--- Scott Hill <[EMAIL PROTECTED]> wrote: > On both of my receivers (ICOM 736 and Kenwood > TS-2000), with AGC off, > reducing the RF gain has almost exactly the same > effect as reducing > the soundcard receive level.
If the system is operating linearly, it is the way it should work.... > My reading of the article is that turning down the > RF gain will reduce > the "distortion" on a strong signal caused by either > the AGC or any > other receiver source. I don't see that it implies > the reappearance > of weaker signals. It is usually a resource to diminish or eliminate the interference of distortion products. Of course, all comes down...IMD products shall go down even faster. > I do know that with CW you can sometimes reduce the > noise some without > reducing the CW signal by reducing the RF gain. > Other times reducing > the RF gain just reduces both the noise and the > signal by the same amount. That's the way it works... > I think that what you want to do, reduce a strong > signal only, has to > come before the RF Gain in the signal processing > chain. I'm not smart > enough to know where the AGC fits into the chain. > > In MixW if you notch a strong signal it seems to > bring the weak > signals back a tiny bit, but not much. Obviously > the MixW notch is at > the very end of the signal processing chain, to late > to help the weak > signals much. My experience is that notches help to decode the desired signal...it is better than no notch at all, and my radio has no IF notch. And sometimes, only one notch is not enough.... 73, Jose __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> 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/
