Have you done the mod where you install the bigger L in the power leg to the AF amp?
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Julian, G4ILO Sent: Friday, August 07, 2009 8:17 AM To: [email protected] Subject: Re: [Elecraft] Variable bandwidth crystal filter Joe Subich, W4TV-4 wrote: > > > Where the capability becomes noticeable is on SSB due to the > wide steps between 2.8 KHz and 1.5 KHz and in digital modes > with the step between 2.8 KHz and 400 Hz. > In digital modes it shouldn't be an issue because you don't, in theory, need narrow filtering. In theory you can run with the AGC off because you don't have to listen to the signals and the digimode software ignores all but the bit of the passband you're interested in. In practise you can't, because the audio side doesn't seem to have the same dynamic range as the RF side of the K3. If a strong PSK31 signal comes on the air I see "ghost" images of it on the waterfall, often quite strong ones. If I back off the RF gain they disappear, but often I have to back it off far enough that I also lose the weakest signals. Yes, I have done the mod to the KIO board. And I don't think it's the sound card, because I installed an SB Live 24 for radio use and the ghosts are still present. ----- Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://n2.nabble.com/Variable-bandwidth-crystal-filter-tp3394075p3404925.htm l Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
