Elecraft

K2 smeter not showing RF Power

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iw2noy

K2 smeter not showing RF Power

Hello,

a friend of mine have an Elecraft K2, always working perfectly.
Yesterday, without any apparently motivation, the smeter stop to show RF Power level during transmit.

The K2 emit power without problem and the external wattmeter show the right power.
The smeter is working in RX, but not working in TX.
The K2 is mainly used in CW, so the switch button RF/ALC is not working.

Any ideas ?

Thanks a lot, graziano IW2NOY
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Don Wilhelm

Re: K2 smeter not showing RF Power

Graziano,

Does the DISPLAY button work normally? If so, there is no problem with
the button itself.
The difference between a tap and a hold is determined by the MCU.

73,
Don W3FPR

On 5/22/2017 6:13 AM, Graziano Roccon wrote:
> Hello,
>
> a friend of mine have an Elecraft K2, always working perfectly.
> Yesterday, without any apparently motivation, the smeter stop to show RF Power level during transmit.
>
> The K2 emit power without problem and the external wattmeter show the right power.
> The smeter is working in RX, but not working in TX.
> The K2 is mainly used in CW, so the switch button RF/ALC is not working.
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iw2noy

Re: K2 smeter not showing RF Power

Hello Don,
thanks for the answer.
Maybe i did a wrong explanation and the last lines made a bit of confusion.
I was intended to say that is normal that when you are in CW, when you press the RF-/ALC button nothing happen and you get only a "BUP-TONE" back !

The problem is the during transmission the SMETER seems dead and doesn't show the RF power output, but in reception the smeter is working correctly signing the segnal streght.

We can't understand what is happening. Two days ago, everything was working fine.

Thanks a lot, Ciao, Graziano IW2NOY

> Il 22 maggio 2017 alle 22.11 Don Wilhelm <[hidden email]> ha scritto:
>
>
> Graziano,
>
> Does the DISPLAY button work normally? If so, there is no problem with
> the button itself.
> The difference between a tap and a hold is determined by the MCU.
>
> 73,
> Don W3FPR
>
> On 5/22/2017 6:13 AM, Graziano Roccon wrote:
> > Hello,
> >
> > a friend of mine have an Elecraft K2, always working perfectly.
> > Yesterday, without any apparently motivation, the smeter stop to show RF Power level during transmit.
> >
> > The K2 emit power without problem and the external wattmeter show the right power.
> > The smeter is working in RX, but not working in TX.
> > The K2 is mainly used in CW, so the switch button RF/ALC is not working.

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Don Wilhelm

Re: K2 smeter not showing RF Power

Graziano,

I understand the S-meter display is OK, but that is not related to what
I was saying.
I hate to see you replace the pushbutton and still have the problem.

Tap the DISPLAY button and see if it displays the voltage and current.
If not, replace the pushbutton.
If it does display the voltage and current then the pushbutton is OK
You are trying to determine if the pushbutton is bad or the MCU is confused.

If the pushbutton works for DISPLAY, then the MCU/firmware is confused
and you should do a Master Reset.
Before you do that, record ALL your menu setting including the filter
settings. Download the K2 A to B instructions which has a nice chart
and instructions to record the menu settings.
After the reset, do a CAL PLL followed by restoring the menu settings.

If you do replace the pushbutton, the button leads do not extend very
far through the board which makes solder removal difficult. Clip the
leads close to the pushbutton body and remove them one at a time. Clear
the holes with solder wick and if solder remains, heat the solder pads
and clear the holes with a wooden toothpick.

73,
Don W3FPR

On 5/23/2017 6:17 AM, Graziano Roccon wrote:

> Hello Don,
> thanks for the answer.
> Maybe i did a wrong explanation and the last lines made a bit of confusion.
> I was intended to say that is normal that when you are in CW, when you press the RF-/ALC button nothing happen and you get only a "BUP-TONE" back !
>
> The problem is the during transmission the SMETER seems dead and doesn't show the RF power output, but in reception the smeter is working correctly signing the segnal streght.
>
> We can't understand what is happening. Two days ago, everything was working fine.
>
> Thanks a lot, Ciao, Graziano IW2NOY
>
>
>> Il 22 maggio 2017 alle 22.11 Don Wilhelm <[hidden email]> ha scritto:
>>
>>
>> Graziano,
>>
>> Does the DISPLAY button work normally? If so, there is no problem with
>> the button itself.
>> The difference between a tap and a hold is determined by the MCU.
>>
>> 73,
>> Don W3FPR
>>
>> On 5/22/2017 6:13 AM, Graziano Roccon wrote:
>>> Hello,
>>>
>>> a friend of mine have an Elecraft K2, always working perfectly.
>>> Yesterday, without any apparently motivation, the smeter stop to show RF Power level during transmit.
>>>
>>> The K2 emit power without problem and the external wattmeter show the right power.
>>> The smeter is working in RX, but not working in TX.
>>> The K2 is mainly used in CW, so the switch button RF/ALC is not working.