[Discuss-gnuradio] Correct idiom for frequency-setting when you don't have a tuner-type daughtercard?

[Marcus Leech]

I'm modifying my radio astronomy applications to support other than 
tuner-type daughtercards.

Is this roughly correct for supporting such cards (BASIC_RX is the only 
one I know of)?

       #
       # Everything except BASIC_RX should support usrp.tune()
       #
       if not (self.cardtype == usrp_dbid.BASIC_RX):
           r = usrp.tune(self.u, 0, self.subdev, target_freq)
       else:
           r = self.u.set_rx_freq(0, target_freq)
           f = self.u.rx_freq(0)
           if (abs(f-target_freq) > 2.0e3:
               r = 0