On Sat, 27 Aug 2005 10:26:57 -0500, Jim Brown wrote: >The mods are quite simple. First, change R14 from 1K to 2K. Second, >change C34 to 0.22 uF. Third, add 2.2uF in series with R15.
A correction to one of my suggested mods by Don, W3FPR, who understands the K2 in far more detail than I do, and emailed me to discuss it. The cap in series with R15 is a bad idea, for several reasons, based on the control logic for the compressor. If a cap were to be added there, it ought to be in parallel with R15, not in series, and it ought to be smaller -- perhaps about 1 uF. What both caps do is reduce modulation from breath pops and low frequency noise in your shack. Popping and low frequency boost is a common problem with directional mics used close up. Even in pro applications, we use a lot of low cut on these mics, and it is even more important to do so in communications circuits. Jim _______________________________________________ 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
