[amsat-bb] Re: MMIC for LEO preamp?

RFI-EMI-GUY Rhyolite at NETTALLY.COM
Sat Nov 29 10:25:13 PST 2008


I can't see any reason you couldn't perform the SINAD on an AM receiver 
and probably SSB as well. The point being that when tuning a 
preamplifier for the best SINAD are you not accomplishing the same  goal 
as in using a noise source?

Edward Cole wrote:
>
> Joe,
>
> I believe that SINAD applies to sensitivity measurements on FM, only.  
> At least that is the only application I have done.  SINAD does a good 
> job of determining MDS fo a receiver, so in fact determines by reverse 
> calculations what the Noise Figure would be.  When you measure NF, 
> that can be converted to noise temperature that can be used to 
> determine MDS in dBm, so they are interelated.
>
> I think that one could use FM SINAD to charaterize the system 
> sensitivity and allow one to work calculations to obtain NF.
>
> my opinion.
>
> 73, Ed - KL7UW
>
> At 11:04 AM 11/28/2008, you wrote:
>> I have always wondered why so much discussion around noise figure
>> ignores the application of a SINAD meter in tuning receiver system
>> preamplifiers? Does not the SINAD meter accomplish the same goal without
>> having to  disable AGC etc?
>>
>> -- 
>> Joe Leikhim K4SAT
>> "The RFI-EMI-GUY"©
>>
>> "Treason doth never prosper: what's the reason?
>> For if it prosper, none dare call it treason."
>>
>> "Follow The Money"  ;-P
>>
>>
>> _______________________________________________
>> Sent via AMSAT-BB at 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
>
>
>
>

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P




More information about the AMSAT-BB mailing list