[Elecraft] Crosspost: K3S FSK shifts RX freq after Xmit

[briancom]

Initiate similar transmissions without Winwarbler and see if the same thing happens.  Bet it does not.
73 de Brian K3KO

Sent from my iPad

> On Mar 13, 2017, at 8:19 PM, Chuck Chandler <chandlerusm at gmail.com> wrote:
> 
> Cross-posted to both DXLabs and Elecraft lists, since I am not sure where
> the issue lies.
> 
> After some experimenting, I find that my K3S will shift the receive
> frequency after transmitting in RTTY (FSK D Data mode.)  Finding a busy
> band, I can see that if I tune in 5U5R exactly on 14.080.000, then send a
> RTTY transmission that after the RTTY transmission ends my rig is now still
> showing 14.080.000 on the screen but I am receiving a signal from somewhere
> around 14.078.78, near as I can make out from the P3.  There's another data
> mode being used down there and the fellow has a nice, strong signal that
> comes and goes so I can tell when the signal starts and stops. This happens
> when I send from the keyboard as well as from a macro.
> 
> I first noticed this in live transmissions but have spent the last half
> hour in TX Test mode, and the same thing happens even with no output.
> 
> As soon as I tap XFIL the filter setting doesn't change but there the 5U5R
> is again.
> 
> Alternatively, if I rotate the Shift knob either direction, the 5U5R is
> back.  The FC is set to 2.21 kHz.
> 
> Alternatively, if I rotate the width control in either direction, it goes
> back to receiving the 5U5R.
> 
> This only happens when I am using the 400 Hz 8-pole filter or the APF
> (which also uses the 400.)  When I use the 2.7 5-pole this doesn't happen.
> 
> This feels like something is applying an offset of 1220 Hz while I transmit
> and not letting it go.  But I'm at a loss to figure it out.  My digi app is
> WinWarbler, and I have AFC unchecked.  It shows a steady freq for xmit and
> rcv at 14.080.000 during all this.
> 
> 1220 is just about half of 2210, so there's that.  Also, the K3S TX Test
> mode doesn't key the finals, so there's no RF getting into it.
> 
> This feels like something is set wrong, but blimey if I can figure it out.
> 
> 73 de Chuck, WS1L
> -- 
> 
> 
> ===================
> Chuck Chandler
> chandlerusm at gmail.com
> ===================
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