At 07:38 AM 4/13/2007, Jeff Anderson wrote: >We shouldn't forget that the flex *does* have an image (at 22 KHz), and that >there can be image rejection issues if the signal at the image frequency is >strong. I've seen images from strong stations on the Flex panadapter >display (and might have even heard one, a long time ago). In a contest >environment, with strong stations nearby, this problem could be exacerbated.
But, theoretically anyway, this can be fixed in the SDR1000... all it takes is a software mod (and a fairly simple one, to boot...). >Nulling the software image-rejection helps at the frequency you're listening >to, but image rejection worsens (on the spectrum display) as you shift the >frequency of the image signal. > >- Jeff, K6JCA > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] Behalf Of Duane - N9DG >Sent: Friday, April 13, 2007 6:17 AM >To: Tim Ellison; Ray Andrews; [EMAIL PROTECTED] >Subject: Re: [Flexradio] Radio with a computer in it vs. a computer with >aradio in it > > >--- Tim Ellison <[EMAIL PROTECTED]> wrote: > > > I totally agree. The SDR is a different beast and you can > > not use well > > established "old world" standards to compare it by. This, > > along with > > delineation of the difference between a radio with a > > computer "in it" > > rather than a computer "doing it" is also a big educational > > process that has to be pushed forward. > >This fundamental conceptual difference is indeed lost by many >out there in ham radio land. Those who try to frame Flex >radio's competition as being in the same league as the Flex >is in terms of computer integration simply haven't grasp this >key differential concept. > >The Flex models are in a league all of their own for factory >ready transceivers. The traditional "big 4" models are all >still just traditional radios with computers in them. > >Duane >N9DG > > >__________________________________________________ >Do You Yahoo!? >Tired of spam? Yahoo! Mail has the best spam protection around >http://mail.yahoo.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 Knowledge Base: http://kb.flex-radio.com/ >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 Knowledge Base: http://kb.flex-radio.com/ >FlexRadio Homepage: http://www.flex-radio.com/ James Lux, P.E. Spacecraft Radio Frequency Subsystems Group Flight Communications Systems Section Jet Propulsion Laboratory, Mail Stop 161-213 4800 Oak Grove Drive Pasadena CA 91109 tel: (818)354-2075 fax: (818)393-6875 _______________________________________________ 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 Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
