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From: tomb@hplsla.HP.COM (Tom Bruhns)
Newsgroups: sci.electronics
Subject: Re: Hetro dining?
Message-ID: <5170090@hplsla.HP.COM>
Date: 12 Sep 90 01:07:20 GMT
References: <SQUASH.90Sep5183021@boogie.math.ufl.edu>
Organization: HP Lake Stevens, WA
Lines: 12

myers@hpfcdj.HP.COM (Bob Myers) writes:

...

>frequency (IF) prior to detection.  This improves selectivity, as narrowband
>filters (which don't have to be tunable) may be used in the IF stages, and
>the amplifiers used in these stages also benefit as they don't have to work
>at high frequencies or over wide bandwidths.

Another advantage:  since a lot of gain is generally required, this system
lets you add gain at yet-another-frequency, so that nasty parasitic
feedback paths aren't so much trouble.