At Field Day this year, the K3 TX light started flashing when we loaded
N1MM to use RTS=PTT to send .wav files. This only occurs when RTS=PTT is
set on the rig. I thought it was a bug in N1MM but it also does this
when
using N3FLP's logger and the flashing corresponds to the polling rate
(which N3FJP allows one to set).
Check whether RTS is active when you powered up the K3. Yaesu radios
have a similar safety feature (cannot transmit if key is engaged during
powerup, it avoids the radio immediately transmitting when the
microphone is jammed under some electronics project or the cat sleeps on
top of the morse key.
I apologise for replying to my own mail but the exact behavior is
described in the K3S manual (page 20):
PTT and Keying (via DTR and RTS)
In the K3S, these are not used as serial I/O handshaking lines. Instead,
the K3S can use these as PTT IN or KEY IN (see CONFIG:PTT-KEY). The
default for both signals is inactive. Refer to application software
documentation to determine if it can use RS232 signal lines for PTT or
keying.
Use these signals with caution. A computer may assert DTR or RTS during
power-up, causing the K3S to transmit unexpectedly. If a computer or
other device asserts RTS or DTR while you’re using the PTT-KEY menu
entry, the K3S will enter TEST mode as a precaution, allowing you to
change the menu setting if required.
... and test mode shows as the TX light flashing.
So it's even in the manual!
Geert Jan
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