[Elecraft] Transmit when switching from DATA to AM mode?

[David F. Reed]

K3 #1476 here, and it does not do this, neither on manual switch nor by 
computer control...

73 de Dave, W5SV

John Buck wrote:
>
> I confirmed on K3 #125 with V 2.76, the behavior described by KB8AP 
> below.
> I also noted that the power supply jumps up to the level expected for 
> the power setting.
> So I believe that it is attempting to transmit during the second or so 
> of the transient.
> This is not a good thing.  I do not have a 6 kHz filter installed.
>
> John KH7T
>
> Hi all,
>
> I've just discovered something odd with my K3 (#1772).  When I switch 
> mode from DATA to AM via the front panel Mode button, the rig tries to 
> transmit.  The red TX light comes on momentarily and I get a ERR TXF 
> message (if in band) or an END message (if out of band) in the VFO B 
> area.  I don't have the AM filter installed, so I don't think anything 
> is actually going out over the air, but it doesn't seem like the rig 
> should ever go into transmit on a mere mode change.
>
> It ONLY happens when going from DATA to AM, not when going from FM to 
> AM or between any other modes in either direction.  There is no mic 
> connected to the rig, nor anything connected to the rear panel mic or 
> line inputs.  The only things connected to the rig are a paddle, an 
> external speaker, and the antenna.   It happens whether in VOX or PTT 
> mode.
>
> I first noticed it with MCU 2.67 (although I can't say if it happened 
> with earlier versions.)  I've updated to the 2.76 beta release and it 
> still happens.
>
> Anyone else see this?
>
> 73