Rolling off at 150 Hz is not an issue with FT8. I haven’t had my radio long enough to really give it a good look. My reply before was based on what the other person stated with the “hump”.
I do use the USB to PC for digital and in very limited use have not had an issue except a couple of times in Fake It mode the radio did not return to correct RX frequency. Only a couple of times with R29. Haven’t had time to test R30 as I was preparing and traveling to Dayton. Dave wo2x Sent from my waxed string and tin cans. > On May 26, 2022, at 3:10 PM, Steve WB3LGC <em...@nr3i.org> wrote: > > > I asked about this same thing for my KX3 and never got any interest (or > reply). I was expecting flat from 0.01 to xxxx.0 for the K4D. Better, but > not zero point zero. > > With input from many, maybe it will happen (for KX3, too). Maybe CESSB for > the KX3 ?? > > The roll-off is also an issue for Winlink with VARA, too. > > > > 73, steve WB3LGC > > > >> On 5/26/22 13:04, Rob Sherwood wrote: >> Speaking for roll-off, there is a significant audio roll off in the analog >> output on the high end on the order of 8 dB, dependent on the selected DSP >> bandwidth. I would like to see this fixed, too. >> >> >> >> I don’t understand why there is any low-frequency roll-off in Data mode. >> >> Rob, NC0B >> >> From: elecraft...@groups.io [mailto:elecraft...@groups.io] On Behalf Of >> Maurizio I2NOY >> Sent: Thursday, May 26, 2022 9:49 AM >> To: elecraft...@groups.io >> Subject: Re: [Elecraft-K4] Zero to 500Hz noise in DATA mode >> >> Dear Grant, >> >> in data mode K4 applies filtering below about 150 Hz with some ringing on >> the cut-off frequency. >> >> I already submitted here some pictures of WSJTx waterfall of K4 and Anand >> 7000 DLE MkII. It seems that there is not any interest from anyone to >> flatten the audio curve in data mode on lower frequencies or move the >> cut-off lower than 100 Hz. >> >> If you search my posts on this group, you can see them. >> >> >> >> Best 73s, >> >> >> >> Maurizio I2NOY >> >> >> >> Il 26/05/2022 15:32, Grant Saviers - KZ1W ha scritto: >> I've finally got my K4 fully integrated in place of my Maestro/6700. The >> struggle to get enough CAT controls was finally resolved. The flexibility >> of Flex's CAT architecture was really missed. >> >> One significant RF difference immediately noted is the noise (phase noise?) >> in the DATA spectrum display with the LO bandwidth set to zero. The 6700 >> had none, at least down to a few tens of Hz. The K4 noise appears bad >> enough that WSJT will have difficulty decoding the DX and FOX stations that >> tend to play as low as 200Hz. Weak stations are already hard to see on the >> display. OTOH, the top end of the DATA chosen bandwidth (3500) seems >> cleaner than the 6700. >> >> Being a total newbie to the K4 is there a means to reduce the low frequency >> noise? Or is this a needed K4 DSP software fix? >> >> Grant KZ1W >> >> >> >> >> >> > _._,_._,_ > Groups.io Links: > You receive all messages sent to this group. > > View/Reply Online (#12977) | Reply To Group | Reply To Sender | Mute This > Topic | New Topic > Your Subscription | Contact Group Owner | Unsubscribe [rocke...@gmail.com] > > _._,_._,_ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
