# aUaU FM receiver

**URL:** <https://www.ruby-forum.com/t/auau-fm-receiver/241184>\
**Category:** GNU Radio\
**Created:** [May 16, 2014, 5:00pm UTC](https://www.ruby-forum.com/t/auau-fm-receiver/241184 "2014-05-16T17:00:57Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [May 16, 2014, 5:00pm UTC](https://www.ruby-forum.com/t/auau-fm-receiver/241184/1 "2014-05-16T17:00:57Z")

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Hi,

I built a FM receiver working with a LiveUSB and a USRPB100 device. It  
worked fine, but when I installed Ubuntu and GNURadio in a virtual  
machine,  
the audio is distorted. The console types aU letters. But I generate a  
wav  
file and the quality is good, the problem is with the audio sink.

Regards,

Pablo.

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**Author:** ![pablo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/ad7895/32.png) [@pablo](https://www.ruby-forum.com/u/pablo)\
**Post date:** [May 16, 2014, 5:09pm UTC](https://www.ruby-forum.com/t/auau-fm-receiver/241184/2 "2014-05-16T17:09:34Z")

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On 05/16/2014 10:59 AM, Pablo F. Alonso wrote:

> Pablo.
> 
> * * *
> 
> Discuss-gnuradio mailing list  
> [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)  
> USB and Audio performance in VMs is highly variable and unpredictable.  
> Sometimes it’s fine, sometimes it’s really poor.

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**Author:** ![pablo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/ad7895/32.png) [@pablo](https://www.ruby-forum.com/u/pablo)\
**Post date:** [May 16, 2014, 5:12pm UTC](https://www.ruby-forum.com/t/auau-fm-receiver/241184/3 "2014-05-16T17:12:02Z")

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I was unable to get GRC to perform acceptably under VMWare on a very up  
to  
date system. The USB support is very slow.

Mike H., N4PLE  
Sellersburg, IN USA

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**Author:** ![pablo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/ad7895/32.png) [@pablo](https://www.ruby-forum.com/u/pablo)\
**Post date:** [May 17, 2014, 1:03am UTC](https://www.ruby-forum.com/t/auau-fm-receiver/241184/4 "2014-05-17T01:03:17Z")

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Hi Pablo -

Have you tried tuning the audio rate a bit? When you see the 'aU’s, do  
you  
also hear distortion in the audio?

Cheers,  
Ben