[Elecraft] K2 #6602 build: AGC question

[Don Wilhelm]

Marinus,

The most likely reason you cannot achieve 3.8 volts is because the 8 
volt regulator output is a bit low.
Set the AGC Threshold to  45% of the 8 volt regulator output BUT no 
lower than 3.65 volts.  Actually, you can set it lower, but the S-meter 
setting can get a bit 'squirrelly' at lower threshold voltages - the 
choice is yours that is why the AGC Threshold was made adjustable after 
SN 3000, it used to be a fixed value.

73,
Don W3FPR

Marinus Loewensteijn wrote:
> Assembly part I completed. All tests completed. Unfortunately in the 
> part "Setting AGC threshold" I am finding that I cannot adjust R1 for 
> a reading of 3.80 V on the DMM. The highest it will go to is 3.695 V. 
> I have checked all the resistor values in their locations and cannot 
> fault those.
>  
> Is this due to different tolreances fo the parts or have different 
> IC's been used that create this discrepancy?
>  
>