[Elecraft] K4 Features and current K3+

[RALPH TURK]

I can not use the digital modes because I need to switch to Upper SB after the last 
electron has been sent in the digital mode and the reverse.  Call is instant break in 
between USB voice and digital M110 A
This could be a deal breaker on a K4 purchase.
Ralph, W7HSG/AFA9rt


> On September 20, 2019 at 12:52 PM Jim Rhodes <jim at rhodesend.net> wrote:
> 
> 
> 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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