Re: [Discuss-gnuradio] [USRP-users] getting noise for FM receiver with usrp e110 ?

[Wafa Elhajhmida]

Thanks a lot for your reply.

In fact, in order to respect the band range frequency of the SBX daughterboard Rev 5.1.

I sent an FM signal from a signal generator called NI PXIe-5673 described in this link:

http://sine.ni.com/nips/cds/view/p/lang/en/nid/205593. The signal that I generated, it is a sinus and has 900 MHz frequency.

So that I created my proper FM station on 900 MHz  to respect  the band range frequency allowed by SBX daughterboard Rev 5.1.

In order to receive the signal generated by usrp e110, I implemented an FM receiver flow graph on usrp e110 which is attached below and I used an VERT900 Antenna, described in this link:   https://www.ettus.com/product/details/VERT900  .

But I still have noise generated by usrp e110.

Have you an idea if there is a non suitable parameter on the flow graph ?

Thanks in advance

Best regards,

Wafa HAJ HMIDA

2014-06-12 12:33 GMT+02:00 Mike Jameson <address@hidden>:

The SBX has a frequency range of 400MHz to 4.4GHZ which is why you cannot tune to broadcast FM stations between 88-108MHz:

https://www.ettus.com/product/details/SBX

Mike

--
Mike Jameson M0MIK BSc MIET
Email: address@hidden
Web: http://scanoo.com

On Thu, Jun 12, 2014 at 11:14 AM, Wafa Elhajhmida via USRP-users <address@hidden> wrote:

Hi everybody,

I'm trying to implement FM receiver on usrp e110. The daugtherboard used is SBX Board Rev 5.1.

As a result, I got only noise, I wasn't able to hear the local station at 103.5 Mhz.

And I got this error:

UHD Warning:

    The hardware does not support the requested RX frequency:

    Target frequency: 103.500000 MHz

    Actual frequency: 423.500000 MHz

>>> gr_fir_ccf: using armv7_a

>>> gr_fir_fff: using armv7_a

aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUOaUaUaUOaUaUaUaUaUaUaUaUaUaUaUaUaUaU

I attached a screenshot of FM receiver 's GRC.

Can you help me to detect if there are some parameters which are wrong ? 

Best regards,

Wafa HAJ HMIDA

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fm receiver with NI PXIe-5673.jpg
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