Good stuff Don! I'm concerning doing the G3RXQ mod to the KSB2 and see if that helps with the low-freq response.
73....... Don Wilhelm wrote: > > Eddy, > > It is important where you set the audio passband. Normally, there is no > lack of high frequency response with the 2.6kHz bandpass. > > Using Spectrogram to set the SSB filters, I normally recommend that you > set markers at 300 Hz and the filter width plus 200 Hz - or in your > case, 2800 Hz. Center the FL1 (OP1) passband between those markers and > try it out. With most voices and microphones, those settings are > correct, and wil work quite well for receive as well. For FL2, I use > the variable filter and set it 300 Hz less than FL1 - it is important to > measure the actual width with Spectrogram since at wide setting the > numbers shown by the K2 are usually incorrect. Set the low frequency > corner of all the SSB filter passbands at 300 Hz to maintain > intelligibility as the filters are narrowed. > > If you are 'netting' with other hams at a specific frequency, you should > check your dial calibration - if you are not tuned to the actual > frequency of the other hams (because your dial calibration is off), it > could be that your audio is OK, but you are placing your transmit > frequency a bit high or low. The K2 Dial Calibration article on my > website http://w3fpr.qrpradio.com can give you the procedure for > obtaining good dial calibration. > > If filter alignment as I have outlined does not solve your problem, you > may have a microphone that is lacking in response at the higher audio > frequencies, but the MH2 usually has a bit of boost for the highs - you > might want to see if one of the locals near you has an MH2 that you can > compare with. > > 73, > Don W3FPR > > Eddy Avila wrote: >> Happy Holidays All, >> >> Getting lousy SSB tx audio reports on K2, SN 3345. I >> did the Elecraft-approved 2.6khz bandwith and using >> the Heil MH2 mic. >> >> Specifically, I get reports I don't have enough highs >> in my tx audio. I use the Spectrograph program to >> align filters per KSB2 >> >> On K2 receive, the audio is outstanding....as good as >> my ICOM 746pro. >> >> Any help will be greatly appreciated!! >> >> > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > 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 > > -- View this message in context: http://www.nabble.com/Lousy-Tx-audio-reports-using-K2-tp14445158p14462717.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] 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
