Even though I have found the official technical specs ( page with overview and link to specs) for the AMPS cellular system, and even an open-source implementation that runs on a Linux computer with external FM transmitters/receivers, I think this is way beyond my skill level (RF/antenna circuits, can't find off-the-shelf FM transceiver chips that support 800MHz band + Manchester encoding, I don't know audio processing circuits, etc.). This would be the ultimate in preserving ALL original functionality of the phone, but would be the most complicated solution technically.
#ZTREEWIN FREE LICENSE BLUETOOTH#
The perfect solution: emulate an analog cellular base station that connects directly to the antenna port of the transceiver and translates between analog cellular commands and Bluetooth headset commands.With enough persistence in reverse-engineering and emulating, I could hypothetically support most/all of the phone's original functionality (speed dial, etc.). With this approach, I could hypothetically intercept attempts to dial out from the handset, redirect them to Bluetooth commands, then fake appropriate responses to the handset so that it believes it is now "in a call". Find a way to intercept more complex communication between the handset and transceiver and build a custom Bluetooth adapter with my own programming that interprets commands from the handset and transceiver and chooses whether to pass commands through unaltered, or translate them to/from Bluetooth handset profile commands.Can't actually dial out, and the phone won't ring for incoming calls, but I could at least use the car phone handset as a glorified speaker and microphone during calls. The phone will still "work" as original, but the Bluetooth functionality would be completely separate and "in parallel" with original phone behavior. Find a way to tap into the microphone and speaker audio signals of the handset and non-destructively wire up an off-the-shelf Bluetooth headset.I quickly dismissed this option because I want to preserve the original functionality and display of the phone as much as possible. Gut the internals of the handset and hack an off-the-shelf Bluetooth headset into it.Some approaches I have considered as possibilities: The general goal: I want to be able to use the obsolete car phone to make/receive phone calls, of course! Now for the goals of the project and the approach I'm taking.
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