[Elecraft] re: K3: Amp keyed during power up

wayne burdick n6kr at elecraft.com
Sun Oct 5 13:38:09 EDT 2008


Dave,

> Am I the only one who suffers from the K3 earthing the "key out" 
> terminal while it does its "clunkety klunk" power up sequence?

You're right: KEY OUT is going low for a significant time on power-up 
(about 3 seconds according to my measurements). There's no RF, but we 
definitely didn't intend to assert this line.

I just changed the firmware so that KEY OUT goes low for the minimum 
possible time on power-up, about 50 milliseconds. This reflects the 
start-up time of the microcontroller.

Thanks for catching this. The change will be in the next beta-test 
release.

73,
Wayne
N6KR

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