[Elecraft] RE: Difference between "real" filters (FL1 thru FL4)andDSPfilters (SF1 thru SF4)

[Steven Pituch]

Sorry for the confusion.  Ron Is correct.  I just had a mental lapse there.
Steve, W2MY 

Ron said:

The K2 AGC is not audio AGC. It's derived from RF in a separate I.F. strip
dedicated to producing an AGC voltage based on the strength of the signal at
the I.F. and the AGC voltage controls the gain of the I.F. amplifier. The
AGC circuits are on the control board. NE602 mixer U1 converts the I.F.
signal to about 150 kHz. That way any BFO signal at 4.9 MHz can't get into
the AGC system. The output of the NE602 is rectified to produce the DC AGC
voltage that operates the "S" meter and which controls the gain of the
MC1350 I.F. amplifier (U12) on the RF board. 

Ron AC7AC

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