[Elecraft] K3 SO2R Question

[Don Wilhelm]

Igor,

Looking at the Elecraft website for K3 Mods and application notes, it 
says "*About 09/01/09 (RF board Rev H3)  and later."
*The serial number is difficult to track because of the difference 
between kit-built and factory assembled K3s.  The ship date is the most 
significant tracking method for mods that are included.

When in doubt, consult www.elecraft.com.

73,
Don W3FPR

Igor Sokolov wrote:
> Starting what serial numbers please.
>
> 73, Igor UA9CDC
>
>   
>> All New K3s for some time have had this change made at the factory
>> before they ship.
>>
>> 73, Eric
>>
>>
>> On 3/8/2010 4:04 PM, Brett Howard wrote:
>>     
>>> http://www.elecraft.com/K3/mods/K3%20rx%20protection%20mod,%20rev%20B.pdf
>>>
>>> That document explains a mod that you should definitely make sure is
>>> in place in your radio if you're worried about this condition.  I had
>>> one of Q8 and Q9 blow in my radio after too much power came back in
>>> from another operator who told me he *WAS* staying off of 20 meter
>>> like to told him to do he was down on 14 meters!  ;)  Anyway we
>>> replaced the Q and the rig came back to life.  But if you view that
>>> document it says that when you get to +13 to +20dBm it will
>>> automatically engage the preamp for you.  +20dBm is 100mW so that
>>> would at least give you an added 10dB of protection on your way up to
>>> the 1-2W realm.
>>>
>>> ~Brett (KC7OTG)
>>>
>>>
>>>       
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