Friday, July 13, 2012

MorseDec tone recognition troubles on Palm Paddle IR (SOLVED)

Trouble :
some problems with tone recognition of my Palm Paddle IR:
Sound generator works: generator.m4a
Palm paddle does not work: PalmPaddle.m4a


Generator use a 680 Hz tone
and Palm Paddle a 2340 Hz tone.
Generally CW tone range in HF is between 500 and 1000 Hz (you can try listening with your radio in CW mode)
so I decide to limit the input from 250 Hz to 1300 Hz.
This is not a problem, but a choice to make more comfortable to tune cw signals.

Further check and Solution (THANKS Holger!):
I've experimented a bit and looked at the spectrograms of the buzzer.
Naturally, the palm piezo has no clear sinus wave.
The choosen frequency occurs only as a weak side line.
This seems to be the reason why your software did not respond.
The microphone of the headset brings this weak signal in now.
73 de Holger / DO7CW