You are correct that the QSD is essentially a band pass tracking filter. It only requires that you filter harmonic frequencies. Saturation is +3 dBm at the antenna connector with the preamp off. That is about S9 +80 dB.
Gerald Youngblood, K5SDR FlexRadio Systems Ph: 512-250-5435 Fax: 512-233-5143 Email: [EMAIL PROTECTED] Web: www.flex-radio.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Jim Lux > Sent: Tuesday, April 17, 2007 3:10 PM > To: David Queen; FlexRadio@flex-radio.biz > Subject: Re: [Flexradio] band pass/low pass > > At 10:58 AM 4/17/2007, David Queen wrote: > >If the net sum of the signals in to the A/D does not max out > its count > >this may be true, however a major overload from a signal that could > >have been blocked by a band pass and all bets are out in my > opinion. If > >a signal can cause a problem sooner or later it will. > > Actually, since the A/D comes after the QSD, there IS > essentially a bandpass filter (actually low pass, that's been > "aliased" or "translated" up to the HF input frequency). As > long as the opamps and switches don't saturate (e.g. Volts) > you'll be ok. > > > > > > _______________________________________________ > 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 Knowledge Base: http://kb.flex-radio.com/ FlexRadio > Homepage: http://www.flex-radio.com/ > > _______________________________________________ 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 Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
