Good posting using quantitative reasoning not just qualitative anecdotes. Provides a way for others to tailor it to their own particular situation. It also cites references. This I think is a model post.
David K0LUM > >The Wikipedia entry on "Voice Frequency" states: "The voiced speech >of a typical adult male will have a fundamental frequency from 85 to >180 Hz, and that of a typical adult female from 165 to 255 Hz[1][2]. >Thus, the fundamental frequency of most speech falls below the >bottom of the 'voice frequency' band" (that is, the 300 Hz to 3400 >Hz band used in telephony). "However, enough of the harmonic series >will be present for the missing fundamental to create the impression >of hearing the fundamental tone." > >So how does this apply to the K3 TXEQ settings? > >The K3 transmit equalizer has eight bands. Per the K3 manual, "The >center frequencies of the 8 audio EQ bands are 50, 100, 200, 400, >800, 1600, 2400, and 3200 Hz." Clearly, the lowest band is >irrelevant for human speech and can be knocked down to -16 dB >without losing any speech. The second band, centered at 100 Hz, >will partially cover the low end of the human male voice range, >especially for males, but as stated above, you can knock out the >primary frequency and still transmit intelligible speech because of >the harmonics of the primary frequency. It might sound a little >"tinny", but it will be fully intelligible. A female user of the K3 >might want to knock the third equalizer band all the way down to -16 >dB as well as the first two. These would be typical settings for SSB >contesting where you want to maximize the modulated signal in the >frequency band where it will have the most effect. > >If you're a fan of "broadcast quality" AM rag-chewing, you'd >definitely want to use different settings, probably "flat" except >for the lowest band for males and the lowest two bands for females. > >But, as others have said, the human ear is the best way to discern >proper TXEQ settings. You can do it yourself with a good >noise-sealing headphone set and the rig in TEST XMIT mode, or over >the air to someone who knows your voice well. > >Lew K6LMP > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
