[Elecraft] increasing receive gain

[Wayne Burdick]

Once a K2 is assembled and aligned correctly, its overall receive gain can be increased,
if desired, by reducing the size of resistor R1 on the Control board. This resistor is
intended to set the AGC threshold to the ideal level. But it also affects the nominal gain
of the I.F. amp (MC1350), so a slightly smaller value may be preferable for some
operators. (In hindsight, we could have used a trimmer potentiometer here.) 

If you do go with a smaller value of R1, be sure to re-test receiver performance on both
quiet bands and bands with lots of noise or strong signals. Also, you'll need to readjust
your S-meter settings (CAL S HI and CAL S LO).

While there are other ways to increase overall receive gain, this method has the advantage
of not compromising receiver dynamic range. 

73,
Wayne
N6KR

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