> Well these guys claim the remote digital control of PTT is possible! > > http://rpf-communications.blogspot.com/2008/11/breakthrough-with-icom-data-mics.html
Appologies for thread-digging, but I'd really like to know the answer on this and don't have the spare cash to purchase a DataMic at the moment. It would appear that the DataMics contain a small micro which can communication with the rig to perform several functions. From the limited information available on the internet this may be CI-V, which would mean that a PC (or other micro) could 'control' the rig in a limited fashion. For a HM-98, HM-133 the mic has a 8pin RJ45: pin 1 - +8V pin 7 - GND pin 8 - data out For the HM-75A the mic has two connectors. Mic: tip - MIC mid - OPT (5V) ring - GND Speaker: tip - AF Out mid - CLONE (Data in/out) ring - GND If one of you guys has the ability to rig up the mic to a scope (or C-IV interface) and post a capture, we might just be able to decode what these are doing... Cheers, Simon VA6SDW
