[Elecraft] K3 Macro to control KEY OUT

[Guy Olinger K2AV]

Yes, yes, yes....  You're right.  I keep forgetting this one.  I have some
mental block about it.  Sorry all for the blather.

It's one of the few control leads that are not driven by their own state
output from the CPU.  It's run off of 7R to add the transition time to the
state change in the amp for QSK. Works very well except for tuning after the
amp, that isn't auto-tuning in the amp.

73, Guy.

On Tue, May 31, 2011 at 2:42 PM, Joe Subich, W4TV <lists at subich.com> wrote:

>
> > I want to disable the KEY OUT from the K3. I can use the DIGOUT1 and
> > an external relay to do that, but it would certainly be cleaner to
> > just disable the KEY OUT circuit. I find no command in the
> > Programmers  Manual to do that - am I missing something?
>
> You *CAN NOT* disable Key Out.  It is a hardware output from the T/R
> circuit (7R line).  Since 7R is high when the receive is on and low
> when the receiver is off/muted there is *no way* to selectively disable
> Key Out (see page 3 of the current schematic set).
>
> This issue has been beat to death here ... it is a design feature of
> the K3.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 5/31/2011 2:13 PM, Bill Myers wrote:
> > I use a macro to control my external amp (not a KPA500).  One macro
> reduces
> > power to the drive requirements of the amp, the other increases the power
> to
> > 85 W when I don't need the amp.  When I activate the 85 W macro, I must
> > disable the amp or it gets hit with the 85 W sending it into the protect
> > mode.  I want to disable the KEY OUT from the K3.  I can use the DIGOUT1
> and
> > an external relay to do that, but it would certainly be cleaner to just
> > disable the KEY OUT circuit.  I find no command in the Programmers Manual
> to
> > do that - am I missing something?
> >
> > Bill K6IFF
> >
>
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