Darwin, The current production K2s have a SSB filter bandwidth of 2.4 kHz - that can be easily changed to a 2.6 kHz width by changing the capacitor values (most easily done before the crystals are mounted) - Elecraft has a kit with the proper value capacitors. Proper alignment of the filter passband in the audio spectrum will also go a long way toward obtaining a 'natural sounding' audio response. In addition, those K2s that do not have proper dial calibration may sound a bit 'wimpy' on an SSB roundtable net if one just tunes it to the designated frequency and does no more fine tuning of the rest of the folks in the roundtable - the K2 dial may not read correctly unless it is properly calibrated after setting the 4 MHz reference oscillator. If you want details on how to accomplish this task, check out the K2 Dial Calibration article on my website http://w3fpr.qrpradio.com .
The older KSB2 did have a 2.1 kHz filter width which gave more SSB power when QRP. Yes, it did not give great 'broadcast sounding audio', but it is quite effective. As an aside, I can recall when the Collins 1.8 kHz SSB mechanical filter was the thing to be desired by the SSB crowd with adequate bucks to buy the filter - it gave great communications intelligibility (albiet at the expense of fidelity) - I just shake my head in wonder about how expectations have changed over the years. 73, Don W3FPR > -----Original Message----- > > I haven't used or worked a K2 on SSB but I get the impression it is not > the best audio. Seems to me the issue is not the mic, but the 2.0 KHz > SSB filter. That's pretty narrow and won't give good hi-fi (or mid-fi) > SSB. > > How hard would it be to increase the bandwidth of the SSB board's filter > to 2.6 KHz or so? I'd love that. If I want the bandwidth limited I can > do it with an outboard parametric EQ. > > - Keith KD1E - > _______________________________________________ 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
