[RTTY] Best MMTTY profile for noise and weak signals?

[Jeff Blaine]

Dave,

What did you find as the "sweet spot" for the FW setting?

73, Jeff ACØC
www.ac0c.com

-----Original Message----- 
From: Dave AA6YQ
Sent: Saturday, January 15, 2011 3:17 PM
To: Jeff Blaine
Cc: rtty at contesting.com
Subject: RE: [RTTY] Best MMTTY profile for noise and weak signals?

>>>AA6YQ comments below

-----Original Message-----
From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com]On
Behalf Of Jeff Blaine
Sent: Saturday, January 15, 2011 3:58 PM
To: dezrat1242 at yahoo.com; Dick Flanagan
Cc: rtty at contesting.com
Subject: Re: [RTTY] Best MMTTY profile for noise and weak signals?

>snip<

In addition, there is some amount of power in the sidetones which - with a
tight filter - will be cut out as well and will degrade the useable SNR.

>>>Empirically, the 512-tap FIR filter consistently yields a higher decoding
accuracy for -10 db SNR RTTY than does any wider filter. This determination
was made using Moe AE4JY's Pathsim (with no multipath) and Alex VE3NEA's
RTTYCompare applications.

   73,

       Dave, AA6YQ