[Elecraft] K2 Assembly Question

[Dave Andrus]

DW:

The exact thing happened to me.  Elecraft tech support suggested  
measuring the output of the 8-volt regulator.  Mine was 7.56 volts.   
Replaced it, even though that isn't considered "bad" by the mfr's  
specs, and then I could easily set mine to 3.80 volts.  Interestingly,  
the replacement regulator gives 8.2 volts.   Also make sure that your  
RF gain control is set per the test requirement (I think it wanted  
full clockwise).  Try turning that knob from full CW to full CCW and  
make sure that you can see the AGC voltage varying.  That's a quick  
check for your wiring to the pot.

Most likely, your 8v regulator is being too miserly.

73,

Dave K7DAA

http://www.k7daa.com


On Feb 20, 2008, at 6:39 AM, Don Wilhelm wrote:

> DW,
>
> Check the 8 volt regulator output (ControlBoard U4 upper leg).  If  
> that is less than 7.6 volts, you may want to replace the regulator.   
> It may help with both problems.  BUT if your 8 volt regulator output  
> is OK, then you should look for the component(s) that have the wrong  
> value.
>
> 73,
> Don W3FPR
>
> DW Holtman wrote:
>> Hello,
>>
>> I'm in the middle of building a K2, S/N 6412.
>>
>> I have a couple of questions, hopefully some of the knowledgeable  
>> Elecraft people on this forum can help.
>>
>> While doing the Alignment and test Part 1, I had a couple of  
>> readings that were not in specs.
>>
>> 1. Page 48, Setting the AGC Threshold, the manuals calls for  
>> adjusting  R-1 for a reading of 3.80VDC on pin 5 of U2. The highest  
>> R1 would adjust to is 3.60VDC.
>>
>> 2.  Page 48 Bargraph Current test. The manual calls for a current  
>> reading of 0.16 to 0.18. My K2 reads 0.25 amps. That is quite a bit  
>> higher than what is called for.
>>
>> Any suggestions? Are these readings anything to worry about?
>>
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