Forum: GNU Radio getting noise for FM receiver with usrp e110 ?

7e7e910b5d3a6a3d743b5984fb57cc54?d=identicon&s=25 Wafa E. (wafa_e)
on 2014-06-12 12:16
(Received via mailing list)
Attachment: fm-receiver.JPG (700 KB)
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
C2ed5433862330f8d76de8eb807851ca?d=identicon&s=25 Mike Jameson (Guest)
on 2014-06-12 12:35
(Received via mailing list)
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: mike@scanoo.com
Web: http://scanoo.com


On Thu, Jun 12, 2014 at 11:14 AM, Wafa Elhajhmida via USRP-users <
558c40b97bd1af8d912424757714bda9?d=identicon&s=25 Marcus D. Leech (Guest)
on 2014-06-12 14:17
(Received via mailing list)
On 06/12/2014 06:14 AM, Wafa Elhajhmida wrote:
> *    The hardware does not support the requested RX frequency:*
>
> Best regards,
>
> Wafa HAJ HMIDA
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Two issues:

The SBX doesn't support that frequency.

The audio subsystem on E110 doesn't support a sample rate of 96k
C042c0e4f1d7e6158d9d5d8288a50a99?d=identicon&s=25 Hariharan G. (hariharan_g)
on 2014-06-12 17:53
I just received my B200 and facing the same issue. The B200 supports
70Mhz upwards, wonder why I am just getting noise. There is no error
while running it.

Anyone tried this with B200?

Thanks
Hari


Marcus D. Leech wrote in post #1149608:
> On 06/12/2014 06:14 AM, Wafa Elhajhmida wrote:
>> *    The hardware does not support the requested RX frequency:*
>>
>> Best regards,
>>
>> Wafa HAJ HMIDA
>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> Two issues:
>
> The SBX doesn't support that frequency.
>
> The audio subsystem on E110 doesn't support a sample rate of 96k
7e7e910b5d3a6a3d743b5984fb57cc54?d=identicon&s=25 Wafa E. (wafa_e)
on 2014-06-16 11:22
(Received via mailing list)
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 <mike@scanoo.com>:
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