Related question: Does KEY OUT essentially follow the TX state? IAW,
if PTT or VOX is asserted, it also asserts? If so, I guess that means
that it follows the keying when in QSK? It's a real PITA to get to the
back of my K3 right now or I'd check it myself.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 10/13/2017 2:47 PM, Don Wilhelm wrote:
Pete,
As mentioned by others, the K3(S) KEYOUT jack does not produce any
voltage - the voltage must be produced by another source (sufficient
to power the relay).
One method to check the K3 KEYOUT is to use your Ohmmeter. stick the
red probe into the center of the jack and the other probe to the shell.
It should read a very high resistance, even infinity (same as your
ohmmeter reads with the probes attached to nothing) during receive,
and then go to a very low value (close to zero ohms) during TUNE or
Transmit.
If it does not do that, you may have a bad HEXFET driver for the
KEYOUT line.
73,
Don W3FPR
On 10/13/2017 9:33 AM, N4ZR wrote:
I am trying to use the Key Out jack on my K3 to key a small relay to
protect my SDR from RF. The 12V@40 ma is well within the stated
rating of the jack, but to my surprise it does not work. Measuring
with an analog multimeter, the jack appears to be shorted all the
time, and also to have a very small DC voltage on it. I don't have a
schematic for the radio, so I'm stumped. Is this a function of the
way I'm measuring, or...?
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