[Elecraft] QRP and getting above the noise

[David Cutter]

Dear Dr

I'm sure I heard of a filter that peaked the audio passband to enhance the 
s, c, ch etc but cannot remember where, perhaps it was in HR.  Yes, I am 
interested and if we can reduce that s+n/n ratio we can get more out of our 
QRP, particularly in noisy conditions.  I'm not hopeful, though, if it has 
been done, I would have thought the radio amateur fraternity would have 
picked it up years ago.  Something tells me it is a small peak around 
1500Hz.

David
G3UNA

----- Original Message ----- 
From: "James Duffey" <JamesDuffey at comcast.net>
To: <elecraft at mailman.qth.net>
Cc: <d.cutter at ntlworld.com>; "James Duffey" <JamesDuffey at comcast.net>
Sent: Wednesday, December 27, 2006 1:25 AM
Subject: [Elecraft] QRP and getting above the noise
>
> SSB signals need at least 10 dB and preferably 15 dB to 20 dB to be 
> copied.
 Also a
> number of years ago Ham Radio Magazine had details on a voice enhancing 
> frequency compensating network developed by NASA but I don't recall the 
> details or issue in which it appeared. I can look my Ham radios to find it 
> if you are interested though. - Dr. Megacycle KK6MC/5
> --
> James Duffey KK6MC/5
> Cedar Crest NM 87008
> DM65
>
>