[Elecraft] k3 key out jack

[Don Wilhelm]

Shel,

Keyout is on RF Board sheet 1.
Is your problem only from the internal keyer?  In other words, does it 
work when you use a hand key or computer keying?

If also a problem from a hand key or computer keying, then what is the 
DC voltage at the gate of Q3 during keydown - should be almost 12 volts.
Do you have 7 volts on the gate of Q5 during receive?

The Keyout is a simple circuit consisting only of Q3 and Q5 - when in 
transmit, the 7R input should go to near zero, and that should make the 
gate of Q3 go to a high voltage (almost 12 volts) - that is all there is 
to it.

73,
Don W3FPR



On 3/8/2018 4:42 PM, Shel Sherman wrote:
> 
> 
> Sent from Mail for Windows 10
> My K3 does not pull the key out line to ground when pulsed by the internal keyer, I need some help in tracing the circuit on a schematic.
> 
> Shel Sherman  WO0C
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