[Elecraft] Key Out jack

[Fred Jensen]

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 at 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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