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KX3 ACC2 GPIO

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n0uk

KX3 ACC2 GPIO

I wish to interface my KX3 to my portable 10GHz transporter system. I have the transporter’s PTT sequencer configured to output a +ve TX Inhibit signal which I have been using to prevent my current I/F rig from transmitting until all relays have changed over to transmit. The current rig is a Yaesu FT-817.

I want to be able to simply switchover the PTT/TXInh cable between the two rigs, so that I can continue using the ‘817 as a backup in the event of some problem with the KX3, and so was intending to us the KX3’s ACC2 GPIO TX Inh +ve input just as I do the 817.

However, it seems that the KX3 actually has some bias applied that requires to be pulled low to enable the transmitter, rather than looking for removal of the +ve signal. This will mean that I need more than to simple switch over the physical connectors on the umbilical cable. Although not insurmountable, it’s not exactly ideal.

Anyone else done this or similar and, if so, what was your solution?

73 Chris

Chris Cox, N0UK
[hidden email]

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n0uk

Re: KX3 ACC2 GPIO

And why does my Mac ALWAYS rewrite TRANSVERTER as TRANSPORTER?!

Chris Cox, N0UK
[hidden email]

> On Aug 31, 2020, at 12:50 PM, Chris Cox, N0UK <[hidden email]> wrote:
>
> I wish to interface my KX3 to my portable 10GHz transporter system. I have the transporter’s PTT sequencer configured to output a +ve TX Inhibit signal which I have been using to prevent my current I/F rig from transmitting until all relays have changed over to transmit. The current rig is a Yaesu FT-817.
>
> I want to be able to simply switchover the PTT/TXInh cable between the two rigs, so that I can continue using the ‘817 as a backup in the event of some problem with the KX3, and so was intending to us the KX3’s ACC2 GPIO TX Inh +ve input just as I do the 817.
>
> However, it seems that the KX3 actually has some bias applied that requires to be pulled low to enable the transmitter, rather than looking for removal of the +ve signal. This will mean that I need more than to simple switch over the physical connectors on the umbilical cable. Although not insurmountable, it’s not exactly ideal.
>
> Anyone else done this or similar and, if so, what was your solution?
>
> 73 Chris
>
>
> Chris Cox, N0UK
> [hidden email]
>
> ______________________________________________________________
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Gwen Patton

Re: KX3 ACC2 GPIO

I hate to break it too you, Chris...but your Mac is...a Trekkie. ;)

73,
Gwen, NG3P

On Mon, Aug 31, 2020, 1:53 PM Chris Cox, N0UK <[hidden email]> wrote:

> And why does my Mac ALWAYS rewrite TRANSVERTER as TRANSPORTER?!
>
> Chris Cox, N0UK
> [hidden email]
>
>
>
> > On Aug 31, 2020, at 12:50 PM, Chris Cox, N0UK <[hidden email]> wrote:
> >
> > I wish to interface my KX3 to my portable 10GHz transporter system. I
> have the transporter’s PTT sequencer configured to output a +ve TX Inhibit
> signal which I have been using to prevent my current I/F rig from
> transmitting until all relays have changed over to transmit. The current
> rig is a Yaesu FT-817.
> >
> > I want to be able to simply switchover the PTT/TXInh cable between the
> two rigs, so that I can continue using the ‘817 as a backup in the event of
> some problem with the KX3, and so was intending to us the KX3’s ACC2 GPIO
> TX Inh +ve input just as I do the 817.
> >
> > However, it seems that the KX3 actually has some bias applied that
> requires to be pulled low to enable the transmitter, rather than looking
> for removal of the +ve signal. This will mean that I need more than to
> simple switch over the physical connectors on the umbilical cable.
> Although not insurmountable, it’s not exactly ideal.
> >
> > Anyone else done this or similar and, if so, what was your solution?
> >
> > 73 Chris
> >
> >
> > 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]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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Rich NE1EE

Re: KX3 ACC2 GPIO

In reply to this post by n0uk

If you are using Mac OS X Mail, does it have the feature to add words to its spell checker? I just added a bunch of ham related terms to my editor because it was painting the screen red with all the "misspelled" words.

On 2020-08-31 12:53:-0500, Chris Cox, N0UK wrote:

>And why does my Mac ALWAYS rewrite TRANSVERTER as TRANSPORTER?!
>
>Chris Cox, N0UK
>[hidden email]

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k6dgw

Re: KX3 ACC2 GPIO

In reply to this post by Gwen Patton

Steve Jobs was always about form over function. Icons had to have
rounded corners, they were classier. Clearly, Transporter is a classier
word than Transverter. [:=)

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 8/31/2020 11:17 AM, Gwen Patton wrote:

> I hate to break it too you, Chris...but your Mac is...a Trekkie. ;)
>
> 73,
> Gwen, NG3P
>
>
> On Mon, Aug 31, 2020, 1:53 PM Chris Cox, N0UK <[hidden email]> wrote:
>
>> And why does my Mac ALWAYS rewrite TRANSVERTER as TRANSPORTER?!
>>
>> Chris Cox, N0UK
>> [hidden email]
>>

n0uk

Re: KX3 ACC2 GPIO

In reply to this post by n0uk

Thanks all - hopefully it now knows what a transverter is.

