Re: [Elecraft] K3 Key Out Jack Not Working

Bob Wilson, N6TV

The KEY OUT jack GROUNDS the center pin, whereas a shorted phono plug simply completes the DC relay circuit between shield and center (without grounding it).  That's probably why it doesn't work.

Bob, N6TV

On Fri, Dec 27, 2019 at 3:14 PM N4ZR <n4zr@...> wrote:
I'm trying to set things up so that I can disconnect my 160M transmit
antenna whenever I'm receiving, to prevent noise coupling into my RX
antenna.  My thought is to use the Key Out jack on the K3 to control DC
to a relay at the base of the antenna,  floating the base of the
inverted L unless PTT is asserted.  The lashup is complete, and works
when I short the phono plug manually, but not when I plug it into the
KEY OUT jack and energize PTT.

I'm hoping it's just a menu issue, but my manual doesn't show any menu
options affecting the Key Out Jack.  I have a KPA-1500, and Low Power
Key Out via the ACConnector works fine for controlling the amplifier, so
I assume the basic functionality is OK.  Any advice?  I'd really love to
get it going for the Stew tomorrow!


73, Pete N4ZR
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