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 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.12.0/439 - Release Date: 9/6/2006 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
