From: Ashhar Farhan
To: BITX20@groups.io
Sent: Saturday, June 3, 2017 2:50 PM
Subject: Re: [BITX20] CW on Allard's Code v1.13
Post No ? #27588
To: BITX20@groups.io
Sent: Saturday, June 3, 2017 2:50 PM
Subject: Re: [BITX20] CW on Allard's Code v1.13
Post No ? #27588
I envisaged the same line to be used for straight and paddle keys. here is how :
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1. the morse line is analog input pulled high by an external resistor of 4.7K from 5 volts.
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2. the straight key is connected normally. the paddle is connected such that the dot switch has a 4.7K resistor in series and the ?the dash switch has ?a 10K resistor in series
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3. when the straight key is pressed, the analog line dips to below 0.5v
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4. when the dot is pressed, the 4.7K resistor shorts to ground, the voltage at analog input is 2.5v or thereabouts.
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5. when the dash is pressed, the 10K resistor shorts to ground, the voltage at analog input is now 3.75 or so.
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6. when both the paddles are pressed (Iambic), then the voltage is 1.75?
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This is the keyer logic that i am building on ubitx too.
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- f
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