[amsat-bb] Re: MMIC for LEO preamp?
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:
> 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
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Joe Leikhim K4SAT
"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