Re: [Discuss-gnuradio] Residual Frequency?

[Eric Blossom]

On Fri, Apr 18, 2008 at 03:38:37PM -0400, Wireless Monster wrote:
> Hi All,
> 
> I am trying to send a GSM modulated signal using the USRP and the RFX900
> board using the 'tune' function as in the provided usrp examples:
> 
> r = self.u.tune(self.subdev._which, self.subdev, target_freq)
> 
> The desired frequency is 925.6MHz, and I am getting a -381.47m
> residual_frequency as shown below.

Note that that's 381.47 milli Hz == 0.381 Hz.  There's nothing you
have to do about it.

> What will be the best way to correct that, so I get the signal modulated to
> the desired frequency?
> 
> Thanks in advance to all for your help!
> 
> ---8<----
> 
> Using TX d'board A: Flex 900 Tx MIMO B
> r.baseband_freq = 930M
> r.dxc_freq      = -4.4M
> r.residual_freq = -381.47m
> r.inverted      = False

Eric