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Re: [RTTY] Great idea for the next 75 baud contest

To: rtty contesting <rtty@contesting.com>
Subject: Re: [RTTY] Great idea for the next 75 baud contest
From: Fabi <va2up@live.ca>
Date: Mon, 21 Sep 2015 21:41:38 -0400
List-post: <rtty@contesting.com">mailto:rtty@contesting.com>
Same here, 
2Tone does a much better job when running 75 baud. 
73

Fabi  va2up
http://va2up.weebly.com/

> Date: Mon, 21 Sep 2015 20:09:41 +0000
> From: aa5au@bellsouth.net
> To: rtty@contesting.com
> Subject: Re: [RTTY] Great idea for the next 75 baud contest
> 
> I've noticed that 2Tone is far better at decoding at 75 baud than MMTTY. 
> MMTTY doesn't work well at all at 75 baud.
> 73, Don AA5AU
>  
>       From: "Joe Subich, W4TV" <lists@subich.com>
>  To: rtty@contesting.com 
>  Sent: Monday, September 21, 2015 2:09 PM
>  Subject: Re: [RTTY] Great idea for the next 75 baud contest
>    
> 
> > The only way to prevent this is to create several new Profiles for
> > 75 baud, each from a different existing base Profile with different
> > taps and other settings. You will need to name them appropriately by
> > the baseProfile settings - Flutter 75, FIR 75, etc.
> 
> The "problem" with this is that the settings for 45.45 baud are not
> appropriate for 75 baud.  In particular, one will need more bandwidth
> for 75 baud ... profiles like the AA6YQ-FIR-512, "hyper sensitive"
> and "EU1SA" are too tight for 75 baud - particularly in the presence
> of multipath and/or selective fading.
> 
> I would expect the difference between 2-Tone decoding and MMTTY to be
> much more pronounced at 75 baud than at 45.45 baud.
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 
> On 9/21/2015 11:14 AM, Gary Senesac wrote:
> > Yeah but...
> >
> > When you create this new Profile in MMTTY you are doing more than just just 
> > changing the baud rate settings. Whatever Profile you use for your base 
> > settings will also be used for your new 75 baud Profile. If during the 
> > contest you decide that MMTTY isn't decoding well enough and want to try 
> > switching to a different Profile you will find yourself back to 45 baud!
> >
> > The only way to prevent this is to create several new Profiles for 75 baud, 
> > each from a different existing base Profile with different taps and other 
> > settings.  You will need to name them appropriately by the base Profile 
> > settings - Flutter 75, FIR 75, etc.
> >
> > This problem may be mitigated somewhat if you run multiple decode windows 
> > using either other instances of MMTTY set for 75 baud, or multiple 2Tone 
> > instances set to 75 baud with different decode parameters.
> >
> > Gary AL9A
> > Sent from my Kindle HDX
> >
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>    
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