the voltage on the tuning pin varies from 0V to 1.8V
what's supposed to happen is the voltage is supposed to rise and as it's rising the frequency of the varicap circuit is changing affecting the LO of the radio front end...
What's supposed to happen is as soon as a good signal is found it's supposed to stop increasing the voltage.
I figured that it might not be finding any good stations and thus always statying in the 0V state... but perhaps then it would always be in the 1.8V state rather.
I'll poke around some more tommorow when i go back to the lab.
Thanks,
Blake