[Elecraft] K4 Features and current K3+

[Jim Rhodes]

That is the way my old TS-570 is but my K3 has only 1 ptt line, but if I am
not mistaken in digital modes the mic is muted. I am not sure of that since
I hardly ever have a mic plugged in, but I think that is what I read in the
book.

Jim Rhodes
K0XU

On Fri, Sep 20, 2019, 09:05 Andy Durbin <a.durbin at msn.com> wrote:

> "I need to be able to switch from digital (M110A) to voice on a moments
> notice so can not use the digital modes.  The mike is hot while
> transmitting digital.  Most mikes leave the mike element hot.  The PTT is a
> SPST switch.  This means that you have to be careful not to have any noise
> in the shack while transmitting digital.  If there is a way on the K3,
> service was not able to point it out."
>
> It would be very surprising to me if K3 and K4 had such a limitation.
> This situation is handled perfectly in the Kenwood TS-590 by using 2
> distinct keying commands.   Front panel PTT is equivalent to CAT TX0; and
> takes modulation from the front panel mic jack.  TX1;  and the equivalent
> ACC hardware PTT, take modulation from the USB Audio CODEC or ACC analog
> audio input leaving the mic muted.
>
> Switching between front mic and digital is simply accomplished by
> asserting the appropriate PTT line or CAT command.  The digital mode
> application asserts TX1;  Keying mode cannot be changed while transmitting
> so first keying command wins until TX stops.
>
> 73,
> Andy, k3wyc
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