Yes. The original suggestion was to swap R14 and R2 on the SSB board. That raised the input resistance and improved the mic sensitivity a great deal.
After some testing, it was decided that reducing R2 was a bad idea. Doing so could allow the Speech IC, U3, to over-drive balanced modulator U5. So leave R2 at 5.6 k. You can use any value handy from 5 to 10k for R14 to improve the mic audio level. Note that if you do that and select to attenuate the mic input level with the MENU commands (set SSBA = 1), the amount of attenuation you get won't be 10 dB any longer. Few ops seem to use the mic input attenuator anyway or, if they do, care if the attenuation is actually 10 dB. Ron AC7AC -----Original Message----- Does anyone remember a mod where a 5.6K resistor replaces the 1K resistor at R14 on the KSB2 board for increased mike gain? I cannot find my notes on this mod. I thought it was a KI6WX mod, but I can't find it in John Grebenkemper's write-ups. Thanks. Roy Morris W4WFB _______________________________________________ Elecraft mailing list Post to: [email protected] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
