Re: [Flexradio] Missing Selectivity ?
N3WT wrote: > Gerd, > Actually, the selectivity is very effective, more like a brick wall even at > 50hz. Have you completed all of the calibration routines?. All the I/O > cable plugs in secure? Try setting the DSP Buffer to 4096. > Could be something not right in the setup on the D44.Check the Flex > website knowledge base for setup numbers on the D44 soundcard control panel. > > John, N3WT > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Gerd Loch > Sent: Sunday, December 31, 2006 6:06 AM > To: flexradio@flex-radio.biz > Subject: [Flexradio] Missing Selectivity ? > > Hi Folks, > > everything seems to be perfect with my SDR besides that I am missing > selectivity in CW mode. I can hear signals over a frequency range of about 2 > kHz when the bandwith is set to 50 Hz. > > I have changed sw from 1.6.3 to 1.8.0 and the audio interface from Audigy 2 > ZS to D44 at the same time and remember to have heard better selectivity > before. > > Any suggestions what could be wrong? > > Gerd - DJ8AY > The main component that determines the steepness of the filters is the DSP buffer size, even at 1024 the filter is not harp on the edges, never mind anything less, stay at 2048 or higher if you care about adjacent signal rejection. -- Cecil KD5NWA www.qrpradio.com www.hpsdr.com "Sacred Cows make the best Hamburger!" Don Seglio Batuna ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Missing Selectivity ?
Gerd, Actually, the selectivity is very effective, more like a brick wall even at 50hz. Have you completed all of the calibration routines?. All the I/O cable plugs in secure? Try setting the DSP Buffer to 4096. Could be something not right in the setup on the D44.Check the Flex website knowledge base for setup numbers on the D44 soundcard control panel. John, N3WT -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Gerd Loch Sent: Sunday, December 31, 2006 6:06 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Missing Selectivity ? Hi Folks, everything seems to be perfect with my SDR besides that I am missing selectivity in CW mode. I can hear signals over a frequency range of about 2 kHz when the bandwith is set to 50 Hz. I have changed sw from 1.6.3 to 1.8.0 and the audio interface from Audigy 2 ZS to D44 at the same time and remember to have heard better selectivity before. Any suggestions what could be wrong? Gerd - DJ8AY -- next part -- ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
[Flexradio] Missing Selectivity ?
Hi Folks, everything seems to be perfect with my SDR besides that I am missing selectivity in CW mode. I can hear signals over a frequency range of about 2 kHz when the bandwith is set to 50 Hz. I have changed sw from 1.6.3 to 1.8.0 and the audio interface from Audigy 2 ZS to D44 at the same time and remember to have heard better selectivity before. Any suggestions what could be wrong? Gerd - DJ8AY -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20061231/b37e22db/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
