube](http://www.youtube.com/watch?v=KWeY2yqwVA0). I was able to  
get sound out of my speakers, but it came out distorted. An obvious  
problem is that the FM stations are spaced incorrectly on the FFT (looks  
like 750kHz spacing but should be 800kHz). I randomly choose 100.3 as  
the center frequency.  
Attached is my flow graph, along with the FFTs. BTW, Also on the FFT of  
the demodulated spectrum, I get my 19kHz steerio pilot tone at 45kHz.  
Whats going on? Thanks

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**Author:** ![ernie](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/eb8c5e/32.png) [@ernie](https://www.ruby-forum.com/u/ernie)\
**Post date:** [December 29, 2013, 3:49am UTC](https://www.ruby-forum.com/t/b200-gross-frequency-error/238255/2 "2013-12-29T03:49:52Z")

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flow graph, sorry