Re: [Flexradio] Radio with a computer in it vs. a computer with aradio in it
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/
Re: [Flexradio] Radio with a computer in it vs. a computer with aradio in it
This issue will be completely eliminated soon for both SDR-1000 and Flex 5000 series. You gotta love software radio. Bob N4HY 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. > > 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/ > > -- Robert W. McGwier, Ph.D. Center for Communications Research 805 Bunn Drive Princeton, NJ 08540 (609)-924-4600 (sig required by employer) ___ 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/
Re: [Flexradio] Radio with a computer in it vs. a computer with aradio in it
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. 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/
