Added Roger Beep

Added Roger Beep (NASA style "Quindar Tone" as used in Apollo missions).
PTTsense, RXTX and CWcarrier mods must be installed for this feature to work.
Press Function Button 7 times to toggle this function on/off.

bug fix

Fixed a bug that the PTTsense mod was not reliably detected on some radios. As a result, CW operation was disabled even when the mod was installed.

prevent out-of-band transmission

v1.28

• prevention of out-of-band transmission depending on ITU region (tks Akira JJ1EPE)
• allow the Arduino inputs to settle for 100 ms after power on (tks Ion VA3NOI)

interrupts are only enabled when PTTsense mod is present

• Slightly revised the code so that interrupts are only enabled when the PTTsense mod is installed

a few small improvements

1.27.6

• improved the code so that the si5351 does not keep receiving tuning updates once the frequency has reached the upper or lower limit
• corrected a bug that when semiQSK is ON, switching between modes did not work correctly for CWL/CWU.
• increased the default delay time for the Function Button for easier operation
• updated the instructions for the CW-CARRIER mod: Advise to use a 4.7K resistor instead of 10K so as to ensure full output power in CW

added user parameter for FAST TUNE step delay

line 33: Added the ability to set the step delay time for fast tuning (when the tuning pot is at the upper/lower limit) (tks Bob, N4FV)

show callsign on display

• Line 32: Added the ability to specify text (e.g. your callsign) on the second line of the LCD when it would otherwise be blank (tks Richard, VE3YSH).
• some code clean up

bug correction

• corrected the si5351 25mhz crystal load capacitance setting (tks Daniel KB3MUN)
• changed the initial calibration value to 180 ppm

bug correction

Fixed a bug that with short QSK delay time, the radio did not return from CW to SSB mode when the PTT is keyed manually.

some bug corrections

• fixed a bug that the spurious carrier burst was not suppressed in SPLIT mode
• In semiQSK mode, the initial CW element is now delayed by 65ms (to prevent the carrier burst), instead of canceled
• fixed a bug that the radio did not reliably switch from LSB to CWL in semiQSK mode
• fixed a bug that the display got messed up when the VFO is above 10 MHz