[Discuss-gnuradio] Simple question about AM Transmission with GNUradio/USRP

[Alex Gross]

Suppose I have a dial tone (350, 440 Hz) and I want to broadcast it on 
an AM radio station whose center frequency is X using the USRP basic TX 
daughter card.

Is there a code snippet I can look at which would describe this?

How do I select the appropriate sampling rate, if_decim, if_rate, etc.? 
E.g. if I choose a sampling_rate of 16 kHz to generate the sine waves, 
what do I need to set my usrp_tx_interp rate to in order to achieve a 
corresponding output? Do I need to further interpolate or decimate this 
signal before passing it to the USRP? Also, should I be using 
complex_to_float() or something else?

Now, suppose I want to broadcast to N AM radio stations whose center 
frequencies are X + [x1, x2, x3 ... xn]. What changes? Do I use the 
freq_xlating_filter with the offset equal to [x1...xn]? If so, what 
parameters do I provide?


I've looked through the NBFM files, but they're more complicated than 
what I want at this point.



Thanks,

--Alex