While the process should be similar for almost all RF thermometers, the specific model I'm hacking is a "Maverick RediChek Remote Wireless Smoker Thermometer Model ET-73". It can be purchased from my Amazon store here: http://astore.amazon.com/johspro-20/detail/B0000DIU49
This is functionally a fantastic remote thermometer. It has two temperature probes (one for food, one for smoker) with completely independent alarm settings. It's consistent downfall (as you may find from numerous user reviews) is range. Maverick claims 100' which I have verified to be true providing both the transmitter and receiver are outside and in line-of-sight of each other. As soon as you step in the house (or even behind a tree when far away) the signal is either blocked or range is drastically reduced. Other than that, most people seem to like it. This hack solves that problem.
Hopefully this will help some of you out. From start to finish this took me about 30 minutes. I would expect it to take 1 - 2 hrs if you're not familiar with the parts or basic electronics hacking.
Note: For those of you already familiar with "rev 1" of this Instructable, "rev 2" adds the following:
- Found and implemented ideal antenna length - 6.7" (based on whitepaper found here)
- Added antenna tube cover to protect exposed wire (and add to overall durability)
- General clean-up of the overall Instructable