Strictly from a noise standpoint alone it can be said that an ODFM receiver is more sensitive
The noise as received by a wide band receiver is much more as a narrow band receiver If we make it even narrow enough we can even detect signals below the natural noise This is how Radio Astronomy works, we detect far away space probes or how some radio amateurs (hams) communicate on very high or extremely low frequency bands with very small power and digital modulation techniques. Extremely narrow band receivers can be made by replacing the conventional filters with digital signal processing . So filtering in software! In a ODFM receiver we filter often the hundreds of carriers each with such a digital signal processor Think it as hundreds of small band receivers on each carrier in parallel.. In reality we have one small band receiver what scans (samples) each carrier with it's modulation very fast Maybe this very simplistic explanation helps.. Bob Tenty VE3TOK -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
