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P3 TXMonitor sometimes displays during receive

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David F. Reed-2

P3 TXMonitor sometimes displays during receive

Using my P3 monitor, set to display when TX is going on, sometimes goes
into displaying TX for a few seconds while I am receiving.

Has anyone else seen this, and know of a fix?

Thanks & 73 de W5SV, Dave

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Don Wilhelm

Re: P3 TXMonitor sometimes displays during receive

Dave,

What do you see on the display when that happens? If there is no TX RF
present, you should see a straight line. If you are seeing an envelope
display, then the K3 is actually going into transmit.

If you have a computer connection and also have the K3 menu parameter
for PTT-KEY set to RTS or DTR, I would be suspicious that your computer
is putting the K3 into transmit. Set PTT-KEY to OFF-OFF and see if the
problem goes away. If it does, there is nothing wrong with the K3/P3
and your fix will be at the computer or whatever software application
you are using.

73,
Don W3FPR

On 8/11/2016 5:30 PM, David F. Reed wrote:
> Using my P3 monitor, set to display when TX is going on, sometimes
> goes into displaying TX for a few seconds while I am receiving.
>
> Has anyone else seen this, and know of a fix?
>

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David F. Reed-2

Re: P3 TXMonitor sometimes displays during receive

Don,

thanks for the help; I will answer your questions in line between them...

On 8/11/2016 22:29, Don Wilhelm wrote:
> Dave,
>
> What do you see on the display when that happens? If there is no TX
> RF present, you should see a straight line. If you are seeing an
> envelope display, then the K3 is actually going into transmit.

I see an envelope, but not the same as when talking; it looks like a
horizontal tear drop.

>
> If you have a computer connection and also have the K3 menu parameter
> for PTT-KEY set to RTS or DTR, I would be suspicious that your
> computer is putting the K3 into transmit. Set PTT-KEY to OFF-OFF and
> see if the problem goes away.

They were, SET to TX in DXLab Commander; I have changed them to OFF.

> If it does, there is nothing wrong with the K3/P3 and your fix will be
> at the computer or whatever software application you are using.

Well, its not fixed, it is still doing it, and I note that the K3 is
staying in receive all the while; to TX led, RX not interrupted.

73 de Dave, W5SV

>
>
> 73,
> Don W3FPR
>
> On 8/11/2016 5:30 PM, David F. Reed wrote:
>> Using my P3 monitor, set to display when TX is going on, sometimes
>> goes into displaying TX for a few seconds while I am receiving.
>>
>> Has anyone else seen this, and know of a fix?
>>
>

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Howard Stephenson - K6IA

Re: P3 TXMonitor sometimes displays during receive

In reply to this post by David F. Reed-2

Dave,

Try this from P3 MCU 1.60 / SVGA 1.34 / March 21, 2016 release notes:

Enable/disable TX sensing at the TxMon coupler: Added TxSensEn to TxMon
sub-menu. This allows enabling/disabling of transmit sensing at the
coupler. For K3 and K3S users, TxSensEn can be set to “disabled”, which
will use the serial connection from the K3 to determine the TX state.
Setting TxSensEn to “enabled” will use forward power sensed at the TxMon
coupler to determine TX state (useful for non-Elecraft radios).

73
Howard Stephenson K6IA
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David F. Reed-2

Re: P3 TXMonitor sometimes displays during receive

Howard,

thanks for the idea; I now have things set as you suggest. Because it
was intermittent it may take a while to know if its "fixed" or not, so I
will report back after more testing. Thanks again for the idea.

73 de Dave, W5SV

On 8/12/2016 01:48, Howard Stephenson wrote:

> Dave,
>
> Try this from P3 MCU 1.60 / SVGA 1.34 / March 21, 2016 release notes:
>
> Enable/disable TX sensing at the TxMon coupler: Added TxSensEn to TxMon
> sub-menu. This allows enabling/disabling of transmit sensing at the
> coupler. For K3 and K3S users, TxSensEn can be set to “disabled”, which
> will use the serial connection from the K3 to determine the TX state.
> Setting TxSensEn to “enabled” will use forward power sensed at the TxMon
> coupler to determine TX state (useful for non-Elecraft radios).
>
> 73
> Howard Stephenson K6IA
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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Vic Rosenthal

Re: P3 TXMonitor sometimes displays during receive

I would have guessed that this was it. If you have a strong RF source in the neighborhood, then incoming power reflected back from the K3 would look like forward power from the rig, and might be enough to trigger it.
I have a 50 kW AM BC station that I can see from my antenna, and lots of 'funny' things that happen here are explained by this.

Vic 4X6GP

> On 12 Aug 2016, at 06:49, David F. Reed <[hidden email]> wrote:
>
> Howard,
>
> thanks for the idea; I now have things set as you suggest. Because it was intermittent it may take a while to know if its "fixed" or not, so I will report back after more testing. Thanks again for the idea.
>
> 73 de Dave, W5SV
>
>> On 8/12/2016 01:48, Howard Stephenson wrote:
>> Dave,
>>
>> Try this from P3 MCU 1.60 / SVGA 1.34 / March 21, 2016 release notes:
>>
>> Enable/disable TX sensing at the TxMon coupler: Added TxSensEn to TxMon
>> sub-menu. This allows enabling/disabling of transmit sensing at the
>> coupler. For K3 and K3S users, TxSensEn can be set to “disabled”, which
>> will use the serial connection from the K3 to determine the TX state.
>> Setting TxSensEn to “enabled” will use forward power sensed at the TxMon
>> coupler to determine TX state (useful for non-Elecraft radios).
>>
>> 73
>> Howard Stephenson K6IA
>> ______________________________________________________________
>> 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]
>
> ______________________________________________________________
> 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]

David F. Reed-2

Re: P3 TXMonitor sometimes displays during receive

In reply to this post by David F. Reed-2

Happy to report after extensive testing, that your suggestion was the
effective fix I had hoped for. Thank you sir!

73 de Dave, W5SV

On 8/12/2016 03:49, David F. Reed wrote:

> Howard,
>
> thanks for the idea; I now have things set as you suggest. Because it
> was intermittent it may take a while to know if its "fixed" or not, so
> I will report back after more testing. Thanks again for the idea.
>
> 73 de Dave, W5SV
>
> On 8/12/2016 01:48, Howard Stephenson wrote:
>> Dave,
>>
>> Try this from P3 MCU 1.60 / SVGA 1.34 / March 21, 2016 release notes:
>>
>> Enable/disable TX sensing at the TxMon coupler: Added TxSensEn to TxMon
>> sub-menu. This allows enabling/disabling of transmit sensing at the
>> coupler. For K3 and K3S users, TxSensEn can be set to “disabled”, which
>> will use the serial connection from the K3 to determine the TX state.
>> Setting TxSensEn to “enabled” will use forward power sensed at the TxMon
>> coupler to determine TX state (useful for non-Elecraft radios).
>>
>> 73
>> Howard Stephenson K6IA
>> ______________________________________________________________
>> 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]
>