The slow boat from China was REALLY slow! Actually, the module was lost in transit the first time. Anyway, it finally arrived and I have been playing with it a bit. Using the RTLSDR software, it is possible to tune the module to receive anything from 60MHz to 2GHz+ (depending on hardware). Not only can it tune a single band, it can actually visualize a large band to show what frequencies are being used.
I tested by tuning in a couple radio stations. While it works ok with the cheapo included antena for a couple stronger stations, it isn't good sound. I purchased a PAL to F-connector and used an 18" whip (stripped coax) and could get a stronger signal, so obviously antennas matter.
Here's where I need help. I tuned to 310MHz and clicked some buttons on my HR12 palm pad. I could see spikes on the graph, but they were at 310.2 and a weaker one at around 309.8. How critical is the 310MHz to the CM15A? I'm planning on testing with my actual antenna run to see how things look to the CM15A, but if someone with more knowledge could chime in, that would be great!