Parameters for USRP (motherboard only) FM receiver

Hi,

I’m trying to setup the USRP to receive and demodulate an FM signal at
175kHz. I have based my code on the wfm_rcv… examples, but I always
get a “no suitable daughterboard found” error. I do not understand all
of the parameters that I am setting on the USRP so I was wondering if
anyone could explain them or point me to a resource on this.

Basically, I know that I want the frequency to be 175kHz and I have
gotten this to work with transmission, so I assume that’s valid. I am
more or less lost on decimation, interpolation etc.

Any help is appreciated.

-Shane

Hi Shane,

On 6/19/07, Shane C. [email protected] wrote:

Hi,

I’m trying to setup the USRP to receive and demodulate an FM signal at
175kHz. I have based my code on the wfm_rcv… examples, but I always
get a “no suitable daughterboard found” error. I do not understand all
of the parameters that I am setting on the USRP so I was wondering if
anyone could explain them or point me to a resource on this.

Which daughterboard are you using?

Basically, I know that I want the frequency to be 175kHz and I have

gotten this to work with transmission, so I assume that’s valid. I am
more or less lost on decimation, interpolation etc.

Any help is appreciated.

-Shane

~Tarun

On 6/19/07, Tarun T. [email protected] wrote:

~Tarun


I am using the DBSRX board. I have actually gotten the receiver
working more or less through trial and error, but I have yet to do the
FM demodulation in Python.

I put something together in GRC that uses USRP -> NBFM receive ->
file_sink, but I just accepted the default values as I do not
understand the meaning of the NBFM block’s parameters.

-Shane

2007/6/19, Shane C. [email protected]:

I am using the DBSRX board. I have actually gotten the receiver
working more or less through trial and error, but I have yet to do the
FM demodulation in Python.

Did you read the specifications for the DBSRX board? The frequency
range of this daughter board is approx. 900 to 2400 MHz, which is
outside the signal you are trying to receive.

Regards,


Trond D.

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