I think you can make low-efficiency inductive coupling with very few components and very small. Could even have a ferrite stick out a bit. No reason why once you epoxy it back up that it needs to be exactly the same shape :)
Yes, this is the G4, and we're told it's good only for 6 months. Works out about $5/day just for the battery. Very expensive battery!
I have a couple of TI evaluation boards on order as well to see if I can hook together another receiver - in the form of a USB dongle with the CC 2511 in it. Dexcom appears to be using a stock TI chipset and network stack (SimpliciTI). It's about a $20 kit, so they are making an enormous profit on the transmitter.
Ah, okay - thx for the link. The layout is complete different compared to the 7+. It has a double board with the batteries between the plates. The only way to change the batteries will be sideways. The RF signal that comes from the cc2511 is encrypted for sure.
Hi, my understanding is it's not encrypted. Just raw data, so anything reading it will need to calibrate like the receiver does (and therefore will also require the calibration readings). There's a mine of information in the dexcom patents and patent applications.
Great news! How many G4 transmitters went into the trash before you succeeded?
(one of them may have been mine)
I can't wait to read the tutorial. I am not that handy, but hopefully this will be in my skill range.
so i'm about to try replacing the battery in G4 tranmitter. Is the layout really that different from the Seven? Thanks for doing this. It's nice to be able to do things like this ourselves. Several years ago i put instructions on line showing how to replace the display in the MM508 pump.
-wayne
Since it's relatively easy to replace the batteries, it seems a shame that Dexcom didn't design their transmitter to allow replacement of the batteries. Has anyone heard whatever they are saying as to why it's not designed to be replaceable?
Abbotts first Navigator 1.0 and 1.5 was designed that way. But they moved to Dexcom's philosophy with the recent Navigator 2.0, too. They are all companys - medical companys with one goal - making a huge profit.
