Hi James, It's been some time since I bought and installed the LPF, and since it's not something you can put in and take out easily I can't comment on whether later firmware changes have reduced high frequency artifacts. The artifacts I was hearing back then were the aliased audio around the 12 kHz D/A clock, which the LPF pretty much knocked out.
The difference when I installed the filter was subtle, but noticeable; I still have SOME hearing left in the 12 kHz range :-) I would say it's worth installing if either you hear the high frequency artifacts and they bother you, or you just want to keep your rig up-to-date with the latest mods, perhaps for resale reasons down the road. Installation is pretty straight forward. A sharp knife will do to cut the traces, I don't think you should get in there with a Dremel tool. One twitch and you could do a lot of damage. I used an Xacto knife with a new blade and it was almost disturbing how easily the traces were cut! 73 -- Joe KB8AP On Nov 15, 2010, at 7:25 AM, James Sarte wrote: > Good morning Elecrafters! > > It's been some time now since the K3 LPF add-on filter board was > released. > I've been contemplating purchasing one since its debut as I've > noticed in > the past hi-frequency DSP artifiacts, especially when listening with > headphones. However, as time passed and firmware improved, I don't > seem to > hear so many of the things I thought I heard before. Perhaps my > hearing has > changed as well - who knows? > > So, with that said - what are people's opinions now on the LPF > module? Is > it still worth the purchase? Can a noticeable difference be heard, > particularly on SSB with the filter installed? > > Finally, for those who performed the install themselves, what did > you use to > cut the two traces? Will a box cutter work or should I use a dremel > cutting > wheel? > > Tnx, > James > > -- > 73 de James K2QI > President UNARC/4U1UN > ______________________________________________________________ > 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
