On Fri, 2007-06-22 at 10:32 -0700, Johnathan Corgan wrote: > Lee Patton wrote: > > > I want to transmit and receive in the 144 MHz (2m) band, but there isn't > > a daughterboard available for that band. 144 MHz will alias to 16 MHz > > with a 64 MHz sampling frequency. So, sub-nyquist sampling will work on > > receive. However, I'm not sure how to achieve 144 MHz on transmit. (By > > the way, I need to be coherent between transmit and recieve.) Any advice > > on the simplest course of action? > > The output of the DAC is a stair-step waveform that is rich in harmonic > content. Normally these harmonics are removed by a low-pass > reconstruction filter. The BasicTX card does not have one, however, > which allows you to transmit at 16 MHz, then bandpass filter > (externally) the 9th harmonic to get 144 MHz. Your output power will be > much lower, of course, than the fundamental.
Thanks, Johnathan! That is a really interesting idea. I'll look into it. -Lee _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
