[RTTY] Dual Peak Filter question

[WS7I]

Wish we could get Chen and Mako together and then perhaps we could get
some improvement in MMTTY.  I have now tried Chen's software on my
MacBook and it really performs and I see why he doesn't use his Hal
ST-8000 much anymore.  It would also let
me move from Writelog to N1MM which doesn't support the above hardware.

Jay WS7I

On Sat, Apr 9, 2011 at 10:52 AM, Dave AA6YQ <aa6yq at ambersoft.com> wrote:
>>>>AA6YQ comments below
>
> -----Original Message-----
> From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com]On
> Behalf Of Bill, W6WRT
> Sent: Saturday, April 09, 2011 11:55 AM
> To: rtty at contesting.com
> Subject: Re: [RTTY] Dual Peak Filter question
>
>
> ORIGINAL MESSAGE:
>
> On Sat, 9 Apr 2011 10:44:53 EDT, RLVZ at aol.com wrote:
>
>> can I
>>assume then that I'd do better during RTTY contests by  turning my K-3's
> dual
>>peak filter off" and turning on the MMTTY dual peak  filter?
>
> REPLY:
>
> I operated two contests using the MMTTY AA6YQ FIR512 dual peak filter
> and I got the impression it was not copying as well when two or more
> signals were present. I asked Dave about it and he agreed - it works
> best when only one signal is present, such as in DXing or ragchewing.
>
>>>>The "AA6YQ FIR512" profile uses MMTTY's Bandpass and Notch filters to
> approximate a matched filter, with the goal of optimizing weak signal
> decoding (and getting to know MMTTY's DSP engine). I used Moe AE4JY's
> Pathsim and Alex VE3NEA's "RTTY Compare" to determine the optimal filter
> shape.
>
>>>>After discussing this with Mako-san JE3HHT, he added a dedicated dual
> peak filter to MMTTY 1.68a that provides this filter shape. Since it's is an
> approximation of a matched filter rather than an actual matched filter,
> further improvements to MMTTY's weak signal decoding are likely possible.
>
>    73,
>
>         Dave, AA6YQ
>
>
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