I dont really know... I have used a 455 kHz IF (500 kHz in reality with Collins mechanial filters) in an image rejection receiver. At this frequency it is very easy to reject the image using 2 simple RC networks. The following stages were an IF amp and product detector.
Gérard/F6EHJ ----- Original Message ----- From: "Per-Tore Aasestrand" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, October 31, 2005 12:14 PM Subject: Re: [soft_radio] What is the best way in a SDR? > Couldn't that converter also sample the 455 kHz directly? > > We are dealing with a BW of just around 10 kHz. The filtering of the > signal > is usually also quite good. Some receivers have an ultimate rejection of > out-of-band signals of more than 90dB. By choosing the sample rate > carefully, one ought to be able to avoid troublesome aliasing. Or? > > Per-Tore > > At 11:59 31.10.2005, you wrote: > > ... > >>Racal used 30 kHz because they could use a cheap 24-bit audio codec for >>the >>A/D conversion. >> >>Leon > > > > +-----------------------+------------------------------+ > | Per-Tore Aasestrand | E-mail : [EMAIL PROTECTED] | > | P.O. Box 1708 Nordnes | Voice : + 47 - 55 32 32 35 | > | N-5816 Bergen, Norway | Mobile : + 47 - 92 04 44 76 | > +-----------------------+------------------------------+ > > > > > > Yahoo! Groups Links > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
