The only spurs I find in the passband on my SDR-1000 are "travelling" spurs that slowwwly migrate up and down in frequency and through the passband. These create a rising or falling get, and are very annoying when they occur. Some are as strong as -90 dB.
I understand they are related to a DC-DC converter. I'll probably send my SDR-1000 back to Flex some time for a checkout, if I can bear to part with this otherwise great rig! Guy Atkins Puyallup, WA www.sdr-1000.blogspot.com Sent from my BlackBerry® wireless handheld -----Original Message----- From: "Maarten N1DZ" <[EMAIL PROTECTED]> Date: Tue, 15 Aug 2006 00:36:06 To:[email protected] Subject: Re: [Flexradio] Spurs and Picket Fences As a follow up. I did a short count of audible birdies on 10m with the SDR1000 receiver terminated in a dummy load. (BTW 10M is the IF for most of my transverters.) A scan from 28.000 to 28.250MHz netted over 40 birdies. These are audible. I only counted the ones that were 20dB above the noise floor. My TS850S that I am currently using for my transverters does not have a single birdy in this spectrum. Is this normal for the SDR1000? 73 Maarten On Mon, 14 Aug 2006 23:53:16 -0400, Dudley Hurry <[EMAIL PROTECTED]> wrote: > I guess the key word here is "see". Only in the SDR can you see the > spurs, even if you can't hear them.. Most of the spurs I see, are gone > by the time they arrive in my passband. Any radio will have some > spurs, but they only worry about the ones that can be heard. I'm sure > that > the SW can be taylored to eliminate all the spurs, but I am not sure that > you could afford to run the computer that would be fast or big enough to > run it.. > > 73, > Dudley > WA5QPZ > > > > >> On Mon, 14 Aug 2006 12:20:59 -0400, Richard Smith <[EMAIL PROTECTED]> >> wrote: >> >> > I'm new to the SDR-1000 and have a question about spurs. I've read >> the >> > reflector, and understand that right now, spur reduction has more to >> do >> > with moving the spurs out of the filter passband as opposed to >> > eliminating them. However, on the quiet upper bands with very low >> noise >> > floor, I see serious spurs on the panadapter as I tune across the >> band. >> > I can often hit frequencies where the entire spectrum lights up like a >> > picket fence and includes spurs within the filter passband as well as >> > across the rest of the 48 kHz of spectrum. On the lower frequency, >> > noisier bands, I notice similar behavior with no antenna, but don't >> > notice the spurs in normal operation once the antenna is connected and >> > the noise floor comes up. Is this normal, or do I have a problem with >> > my SDR-1000? Short of the brute-force algorithm that has been >> discussed >> > for taming the DDS, is there anyway to fix this abnormal looking >> > behavior? >> > >> > Thanks. >> > >> > Rich W1EZ >> > -------------- next part -------------- >> > An HTML attachment was scrubbed... >> > URL: >> > >> /pipermail/flexradio_flex-radio.biz/attachments/20060814/a548ca48/attachment.html >> > _______________________________________________ >> > FlexRadio mailing list >> > [email protected] >> > 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 >> > >> >> >> >> -- >> Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ >> >> >> _______________________________________________ >> FlexRadio mailing list >> [email protected] >> 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 mailing list > [email protected] > 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 > -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ _______________________________________________ FlexRadio mailing list [email protected] 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 mailing list [email protected] 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
