On Tue, 2 Sep 2008 14:03:56 +0000, LANCE COLLISTER wrote: >This is GREAT NEWS for those of us who use noisy amplifiers!
There are other solutions. First, don't turn the mic gain up so high, or use so much processing(compression). 10 dB of processing is enough -- more tends to sound bad. Second, roll off the low end octaves that contribute nothing to communications. In the K3, the 50 Hz and 100 Hz filters should be all the way down. Third, use sound absorbing materials in your shack to reduce the "liveness" that amplifies the noise (and makes it difficult to copy on your speaker). Some absorption on the surfaces around the noisy fans should have a high priority. Fourth, a directional mic will reject a lot of noise. The Appendix on Audio For Ham Radio that is part of my RFI Tutorial lists a bunch of good directional mics. http://audiosystemsgroup.com/RFI-Ham.pdf Downward expansion can be a problem solver if done well, but don't hold out a lot of hope for downward expansion in DSP to solve your problem. It is notoriously difficult to get DSP to sound good with dynamics processing. 73, Jim Brown K9YC _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
