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wiring up a cw paddle ref 54899 #bitx20

Kelly Mabry
 

Ok, so i studied the thread and the ubitx.net website to wire up my vibroplex paddle for the ubitx.  I am using a sunil amateurradiokits.in case and front panel board. I have used a 10k and a 2.18k resistor as part of my voltage  divider.  Using 3.5 mm stereo plug, and when i plug the paddle in and try to send, only the dits work, no dashes. I measure the resistance  between the paddle and tip, and paddle and ring and get the expected 2.18k and 10k resistances. It's a new paddle.  Confused. 

73, 
Kelly K5AID 

Tom, wb6b
 

Hi,

If you are not already, you may want to try the CEC firmware. I believe that software allows you to adjust for the actual voltages seen on the analog input pin for the dots and dashes. There could be considerable variation in the voltages seen with a random selection of Nano boards. 

Assuming the issue in not something to do with wiring, you could experiment with a variable resistor (pot) on the key input and see what values produce dots and dashes, and adjust your resistors accordingly.

Tom, wb6b

Kelly Mabry
 

Hi Tom, i am using v1.12 of CEC fw. I will try to adjust my dash resistor. I think i have a 10k pot lying around somewhere...Thanks!!
73, Kelly K5AID 

Kelly Mabry
 

The same result using a pot to vary dahs... no effect.  No dahs, at all. Im down a power supply so no other rig to compare to at this time.

73, 
Kelly K5AID 

Tom, wb6b
 

Interesting. Try measuring the voltage on the keyer analog input pin to the Arduino. If it doesn't go up significantly when the resistance is increased, then try an external pull-up (maybe 10k) resistor from 5 volts to the keyer's analog input pin to the Nano. It could be the Nano is outside of specification and its internal pull-up is too weak.

If the voltage does go up, I'm not sure what the answer is.

Another person had a similar problem about six months ago. He went through the same tests, initially with no results, but finally solved it. Maybe, you will hear from him or could try searching the messages on the list. If I think of good search keywords, I'll reply again.

Tom, wb6b

Sam Tedesco
 

There was a recent post about having to cut a trace on the front panel board for paddles. 

Kelly Mabry
 

Yes Sam, Sunil told me the following..The resistor need to be mounted on PCB and a cut is required in one track.

I contacted him due to the circuit board is in his Nextion case kit.

Will do the mod later today

73,
Kelly K5AID 

Sam Tedesco
 

Perfect! I left my front panel as is and brought the dividers to the rear auxiliary board. Key in the front, paddles in the rear.

Mike Short
 

If you reverse the wiring on your paddle do you get dahs?

Kelly Mabry
 

No.  i am currently working  on the fix. More info soon.
73,
Kelly K5AID 

Kelly Mabry
 

Update!! Success! But not without a casualty. I cut the speaker trace by accident, but i wired point to point to fix it. So now all i need do is plug the keyer paddle in and go!  

Note this is needed to be done only if you are using one of the amateurradiokits.in cases. This was good practice for the AGC from kit-projects.com but i'm scared to install it. Lol. I shook so much and i only have a cheap dremel knock off with one speed....high! But the switch is in my case, all i need to figure out is "how to drop it in"

73 for now...

Kelly K5AID