[Elecraft] K3 auto transmit - W7RIP

[Mark Musick]

Rip,
Try this from the K3S errata of the owner's manual from back in 2016. Then you don't have to mess with Window's settings.

PTT/KEY USE WITH THE USB PORT IMPROVED: Some PC applications can control PTT and
KEY at the K3S via the RTS/DTR signals of the USB port. However, use of these signals may also allow
the PC's USB port initialization to unexpectedly activate transmit at the K3S. This can happen if the
computer is turned on after the K3S, or if the USB cable is not connected. There is now a "Safe" mode
(the default) which disables PTT-KEY transmit until the K3S receives a command via USB, such as a
read of the rig's VFO frequency. To turn on safe mode on/off, go into CONFIG:PTT-KEY and tap '1' to
select "USB SAFE" or "UNSAFE". Exit the menu and turn the K3S off/on. Applications that use PTTKEY
via USB but never send commands may require "UNSAFE" mode. In this case, unwanted
transmit can be avoided by turning the PC on before the K3S.

This should also apply to the K3 as it was part of a firmware update. I don't remember which one.

73,
Mark, WB9CIF

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Rip R
Sent: Monday, April 18, 2022 18:51
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 auto transmit - W7RIP

Thanks for the help W0VTT, AB7E, & K6MKF. I tried each advice as I received it and thought I had it fixed until today. I had been switching out antenna feeds when the rig transmitted as before. I think the changes in the PC (Win 10 device mgr) that Mike W0VTT suggested may be the ultimate solution; we'll see. Thanks again guys for taking the time to help me out on this. 73s Rip  W7RIP ______________________________________________________________
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