Hi Jamie,

There are plenty of radio's that will do exactly what you want it to do.

Take a look at the following below, the firstvendor is in the UK and the second is in California, USA. Both have a good selection of transmitters that have such options available.

http://www.cornwallmodelboats.co.uk/...o_systems.html

and Here:

http://www.harbormodels.com/

-Rich.