Support for CALLSIGN

[gullradriel]

As some apps like Recon or Mic are acting as HamRadio software, we would like to add a CALLSIGN support in the firmware.

It could be per app or global, but the API to emit a callsign should be common to all apps.

[NotherNgineer]

Implementation wise, first I would suggest adding a Call Sign to the Settings menu, where the operator could enter or view a Ham Radio call sign to be stored in Pmem. If the Morse Code app is being used to transmit, an checkbox could be added to the Morse Code app to append the call sign to transmissions (and would automatically convert the text string in Pmem to morse code). A similar checkbox could be added to the Microphone app (either transmitting the call sign in Morse Code or transmitting an optional WAV file stored on the SD card).

Some notes regarding call sign transmission from the FCC regulations in the USA, just FYI:

§97.119:
(a) Each amateur station, except a space station or telecommand station, must transmit its assigned call sign on its transmitting channel at the end of each communication, and at least every 10 minutes during a communication, for the purpose of clearly making the source of the transmissions from the station known to those receiving the transmissions. No station may transmit unidentified communications or signals, or transmit as the station call sign, any call sign not authorized to the station.

(b) The call sign must be transmitted with an emission authorized for the transmitting channel in one of the following ways:
(1) By a CW emission. When keyed by an automatic device used only for identification, the speed must not exceed 20 words per minute;
(2) By a phone emission in the English language. Use of a phonetic alphabet as an aid for correct station identification is encouraged;
(3) By a RTTY emission using a specified digital code when all or part of the communications are transmitted by a RTTY or data emission;
(4) By an image emission conforming to the applicable transmission standards, either color or monochrome, of §73.682(a) of the FCC Rules when all or part of the communications are transmitted in the same image emission

(Identifying your station using CW is always permitted on any band while using any mode.)