[Hammarlund] Why 2nd RF stage?

[D C _Mac_ Macdonald]

I just know that my old National NCX-5 (2 RF amps) would get solid copy on 10m signals that were below internal receiver noise of my new Drake R-4C receiver!  Perhaps two stages operating conservatively were better than one stage running at maximum possible performance? 
 
National's ad slogan for years was "You can't work them if you can't hear them."  Definitely true for the NCX-5 and HRO and other high line National receivers.
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 


                From: Hammarlund (hammarlund-bounces at mailman.qth.net) on behalf of Brian Burns (brian at lessonsinlutherie.com)                                



                


                                



                              Sent:                Sun 11/30/14 12:15 PM                To:



                

hammarlund at mailman.qth.net

                



              



      



    



              



                



Hello All,

May I bother you with an idle curiosity question? 

What's the idea behind having two stages of RF amplification in the front
end of a receiver? Often, top of the line models have a second one. My SWAG
(scientific wild-ass guess) is that it's for better adjacent signal
handling. Surely it's not for additional gain, or is it?  

Cheers,

Brian