[amsat-bb] Re: Pre amp question

Bruce Bostwick lihan161051 at sbcglobal.net
Thu Dec 14 08:51:41 PST 2006

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 at hotmail.com;  
>> amsat-bb at amsat.org> From: al7eb at 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 at tin.it>> >To: "Steve  
>> Raas" <sraas at optonline.net>, "AMSAT-BB" <amsat-bb at 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}> >>  
>> >_________________________________________________________________> > 
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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."

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