[Elecraft] K3S Power On / PTT

[Marco HB9CAT]

Thanks Lyle, 
I tried the beta and it addresses exactly the issue I experienced; tried it out, works fine :-)

For reference in case others experienced the same:
* PTT/KEY USE WITH THE USB PORT IMPROVED:  PC applications can activate PTT and KEY at the K3S via the USB port's RTS/DTR signals. However, initial setup of the rig's USB port by the PC may cause pulsed or continuous activation of the transmitter. 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 PTT-KEY 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.

Marco HB9CAT

-----Original Message-----
From: Lyle Johnson [mailto:kk7p4dsp at gmail.com] 
Sent: sabato, 8. agosto 2015 20:27
To: hb9cat at thezollingers.org; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3S Power On / PTT

This problem is fixed in the latest beta firmware for the K3/K3S. Until then, it is best to set PTT-KEY to OFF-OFF before taking the K3/K3S to a location without USB connectivity.

73,

Lyle KK7P

On 8/8/15 10:31 AM, Marco HB9CAT wrote:
> I configured my K3s to use DTR to key CW, (CONFIG:PTT-KEY to “Off-RTS”) and configured my logging program (Dxlog.net) accordingly; the COM port I’m using is the K3s virtual serial related to the USB connection. Everything worked fine.
>
> Later on I unplugged the K3s to use it in another location, where I’ve just connected power and antenna (no USB); right after powering it up it went to TX, USB RTS was probably in an undefined state being interpreted as high so it keyed CW.
> I knew that might be the problem so I tried to access the CONFIG:PTT-KEY menu: there was no way to get there while the K3s was stuck in TX, as usual I got to the the “FW Revs” default config menu but I couldn’t move to the other menus.
>
> The only possible solution has been to get hold of a PC, install USB drivers and set RTS low.
>
> Question: is there any alternative power-up sequence to enter a sort of safe mode allowing me to change configuration ?
>
> Thanks
>
> Marco HB9CAT
>
> P.S.: all firmware revisions are the latest 
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