[Elecraft] K2

[Don Wilhelm]

Jerry,

What is the serial number of that K2?  If below SN 3000, it likely does 
not have the alternate AF gain wiring.
In any case, with those symptoms, replace tha AF Gain pot.

Check to see if the KPA100 has the latest updates.  The instructions for 
the KPA100UPPKT will tell you.
Also check for the latest KPA100 shield.  The latest shield has spring 
clips to ground it to the base K2 (sand the paint off the contact 
places) -- also check for the width of the slot above the SO239 jack, it 
should be narrow (a bit over 1/8 inch).  If it is the older wide slot, 
replace the shield with the KPA100SHLDKT.

You can use the K2ATOBKIT instructions to check for other upgrades - be 
sure to check all the mod kits that are listed on the 1st page of the 
ATOB instructions.  Also check the markings on the crystals both on the 
RF Board and the KSB2 adapter - if they are maked with a "-S" suffix, 
they are the latest.
You can check the firmware level for the base K2 easily - hold any 
button down while powering on and the MCU and KIO2 levels will be 
briefly shown in the display - the latest is 2.04r MCU and 1.09 KIO2.

If you do not remember how to disassemble the K2 to get to the headphone 
jack, take a look at https://www.qsl.net/wy3a/Replace_K2_Headphone_Jack.htm.

73,
Don W3FPR

On 8/7/2021 2:05 PM, jerry wrote:
> All,
>
>    My new K2/100 has a scratchy volume control knob.  Also, it still 
> makes noise
> at full CCW.  I suspect that the volume control mod was not done. I'll 
> be taking it
> apart to take a look.
>
>    If none of the mods were done, it might make sense to just transfer 
> the KPA100
> & KAF2 to my QRP K2, which does have the mods.  I already looked, and 
> the QRP_K2 DOES have
> the mods for installing the QRO module.
>
>   Also, the headphone jack feels a little looser on the new K2. Still 
> works fine, just
> a teensy bit looser.
>
>   The finger detent thing on the front of the tuning knob had come 
> loose - I'm guessing things out hot out there in shipping.  I stuck it 
> back on, it's not going anywhere.  But that gave me a thought - is 
> there a finger detent with a bearing out there?
>
>                        - Jerry KF6VB
>
>
>
>
>                   - Jerry KF6VB
>
>
>
>
>
>
>
>
>
> On 2021-08-06 16:47, jerry wrote:
>> All,
>>
>>   I just scored a K2/100 on Ebay.  It came in at noon today. Took me
>> a while to fabricate a power cord.
>> With inline 20A fuse, natch.  The Bird says it makes over 100W. It
>> also has the audio filter, which my K2/10 doesn't.  And the ATU.
>> Buying the K2 seemed to be the only way to get a KPA100.
>>
>>   Sometime next week, I'll take the new K2 apart and see if it has 
>> the mods.
>>
>>    I have put aside my Tiny Linear project for the moment, in favor of
>> the Alpha 78...  Even though the Tiny Linear got me an S9 report from
>> *Barcelona* on 20M SSB this morning.   800W just seems like more
>> than 65W :).
>>
>> The only trouble with the Alpha is that LOUD blower.  I do have a new
>> blower for it - got it back when
>> Alpha still stocked such things - but am not sure how much quieter a
>> new one would be.  A pair of noise
>> cancelling headphones fixes it right up though.  Blower?  What blower?
>>
>>
>>
>>                            - Jerry KF6VB
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