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did you check/adjust the contact spacing?........... I think it is set to ZERO for shipping purposes,... there has to be a gap


BTW, contrary to the name, this is NOT an Iambic keyer, it is a dual lever paddle.


you didn't mention it, but,does the 857 have a built in keyer (I dunno). if not, then you do need a keyer between the paddle and the radio.


https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&cad=rja&uact=8&ved=0ahUKEwibp6eLquTNAhXMTSYKHZFiDQAQFgg8MAY&url=http://www.mtechnologies.com/misc/mfj564.pdf&usg=AFQjCNFupqIL-fYK75OtWcyBPpJ02DVOlw