Arif Deshmukh wrote:
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for world wide contacts and morse code signal can be heard during thunder storm but you can not hear AM(MW, SW) signal.

what kinda modulation MORSE CODE uses. as far as my knowledge is concern. morse code is a coding scheme using dot and dash not an modulation scheme like AM,PM FM etc.

there are many circuits published named code practice oscilator and receiver. go for them.

Bye

abhishek