Very interesting. There was no way to know from the documentation which type of equalizer the K3 has inside.
73 de Brian/K3KO On 2/7/2011 22:20, Joe Subich, W4TV wrote: > > > If one introduced say 6 db in the segment covering 2KHz and up to the > > next equalizer breakpoint, I don't see how this can mess up decoding. > > The gain increase is constant in the segment. > > No, the gain is not constant across the segment, it is tapered so that > setting two adjacent ranges to the same level creates a flat response > across the "boundary." In the case of 2125/2295 (traditional "high" > tones) setting the 1600 Hz band at 0 and the 2400 Hz band at +10 dB > will create a measurable "tilt" between the two tones ... a similar > tilt will be seen with the 915/1085 Hz tone pair for the 800/1600 Hz > bands. > > It's easy to see the behavior, simply use a stable oscillator like the > XG-2. Set the RxEQ to boost only the 2400 Hz band by +16 dB, zero the > dBV meter at 1 KHz and measure the level at 2.125 and 2.295 KHz. The > difference will be at least 2 dB (I measure 2.2 to 2.3 dB "tilt" at > both 2125/2295 and 915/1085). > > The behavior of a parametric EQ (which the K3 is) is very different > than a shelving EQ. > > 73, > > ... Joe, W4TV > > > On 2/7/2011 3:26 PM, Brian Alsop wrote: >> Joe, >> >> We very specifically singled out FSK-D for this request. No other >> digital mode would be impacted. >> >> If one introduced say 6 db in the segment covering 2KHz and up to the >> next equalizer breakpoint, I don't see how this can mess up decoding. >> The gain increase is constant in the segment. >> >> 73 de Brian/K3KO >> >> On 2/7/2011 20:17, Joe Subich, W4TV wrote: >>> >>> But you don't want the equalizer in digital modes as that messes >>> up the response and results in poorer decoding. The only change >>> that makes sense in any of the digital modes is (flat) level and >>> that can be done with CONFIG: LIN OUT. >>> >>> 73, >>> >>> ... Joe, W4TV >>> >>> >>> On 2/7/2011 2:19 PM, Brian Alsop wrote: >>>> Add "in equalizer" to the request. Right now it knows to turn it off in >>>> FSK-D. >>>> >>>> 73 de Brian/K3KO >>>> >>>> On 2/4/2011 22:41, Joe Subich, W4TV wrote: >>>>> >>>>>>> Unfortunately, one can't bump up audio output in FSK-D. >>>>> >>>>> What do you mean "can't bump up audio output in FSK-D?" The speaker >>>>> or headphone level is controllable with the AF gain and the Line Out >>>>> is controllable with the CONFIG:LIN OUT setting. >>>>> >>>>> 73, >>>>> >>>>> >>>> >>>> >>>> ----- >>>> No virus found in this message. >>>> Checked by AVG - www.avg.com >>>> Version: 10.0.1204 / Virus Database: 1435/3428 - Release Date: 02/07/11 >>>> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:Elecraft@mailman.qth.net >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> >>> >>> >>> ----- >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 10.0.1204 / Virus Database: 1435/3428 - Release Date: 02/07/11 >>> >>> >> >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 10.0.1204 / Virus Database: 1435/3428 - Release Date: 02/07/11 >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1204 / Virus Database: 1435/3428 - Release Date: 02/07/11 > > ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1204 / Virus Database: 1435/3428 - Release Date: 02/07/11 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
