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CW with new build uBITX
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Have just wired my new uBITX 4.3. Installed the 4k7 pullup resistor at CW input and pulled tehn the CW port A6 to GND - nothing. Because it is a ADC port I put a 10k pot between GND an 4k7 and got dits, ditdahs and dahs. Nice. So I installed some resistors and mastered some QSOs with the paddle. But cannot use a straigth key nor one of my bugs. Need a coninuous CW tone also for tuning. Any advice?
73 de Matthias, DD7NT |
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hello, i have same problem, but in setting? have? choice not iamba? but hand key.. if i remember right... for me are a new world? after many? qso on? ssb? or digital mode..
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hope?? you can? find? solution.?? tnx? for all friend have help me? about? other? problem. best '73 from north italy de in3izq danilo Il 27/08/2018 19.18, Matthias Zwoch ha scritto:
Have just wired my new uBITX 4.3. Installed the 4k7 pullup resistor at CW input and pulled tehn the CW port A6 to GND - nothing. Because it is a ADC port I put a 10k pot between GND an 4k7 and got dits, ditdahs and dahs. Nice. So I installed some resistors and mastered some QSOs with the paddle. But cannot use a straigth key nor one of my bugs. Need a coninuous CW tone also for tuning. Any advice? |
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Am 27.08.2018 um 19:54 schrieb Ben Holmes:
My guess would be to follow this schematic... and put in a second jack. You could also put (as I plan to) put a momentary push button across this (for when you don't have your key)Hello Ben, I followed this schematic. But there is only one Pin (A6) for CW input. And this port can be set between 0..5V (=4k7 to GND..4k7 left open). I tested the whole range from 0..5V I got dit, dahs and ditdahs but nowhere a continuous tone. Maybe the ADC is a bit noisy and starts not with null. If the software reads the ADC and gives a coninuous tone only if (ADC == 0) then it will never work for some A328. Will get the sourcecode and look at it. 73 Matthias, DD7NT |
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In that case, I'm at a loss too!
As I don't have mine build yet, I can't go any further with this, and my Arduino coding skills are just a tad better than my ability to hold my breath under water for more than ten minutes. I just recall seeing the schematic a few days ago as I was ordering some better jacks, and thought perhaps you might have missed seeing it. If it still doesn't work, then I throw up my hands and beg for someone further along on this project to jump in and help! 73 Ben Holmes, K6QV |
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Matthias DD7NT
You can check the CW pin input to its ADC by connecting a reasonably high impedance voltmeter to the pin and then reading voltage while sending (1) straight key closed, (2) dit closed, and (3) dah closed.? Each of these should give a different voltage to the CW input ADC pin.? The ADC reads these voltages and the Arduino decides what to send if these voltages are lower than the +5V supply.? There is some small range for each voltage to allow for resistor tolerance.? Closure of the straight key should show zero volts on the CW input. Closure of the dah paddle should show 3.4 volts on the CW input. Closure of the dit paddle should show 1.6 volts on the CW input. Voltage readings are approximate and there is some small range allowed to compensate for that. <> Arv? K7HKL _._ |
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You can get rid of the CW resistor divider kludge.? Look at software at On August 27, 2018 at 3:23 PM Arv Evans <arvid.evans@...> wrote: |
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