KX3 FW - N0UK tx inhibit & CW sidetone bug reproduced

[Drew Arnett]

I was able to reproduce the bug Chris, N0UK, reported with tx inhibit
and CW sidetone on the KX3.

To be thorough, the FW as just installed by Elecraft, is uC 02.90
anddsp 01.52which is the latest.

I have cabling for the ACC2 port, as I use ring contact to PTT a
transverter and also to PTT a KXPA100.

Menus have had minimal configuration post service from elecraft, just
enough to setup for transverter operation in the 10 GHz contest.  Mode
is CW and VOX is on of course.

ACC2 Inhibit = Low.  I used a paddle on the KXPD paddle port (key 2).
Was able to get the stuck sidetone as you describe while sending dits
or sending dahs by.  (Key 2 left = dot.)  For kicks, changed to Key 2
= hand.  Found that if the key is released before inhibit is released,
the sidetone does not stick.  The value of inhibit when the key is
initially asserted is not buggy. Saw the same behavior with menu
setting inhibit high.

inhibit low
key - inhibit - inhibit release - key release --> sidetone stuck
key - inhibit - key release - inhibit release --> sidetone OK
inhibit - key - inhibit release - key release --> sidetone stuck
inhibit - key - key release - inhibit release --> sidetone OK

inhibit high
key - inhibit - inhibit release - key release --> sidetone stuck
key - inhibit - key release - inhibit release --> sidetone OK
inhibit - key - inhibit release - key release --> sidetone stuck
inhibit - key - key release - inhibit release --> sidetone OK

The behavior is a problem is in the firmware at the inhibit released event.

A thorough bug report would also include observations of the PTT
output and actual RF output.

Best regards,

Drew
n7da

>    6. Continuing saga with Tx Inhibit and the KX3 - possible
>       firmware bug? (Chris Cox, N0UK)
>   16. KX3 Tx Inhibit CW-VOX problem (Chris Cox, N0UK)
>
>
> Message: 6
> Date: Mon, 14 Sep 2020 16:14:57 -0500
> From: "Chris Cox, N0UK" <[hidden email]>
> To: [hidden email]
> Cc: [hidden email]
> Subject: [Elecraft] Continuing saga with Tx Inhibit and the KX3 -
>         possible        firmware bug?
> Message-ID: <[hidden email]>
> Content-Type: text/plain;       charset=utf-8
>
> Having solved the need for getting +Ve Tx Inhibit working on my KX3/10GHz Transverter integration using a mosfet switch to invert the signal and configured the KX3 for 0v Tx Inhibit, I had opportunity to test it out this afternoon.
>
> The solution seemed to work fine on SSB but I now have a weird issue when using the rig on CW.
>
> If I manually select transmit with the microphone PTT and then wait for the transverter sequencing to remove Tx Inhibit and then key CW with the paddles, the system works as desired.
>
> If I key the system using VOX, the Tx Inhibit functions correctly, fully disabling the transmitter from producing RF until TxInhibit is removed BUT the CW sidetone becomes permanently on from the moment TXInh disappears regardless of whether I am sending or not.  It stays present until I press any of the buttons on the KX3.   This happens regardless of which band is enabled, but occurs whenever TxInhibit is present.
>
> If I remove the TXInh fro the GPIO input (but leave the option enabled in the KX3 config) the rig operates normally.
>
> Can anyone else replicate this oddball behavior?  It seems to be a firmware bug.  I have tried removing power but that does not alter the effect.
>
> Again, all works just fine if I don?t try to key the paddles before PTT sequencing has changed over.
>
> Chris Cox, N0UK
> [hidden email]
>
>
>
>
>
>
> Message: 16
> Date: Tue, 15 Sep 2020 08:10:31 -0500
> From: "Chris Cox, N0UK" <[hidden email]>
> To: [hidden email]
> Subject: [Elecraft] KX3 Tx Inhibit CW-VOX problem
> Message-ID: <[hidden email]>
> Content-Type: text/plain;       charset=utf-8
>
> Having solved the need for getting +Ve Tx Inhibit working on my KX3/10GHz Transverter integration using a MOSFET switch to invert the logic level coming from the 10GHz transverter and configured the KX3 for 0v Tx Inhibit, I had the opportunity to test it out yesterday afternoon.
>
> The solution seemed to work fine on SSB but I now have a weird issue when using the rig on CW.
>
> If I manually select transmit with the microphone PTT (didn?t try the XMIT key) and then wait for the transverter sequencing to remove Tx Inhibit and then key CW with the paddles, the system works as desired.
>
> If I key the system using CW VOX, the Tx Inhibit functions correctly, fully disabling the transmitter from producing RF until TxInhibit is removed by the transverter?s sequencing logic BUT then the CW sidetone becomes permanently on from the moment TXInh disappears, regardless of whether I am keying or not.  It stays present until I press any of the buttons on the KX3.   This happens regardless of which band is enabled, but occurs whenever TxInhibit is initially present.
>
> If I remove the TXInh fro the ACC2 GPIO input (but leave the option enabled in the KX3 config) the rig operates normally under VOX control.
>
> Can anyone else replicate this oddball behavior?  It seems to be a firmware bug.  I have tried removing power from the KX3 but that does not correct the anomalous behavior.
>
> Again, all works just fine if I don?t try to key the paddles before PTT sequencing has changed over.
>
> Chris Cox, N0UK
> Chris Cox, N0UK
> [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]