Hey Andrew!
The Prescott Node #3182 doesn't require a control code to use it, so all you need to do is follow the procedure in the first post:
http://expeditionportal.com/forum/showpost.php?p=106011&postcount=1
and you are connected to the node!
If I'm acting as net control, the node will already be on, so you should be able to join in without doing anything.
The Grand Canyon node doesn't allow connections to a reflector, so your only option is to get a good signal to the Prescott repeater. I'd bet your line of site from Mt. Elden or up the Snow Bowl road. I get real good reception from all four of the ARA (
http://www.w7ara.org/Web/) repeaters on Elden from almost anywhere in the Prescott area.
On a side note, the 147.410 repeater on Elden is now connected to Mt Ord, Pinal Mt., and Greens Peak east of Show Low to form the Rim Link that covers from Casa Grande to Prescott, to the Navajo Res, and into western Tuscon. That's a huge chunk of AZ!
Mark