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.
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. 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. 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. Scott/K6IX Andrew O'Brien wrote: > Thanks Jose and Scott. > > So, my original question was related to my observations were that lowering > RF gain on my receiver did range of the waterfall. Apparently this is > related to AGC circuitry being activated . On my radio the disappearance > of weaker signals from the waterfall when a very strong stations is > received., does not get improved by turning down the RF gain. I am making > an assumption that the improvement reported as a result of turning down the > RF gain, would lead to the lost weaker signals reappearing on the > waterfall. My tests this weekend were not able to replicate this. > 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/
