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Re: Pre amp question



Thank GOD I am a Republican!!! :-)
 
---------------------------------------------------------If you don't ask, you will never know!!



> Date: Thu, 14 Dec 2006 00:01:23 -0900> To: ko6th_greg@hotmail.com; amsat-bb@amsat.org> From: al7eb@acsalaska.net> Subject: [amsat-bb] Re: Pre amp question> > Greg,> > Yes, you can do it by reducing the RF gain to minimum which generally opens> the AGC to max gain. Since the noise floor is not a large signal, it will> not drive the AGC very much this way. Note, do not use your s-meter for> these readings. Connect a good audio voltmeter (ideally with a good analog> scale).> > Another approach is to use a step attenuator in front of the receiver:> You set you reference on cold sky the same, then point at horizon and> adjust attenuation until the audio meter reads the same reading as cold> sky. The amount of attenuation in dB give the result. AGC does not affect> this method.> > 73's Ed - KL7UW> > At 07:48 PM 12/13/2006 -0800, Greg D. wrote:> >> >Is this test useful on a receiver where the AGC cannot be turned off? My > >FT-736 has only fast/medium/slow. No off. I would expect a reduction in > >accuracy, but is it even worth doing?> >> >Greg KO6TH> >> >> >----Original Message Follows----> >From: "i8cvs" <domenico.i8cvs@tin.it>> >To: "Steve Raas" <sraas@optonline.net>, "AMSAT-BB" <amsat-bb@amsat.org>> >Subject: [amsat-bb] Re: Pre amp question> >Date: Wed, 13 Dec 2006 20:55:50 +0100> >> >Hi Steve, N2JDQ> >> >If your receiver has the capability to switch OFF the AGC than the following> >simple test will tell you if your preamplifier connected to the actual> >antenna is working or not for you:> >> >{snip}> >> >_________________________________________________________________> >Get the latest Windows Live Messenger 8.1 Beta version. Join now. > >http://ideas.live.com> >> >_______________________________________________> >Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.> >Not an AMSAT-NA member? Join now to support the amateur satellite program!> >Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb> > > > _______________________________________________> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.> Not an AMSAT-NA member? Join now to support the amateur satellite program!> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
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