Allison you should check your 4.7k resistor solder connections you should be measuring 5vdc on both sides and ground. Pin 3 is the 5vdc supply and the 4.7k resistor is setting pin 2 high. Do you have the CW jack wired up. If so what is plugged into it, that could be what is drawing low enough to switch into transmit.
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On May 19, 2018, at 22:56, ajparent1/KB1GMX <
kb1gmx@...> wrote:
Odd issue popped up while working with the transmitter.
Radio went to CW and stayed keyed.? Tried power of and suoon as it booted it went CW and keyed.
This is odd as the blue, purple, and green wires are not even in the connector as i"m not using the key.
The 4.7K resistor is in place on the green/blue connection pair.
If I measure pin2 (blue) to ground I get .1V save for ther is no connection and it ohms open (power off).
If I connect blue to +5 it stops but the pin is pulling down 25ma!
No ESD likely strap and conductive pad in use.
If I didn't know better id swear the input self reprogrammed as an output!
I may have to do the programing dance on this before pulling the nano.
Firmware is? factory v0.20 on startup.
Any thoughts?
Allison
Skip Davis