[Elecraft] Hi Current K2

[Don Wilhelm]

First question is - why are you using 4.045 MHz - that is outside the 
ham band.  Use 3.750 MHz instead.  Similarly, 10.00 MHz should be in the 
range of 10.100 to 10.150 MHz.  Also 25.012 is not a good frequency 
either, use 24.90  That is not likely to change your results with the 
HI-Cur display, but just a comment.

Your receive current draw is about normal - no problem there.

Set CAL CUR to 3.50 amps and try again with the power set to 5 watts.
If the power goes up to a high value (much above 5 watts), there is a 
problem with the power control circuits.

The lack of decent power output on 17 meters and up may be an entirely 
different problem.  Normally Hi-Cur combined with low power output 
indicates a problem in the Low Pass Filter or T4.

Please measure the voltage at the base of Q7 and Q8 during a TUNE.  It 
should be 0.6 to 0.63 volts.

73,
Don W3FPR

richard gilley wrote:
>
>   
>> I am embarrassed to say but I have a high current indication on  
>> nearly all bands during Tx. (new build and I thought I was being so  
>> so careful).
>>
>> The Rec. draws 240 ma. at 12.4 volts.  Does change slightly with  
>> option changes.
>>
>> Attempted transmitter Tune up Test Part Three page 77 has the  
>> following results:
>>
>> 4.045 Mhz   - Hi Cur LCD  to P19
>> 7.099 Mhz  - Hi Cur LCD  to P19
>> 10.00 Mhz  - Hi Cur LCD  to P18
>> 14.060 Mhz  Hi Cur LCD to  P16
>> 18.090 Mhz   NO  Hi Cur LCD to P.3
>> 21.054 MHZ  No Hi Cur  LCD to P.8
>> 25.012 Mhz    NO Hi Cur  LCD to P.1
>>
>> Power set to 2W and 1 W with same indication.
>>
>> Current limit set to 2.5A.
>> Voltage on C of Q8 and Q7 at 12.4 Vdc.
>> Res, measurements page 74 all within limits.
>>
>> Changed power supply, when I noticed voltage drop and high current  
>> reading of 5 A.  No change with known good supply.
>>
>> Hints requested before I tear something.
>>
>> Best regards
>> Dick AD1G
>>
>>
>>
>>     
>
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