I'm the one that recommended the 160 hz notch, and I am a broadcast/audio engineer. The short reason for selecting this frequency is that it tends to make the audio sound boomy which is not desirable for amateur work. It is especially troublesome because amateurs use only the bottom 3 KHz of the audio spectrum. You can't compare commercial broadcast EQ preferences with amateur operations simply because we are using different audio spectrums. For additional information regarding audio enhancements for amateur radio, please visit http://www.nu9n.com/tx.html#EQ_Setup
John w5gi -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Jeff Anderson Sent: Wednesday, March 22, 2006 10:11 AM To: FlexRadio@flex-radio.biz Subject: Re: [Flexradio] 160 hz notch I was wondering that, too (why 160 Hz?). I'd assumed it should have been either 180 Hz or 150 Hz (for the EU, etc.), if the goal was to notch out 3rd harmonic AC hum (but then, a comb filter would probably be better, rather than a simple notch). And I'm curious, too, about a 250 Hz notch. What is the theory behind that? And, if one is implemented, how narrow should the notch be? - Jeff, WA6AHL Bill Nagle <[EMAIL PROTECTED]> wrote: I've been meaning and forgetting to ask who told you the eq notch should be at 160 hz? All of my broadcast engineer friends say it should be centered around 250 hz and be around -6-10 db deep. Perhaps we should start a thread on the forum and get other pinions? Bill Nagle [EMAIL PROTECTED] _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
