J.B You may find the firmware in the 2004 model is different.
I have two 04J41 has P10792E. 04J44 has P10792F. All the rest of mine starting at 05C10 have P10792M.
You may find the way RF signals are handled by the 2004 is slightly different. With a HR12 Palm Pad that sends the RF signal three times. My oldest two process it as one RF event. The newer ones process it as two RF events.
I haven't checked this yet, but thanks for passing along the info.
I'll make sure I keep it in mind as not to think there is an issue with it if I put it to use later on.
I only did a quick test with each unit I received to ensure it was picked up and that it would transmit and receive commands.
I've used several to troubleshoot some issues I've had and ensure it wasn't the result of a faulty CM15a.
I'm currently using a 2006 model that I've done both a receive and transmit antenna mod on.
I've had two different 3 watt models, one with polarized plugs and the other having matching sized prongs.
I assume the older 3 watt versions have the different firmware.