Audio question K-2
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I have a k2 and the original elecraft mic. I want to use it on 75 meters and rag chew a little during the winter months. Where should the mic setting and compression setting be to produce audio that is pleasant to listen too... I'm not interested at all in sounding like a broadcaster or trying to tailor my audio to every individuals liking. But- I do get told often that it sounds a little "pinched" up. I do run my k2/100 into an amp. Any help is appreciated Tim Edmonson Captain D's Area partner-Ky 270-978-1014 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Tim,
With the Elecraft mic, an SSBA setting of 1 is normally sufficient although 2 can be used on bands where the RF gain is lower (10/12 meters). I would recommend setting the SSBC menu parameter to 3-1 for general use. If that is too much compression for ragchew groups, use 2-1. The KSB2 has excess bass response. You can change KSB2 C34 from 2.2uF to 0.47uF and C23 from 0.1uF to something in the range of .0033 to .005uF to reduce the bass response. If you have the 2.1kHz OP1 filter width, the audio may appear a bit 'pinched' on the high frequency end, but if the width is the more recent 2.4kHz, it should sound more natural. If you don't know which width you have, look at the KSB2 board to see if there are capacitors in the CB and CN positions - if you have capacitors there, the width is the older 2.1kHz. If you have an older K2 (below SN2560) it is likely that you should replace the KSB2 filter crystals unless that has already been upgraded. Careful alignment of the OP1 filter passband is also necessary for proper SSB audio response. Use Specrtogram and set markers at 300 and 2600 Hz - center the passband between those two markers. (if you have the 2.1kHz filter width, use 300 and 2300 Hz markers instead). 73, Don W3FPR On 12/5/2014 10:58 AM, Tim Edmonson wrote: > I have a k2 and the original elecraft mic. I want to use it on 75 meters and rag chew a little during the winter months. > > Where should the mic setting and compression setting be to produce audio that is pleasant to listen too... > > I'm not interested at all in sounding like a broadcaster or trying to tailor my audio to every individuals liking. > > But- I do get told often that it sounds a little "pinched" up. > > I do run my k2/100 into an amp. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Tim Edmonson
Hi Tim. My K2 had a very bad audio on transmitt until I did the modifications listed in KI6WX John's document named "Improving the Performance of the KSB2"http://folk.uio.no/sverre/LA3ZA/blog/K2/KI6WX/modifications_to_the_ksb2.pdfhttp://www.qrpproject.de/Media/pdf/SSBModsUK.pdfSome of the modifications listen has been included by Elecraft. The "Crystal Filter Bandwidth Modification" was not necessary to do on my K2.The "Improved 2nd Xtal Filter Flatness Modification" was not necessary to do on my K2.I did the "KSB2 Increased Gain Modification" as described. Please see below, it may make your K2 "wild".I did the "KSB2 Reduced Intermodulation Distortion Modification", this one seems to make wonders for the TX audio.The "PSK31 KSB2 ALC Time Constant Change" was not necessary to do on my K2. Before these modifications I already had replaced R9 with a 15 kohm resistor and inserted a 1 kohm resistor on the basis of Q1 on the KSB-module to be able to control the output power of my K2 when used with the KPA100.http://elecraft.365791.n2.nabble.com/K2-ALC-and-power-control-on-40m-SSB-in-K2-100-td5719064.html After I did the KI6WX modifications the power control problem returned, this was solved with replacing the R98 with a 1kohm resistor.http://www.elecraft.com/Apps/Power_Control_Mod.htmlhttp://mailman.qth.net/pipermail/elecraft/2003-June/020096.html Now I have a good sounding K2 and I'm able to fully control the output power. Martin Storli LA8OKAOslo, Norway ARCTICPEAK's Radio pages! http://www.arcticpeak.com/radio.htm
Fra: Tim Edmonson <[hidden email]> Til: "[hidden email]" <[hidden email]> Sendt: Fredag, 5. desember 2014 16.58 Emne: [Elecraft] Audio question K-2 I have a k2 and the original elecraft mic. I want to use it on 75 meters and rag chew a little during the winter months. Where should the mic setting and compression setting be to produce audio that is pleasant to listen too... I'm not interested at all in sounding like a broadcaster or trying to tailor my audio to every individuals liking. But- I do get told often that it sounds a little "pinched" up. I do run my k2/100 into an amp. Any help is appreciated Tim Edmonson Captain D's Area partner-Ky 270-978-1014 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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