It can be used to output DTMF and SelCall sequences which are used by telephone systems and radio-telecommunication hardware. The software is written in J2ME so if you have a cell phone that can ...
The project uses a DRA818 VHF/UHF transceiver plugged into a low-pass filter combined with a hardware DTMF decoder ... [KE4FOX] also etched his own PCB, using the PCB toner transfer method ...
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