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?
>
>
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