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[PX3] Does not respond to the knob being rotated

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James Austin

[PX3] Does not respond to the knob being rotated

My PX3 no longer responds to the knob being turned. The only indication I
see when turning it is when the marker frequency is being displayed. When
turning the knob, the displayed marker frequency bounces back and forth
between something like 14.050.80 and 14.050.85.

The PX3 is otherwise functional.

Any suggestions? I opened it up and all the solder connections for the
encoder are solid.

73,

Jim/KA2RVO
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Stephen Shearer

Re: [PX3] Does not respond to the knob being rotated

I have seen a similar issue with my PX3 but it may not be the same or it
may be related to the root of the problem.

What I notice is what "in the old days" would be switch bounce. What I
notice (like you) is when I turn the knob fast the value bounces around
but doesn't go anywhere. I find that if I turn the knob real slow it
will work. The knob is an encoder and must be seeing CW/CCW pulses out
of sync or something like that?

Does slow work?

steve WB3LGC

On 10/16/2016 12:34 PM, James Austin wrote:

> My PX3 no longer responds to the knob being turned. The only indication I
> see when turning it is when the marker frequency is being displayed. When
> turning the knob, the displayed marker frequency bounces back and forth
> between something like 14.050.80 and 14.050.85.
>
> The PX3 is otherwise functional.
>
> Any suggestions? I opened it up and all the solder connections for the
> encoder are solid.
>
> 73,
>
> Jim/KA2RVO
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Please help support this email list: http://www.qsl.net/donate.html
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dmb@lightstream.net

Re: [PX3] Does not respond to the knob being rotated

Steve,

Just another data point ...

My PX3 exhibits the same behavior in a system that includes the KXPA100. I
see it happen when I twist the KX3's OFS knob to quickly QSY. However, if
I turn OFF the the KXPA100 via the KX3 "PA MODE" menu option, the PX3
responds immediately to a twist of the KX3 OFS knob. If I turn the KXPA100
"ON" again, a quick turn of OFS results in the original sluggish PX3
response. Perhaps communications between the KX3 and the KXPA100 is at a
higher priority than between the KX3 and the PX3.

73,

Dale - WA8SRA

> I have seen a similar issue with my PX3 but it may not be the same or it
> may be related to the root of the problem.
>
> What I notice is what "in the old days" would be switch bounce. What I
> notice (like you) is when I turn the knob fast the value bounces around
> but doesn't go anywhere. I find that if I turn the knob real slow it
> will work. The knob is an encoder and must be seeing CW/CCW pulses out
> of sync or something like that?
>
> Does slow work?
>
> steve WB3LGC
>
>
> On 10/16/2016 12:34 PM, James Austin wrote:
>> My PX3 no longer responds to the knob being turned. The only indication
>> I
>> see when turning it is when the marker frequency is being displayed.
>> When
>> turning the knob, the displayed marker frequency bounces back and forth
>> between something like 14.050.80 and 14.050.85.
>>
>> The PX3 is otherwise functional.
>>
>> Any suggestions? I opened it up and all the solder connections for the
>> encoder are solid.
>>
>> 73,
>>
>> Jim/KA2RVO
>> ______________________________________________________________
>> 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
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James Austin

Re: [PX3] Does not respond to the knob being rotated

In reply to this post by Stephen Shearer

It's the same behavior, whether you move the knob slow or fast, kind of
like one of the channels on the encoder is being lost. Elecraft told me I
need to send it in to be repaired.

Jim/KA2RVO

On Tue, Oct 18, 2016 at 5:55 PM, Steve <[hidden email]> wrote:

> I have seen a similar issue with my PX3 but it may not be the same or it
> may be related to the root of the problem.
>
> What I notice is what "in the old days" would be switch bounce. What I
> notice (like you) is when I turn the knob fast the value bounces around but
> doesn't go anywhere. I find that if I turn the knob real slow it will
> work. The knob is an encoder and must be seeing CW/CCW pulses out of sync
> or something like that?
>
> Does slow work?
>
> steve WB3LGC
>
>
> On 10/16/2016 12:34 PM, James Austin wrote:
>
>> My PX3 no longer responds to the knob being turned. The only indication I
>> see when turning it is when the marker frequency is being displayed. When
>> turning the knob, the displayed marker frequency bounces back and forth
>> between something like 14.050.80 and 14.050.85.
>>
>> The PX3 is otherwise functional.
>>
>> Any suggestions? I opened it up and all the solder connections for the
>> encoder are solid.
>>
>> 73,
>>
>> Jim/KA2RVO
>> ______________________________________________________________
>> 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
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>
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> Message delivered to [hidden email]
>

ve3ibw

Re: [PX3] Does not respond to the knob being rotated

In reply to this post by Stephen Shearer

I will pile on and corroborate Steve's observations. I too have noticed
the same behaviour on my PX3. I don't use the knob all that often. While
I can't rule out a mechanical problem, I did notice this slow versus fast
knob-turning behaviour after I loaded in one of the PX3 firmware updates.
It was likely the second to last firmware update currently available, but I
can't recall specifically which firmware update.

regards,
Brian
VE3IBW

On Tue, Oct 18, 2016 at 6:55 PM, Steve <[hidden email]> wrote:

> I have seen a similar issue with my PX3 but it may not be the same or it
> may be related to the root of the problem.
>
> What I notice is what "in the old days" would be switch bounce. What I
> notice (like you) is when I turn the knob fast the value bounces around but
> doesn't go anywhere. I find that if I turn the knob real slow it will
> work. The knob is an encoder and must be seeing CW/CCW pulses out of sync
> or something like that?
>
> Does slow work?
>
> steve WB3LGC
>
>
> On 10/16/2016 12:34 PM, James Austin wrote:
>
>> My PX3 no longer responds to the knob being turned. The only indication I
>> see when turning it is when the marker frequency is being displayed. When
>> turning the knob, the displayed marker frequency bounces back and forth
>> between something like 14.050.80 and 14.050.85.
>>
>> The PX3 is otherwise functional.
>>
>> Any suggestions? I opened it up and all the solder connections for the
>> encoder are solid.
>>
>> 73,
>>
>> Jim/KA2RVO
>> ______________________________________________________________
>> 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]
>

Regards,
Brian
VE3IBW

n6hz

Re: [PX3] Does not respond to the knob being rotated

In reply to this post by James Austin

Hi Jim,

It sounds to me like your encoder is bad. You will either need to send your PX3 back to Elecraft for repair or contact Elecraft for a replacement encoder (if you would like to do the work yourself). Please contact Elecraft support directly. They can be reached via email at: k3support at you know where dot com.

Kindly,

Paul

n6hz

Re: [PX3] Does not respond to the knob being rotated

In reply to this post by ve3ibw

Hi Brian,

The PX3 encoder interface was changed in revision 1.25 (4/17/2015). This change greatly enhanced the operation of the select knob encoder. If you're experiencing severe 'jerkiness' of the encoder, it's usually a sign that the encoder is bad. It would however be interesting to see what your PX3 would do with older firmware. Email me directly if you'd be interested in trying that out. My email is pauls at you know where dot com.

-Paul