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I think I must have busted the arduino? I went through it a few more times with a muktimeter. Every thing seems in order.
I thought it might be the Arduino. So I updated the firmware on it expectj g that to fail. It worked and even fixed my problem with the key.
Now I only have one problem. Now the rotary encoder doesnt work! The push button does, but not the rotation. Super weird. I ordered 3 more arduino nanos.
Any thing else jump out at you?
On Sep 25, 2020, at 3:30 PM, Evan Hand <elhandjr@...
My first thought is to check the mic and key connections. I have had similar issues with 3.5mm plugs that being pushed in all the way. One of my key paddles has that issue, and I must constantly check that it is pushed in all the way.
I would verify the operation of the key input. That is the line that needs the 4.7kohm resistor. Check with a voltmeter after connecting a dummy load, or disconnecting the power to the power amp finals (the middle connector, brown wire, on the 3 pin header on the main board).
Did you by chance get one of the AmatuerRadioKits cases? If so, I would verify the soldering on the front PCB, making sure that all of the 3.5mm jacks are soldered correctly, and no shorts. You will also need another 3 pin header plug to separate the PA power, as the instructions for that case has you connect them together at the back PCB.
In any case, I think that you have a wiring issue that you need to resolve. With the situation that you describe, even a short blip on the transmit key can cause the Nano to lock up due to RF feedback when you do not have a matched load. Before breaking out the scope, I would attach a dummy load and verify that it operates properly.
A good 20 watt low-cost dummy load can be ordered from QRP-Labs for $8.50 plus shippling. Alternates can be had from Amazon, though without the power breakout circuit.
Hope this helps.