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%3E >> >_______________________________________________> >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%3E > > > _______________________________________________> 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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Eh .. ?! .. I think I missed a logical connection somewhere .. care to elaborate?
On Dec 14, 2006, at 10:18 AM, Angelo Glorioso wrote:
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.
_______________________________________________> >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
Heard from a flight instructor: "The only dumb question is the one you DID NOT ask, resulting in my going out and having to identify your bits and pieces in the midst of torn and twisted metal."
participants (2)
-
Angelo Glorioso -
Bruce Bostwick