OK. If that's the case, we were barking up the wrong tree here. I've just done Spectrogram plots of band noise through the 2.7KHz filter with the DSP opened up to max. They are at www.g4ilo.com/images/usb.gif and www.g4ilo.com/images/lsb.gif if anyone is interested to look at them. They look pretty similar except the skirt widens out at about 20db down on the HF side, and there is more high frequencies getting through on LSB than USB, which I can hear. The bandwidth at -6dB down certainly looks wider than 2.4KHz.
I can't see a difference that explains why LSB and USB don't sound the same to me when monitored on-air. I've monitored the transmission using both the K2 (which isn't really a good tool for this since its opposite sideband responses aren't identical either) and the FT-817 which has a fairly wide standard SSB filter and sounds the same on either sideband. -- Julian, G4ILO QRP Station: Elecraft K3 #222; K2 #392 G4ILO's Shack: www.g4ilo.com On 17/01/2008, Greg - AB7R <[EMAIL PROTECTED]> wrote: > I think this is moot when it comes to TX. As mentioned by Bill, you can ONLY > use > the 2.7 or 2.8 for the TX filter in all modes except for AM, that requires > the 6 > kHz filter for TX (for now). Setting the BW in CONFIG for either the 2.8 or > 2.7 > filter is not altering the filter, rather it determines when that roofing > filter > turns on in relation to adjusting the DSP Filter width with the front panel > DSP > controls. If you set the 2.8 at 2.8 and adjust the DSP controls from say 3.0 > kHz > down to 2.4 kHz, the 2.8 will kick in when the DSP filter is set for 2.8. > If you set the 2.8 filter BW in CONFIG as 2.6 kHz, then the 2.8 filter will > not > come on until the DSP BW is set to 2.6 kHz. > > So if you have the 2.8 set at say FL2, then you set the TX filter as FL2 for > all > modes except AM. Setting the BW in CONFIG to a lesser value should not > affect TX. > > > ------------------------- > 73, > Greg - AB7R > Whidbey Island WA > NA-065 > K3#0009 > > On Thu Jan 17 6:04 , G4ILO sent: > > > > > > > > >Bill W4ZV wrote: > >> > >> I seriously doubt it since the 5-pole has been measured at >2.9 kHz (6 dB > >> BW). It's easy enough to check without unnecessary speculation. > >> > >Unnecessary speculation? Unnecessary as far as you are concerned, perhaps, > >but not for me. The figures quoted in the Wiki weren't obtained by measuring > >*my* filter. And I don't have the equipment to easily check it. What else > >might the "2.39KHz" mean? > > > >----- > >Julian, G4ILO K2 s/n: 392 K3 s/n: 222 > >G4ILO's Shack: www.g4ilo.com > >Zerobeat Ham Forums: www.zerobeat.net/smf > >-- > >View this message in context: http://www.nabble.com/Err-TXF-on-7.077- > tp14532160p14919276.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 > > > _______________________________________________ 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
