Carl,
I'm not sure what you mean by "not pick up radio frequencies." I will assume that you mean show the frequencies for the selected airport. After you select the airport you need to go to the frequency page, 3 clicks right on the small right knob. This will show the frequencies for the selected airport. To move a frequency into the comm side, press the small right knob, a highlighted cursor will appear on the screen that can be moved by turning the large right knob. When you have selected the one you want, press "enter" and it will appear in the standby window of the comm.
A very handy way to train on the 430 is to download the free simulator on the Garmin website. Unlike the docking station, you can "fly" the simulator and see how the functions work in motion.
http://www8.garmin.com/support/downl...ls.jsp?id=3528
There is a lot to learn about the 430/530 units. I suggest getting one of the training DVDs offered by Jeppesen or King.
John Clark
RV8 N18U "Sunshine"
KSBA