Chris Cox, N0UK
[hidden email]

> On Aug 31, 2020, at 1:31 PM, Raymond Sills <[hidden email]> wrote:
>
> HI Chris:
>
> You have to "teach" the dictionary to understand that transverter is a real word. For whatever reason, I must have done that at some time, since I can have transporter and transverter in the same sentence with this iMac.
>
> But we knew what you meant, even if the Mac didn't. :)
>
> 73 de Ray
>
>
>
>
> -----Original Message-----
> From: Chris Cox, N0UK <[hidden email]>
> To: [hidden email]; [hidden email]
> Sent: Mon, Aug 31, 2020 1:53 pm
> Subject: Re: [Elecraft] KX3 ACC2 GPIO
>
> And why does my Mac ALWAYS rewrite TRANSVERTER as TRANSPORTER?!
>
> Chris Cox, N0UK
> [hidden email]
>
>
>
> > On Aug 31, 2020, at 12:50 PM, Chris Cox, N0UK <[hidden email]> wrote:
> >
> > I wish to interface my KX3 to my portable 10GHz transporter system. I have the transporter’s PTT sequencer configured to output a +ve TX Inhibit signal which I have been using to prevent my current I/F rig from transmitting until all relays have changed over to transmit. The current rig is a Yaesu FT-817.
> >
> > I want to be able to simply switchover the PTT/TXInh cable between the two rigs, so that I can continue using the ‘817 as a backup in the event of some problem with the KX3, and so was intending to us the KX3’s ACC2 GPIO TX Inh +ve input just as I do the 817.
> >
> > However, it seems that the KX3 actually has some bias applied that requires to be pulled low to enable the transmitter, rather than looking for removal of the +ve signal. This will mean that I need more than to simple switch over the physical connectors on the umbilical cable. Although not insurmountable, it’s not exactly ideal.
> >
> > Anyone else done this or similar and, if so, what was your solution?
> >
> > 73 Chris
> >
> >
> > 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]
>
>
> ______________________________________________________________
> 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]

KENT TRIMBLE

Re: KX3 ACC2 GPIO

In reply to this post by Gwen Patton

Because it's a truck.

K9ZTV

> On Mon, Aug 31, 2020, 1:53 PM Chris Cox, N0UK <[hidden email]> wrote:
>
>> And why does my Mac ALWAYS rewrite TRANSVERTER as TRANSPORTER?!
>>
>> Chris Cox, N0UK
>> [hidden email]
>>
>>
>>
>>

--
This email has been checked for viruses by AVG.
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n0uk

Re: KX3 ACC2 GPIO

In reply to this post by n0uk

I’ve thought the problem through further and have decided to use a simple mosfet switch in the connector shell to invert the TXInh logic sense and configure the KX3 for -TXInh instead of +TXInh.

Hard switching the GPIO pin showed that to be a usable workaround.

73! Chris Cox, N0UK
[hidden email] or [hidden email]

> On Aug 31, 2020, at 12:51, Chris Cox, N0UK <[hidden email]> wrote:
>
> I wish to interface my KX3 to my portable 10GHz transporter system. I have the transporter’s PTT sequencer configured to output a +ve TX Inhibit signal which I have been using to prevent my current I/F rig from transmitting until all relays have changed over to transmit. The current rig is a Yaesu FT-817.
>
> I want to be able to simply switchover the PTT/TXInh cable between the two rigs, so that I can continue using the ‘817 as a backup in the event of some problem with the KX3, and so was intending to us the KX3’s ACC2 GPIO TX Inh +ve input just as I do the 817.
>
> However, it seems that the KX3 actually has some bias applied that requires to be pulled low to enable the transmitter, rather than looking for removal of the +ve signal. This will mean that I need more than to simple switch over the physical connectors on the umbilical cable. Although not insurmountable, it’s not exactly ideal.
>
> Anyone else done this or similar and, if so, what was your solution?
>
> 73 Chris
>
>
> Chris Cox, N0UK
> [hidden email]
>

n0uk

Re: KX3 ACC2 GPIO

Just as final follow up, a mosfet switch worked for my requirements perfectly.

73! Chris Cox, N0UK
[hidden email] or [hidden email]

> On Aug 31, 2020, at 18:26, Chris Cox <[hidden email]> wrote:
>
> I’ve thought the problem through further and have decided to use a simple mosfet switch in the connector shell to invert the TXInh logic sense and configure the KX3 for -TXInh instead of +TXInh.
>
> Hard switching the GPIO pin showed that to be a usable workaround.
>
> 73! Chris Cox, N0UK
> [hidden email] or [hidden email]
>
>
>> On Aug 31, 2020, at 12:51, Chris Cox, N0UK <[hidden email]> wrote:
>>
>> I wish to interface my KX3 to my portable 10GHz transporter system. I have the transporter’s PTT sequencer configured to output a +ve TX Inhibit signal which I have been using to prevent my current I/F rig from transmitting until all relays have changed over to transmit. The current rig is a Yaesu FT-817.
>>
>> I want to be able to simply switchover the PTT/TXInh cable between the two rigs, so that I can continue using the ‘817 as a backup in the event of some problem with the KX3, and so was intending to us the KX3’s ACC2 GPIO TX Inh +ve input just as I do the 817.
>>
>> However, it seems that the KX3 actually has some bias applied that requires to be pulled low to enable the transmitter, rather than looking for removal of the +ve signal. This will mean that I need more than to simple switch over the physical connectors on the umbilical cable. Although not insurmountable, it’s not exactly ideal.
>>
>> Anyone else done this or similar and, if so, what was your solution?
>>
>> 73 Chris
>>
>>
>> Chris Cox, N0UK
>> [hidden email]
>>

n0uk

Continuing saga with Tx Inhibit and the KX3 - possible firmware bug?

In reply to this post by Rich NE1EE

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]

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