?
The link is an article on the history of electronic keyers.? It is quite lengthy but if you read it you will learn a lot.? It seems that with each major product introduction a new subtle or not so subtle difference in timing was also introduced.
?
From the article, the major difference between mode A and B is that mode B polls the opposite paddle for a pressed state during the sending of the element and the following element space.? Whereas mode A polls the opposite paddle for a changed of state from not pressed to pressed.? This difference is what prevents mode A from not sending an extra un-keyed element that turns letter K's into C's.
?
The current Zbitx code for mode A polls for a pressed state of the opposite paddle same as mode B during the carrier on? period and does not poll at all during the element carrier off period.?? It would be interesting if some of the users who say it works or say it doesn't work would report what mode they use.? I can't see that a Mode A user would have a good time at all with it working mostly as mode B.
?
The mode B code still has the bug I pointed out twice that will change a DIT paddle contact to sending an unwanted DAH if the paddle contract is made during the carrier off period.
?
? ? ? ? if (cw_mode == CW_IAMBICB){
? ? ? ? ? ? if (cw_next_symbol == CW_IDLE && cw_last_symbol == CW_DOT && (symbol_now & CW_DASH)){
? ? ? ? ? ? ? ? cw_next_symbol = CW_DASH;
? ? ? ? ? ? }
? ? ? ? ? ? if (cw_next_symbol == CW_IDLE && cw_last_symbol == CW_DASH && (symbol_now & CW_DOT)){
? ? ? ? ? ? ? ? cw_next_symbol = CW_DASH;
? ? ? ? ? ? }
? ? ? ? }
?
Shirley Dulcey KE1L
