RTTY
[Top] [All Lists]

Re: [RTTY] MMTTY RXlmsNotch setting?

To: Dave AA6YQ <aa6yq@ambersoft.com>
Subject: Re: [RTTY] MMTTY RXlmsNotch setting?
From: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Reply-to: Ian White <gm3sek@ifwtech.co.uk>
Date: Wed, 11 Feb 2009 19:53:44 +0000
List-post: <rtty@contesting.com">mailto:rtty@contesting.com>
Hello Dave

>The documentation for RXlmsNotch says "Audio frequency of Notch 1", which I
>interpret to mean the absolute audio frequency of the first notch. If this
>interpretation proves to be incorrect, let me know and I'll look into the
>MMTTY code to see what it actually does.
>
Here is a list of all the profiles, with the initial state of RXlms and 
the initial notch frequency. The only ones that seem to make sense are 
mid-way between the two tones at 2125 + 85 = 2210Hz, so I'm presuming 
that with 1275Hz mark all the notches should be positioned at 1360Hz?


Name=Standard RTTY
RXlms=0
RXlmsNotch=2136

Name=Fluttered signals
RXlms=0
RXlmsNotch=2136

Name=Fluttered signals (FIR)
RXlms=0
RXlmsNotch=2096

Name=23Hz RTTY (MTTY)
RXlms=0
RXlmsNotch=2210

Name=Multi-path
RXlms=0
RXlmsNotch=2094

Name=EU1SA
RXlms=1
RXlmsNotch=2210

Name=AA6YQ
RXlms=1
RXlmsNotch=2210

Name=hyper sensitive
RXlms=1
RXlmsNotch=2211

Name=Default
RXlms=0
RXlmsNotch=2210

Name=Return to the startup
RXlms=0
RXlmsNotch=2210

All profiles:
RXlmsNotch2=0
RXlmsTwoNotch=0






73 from Ian GM3SEK

>-----Original Message-----
>From: rtty-bounces@contesting.com [mailto:rtty-bounces@contesting.com] On
>Behalf Of Ian White GM3SEK
>Sent: Wednesday, February 11, 2009 1:03 PM
>To: rtty@contesting.com
>Cc: aa6yq@ambersoft.com
>Subject: [RTTY] MMTTY RXlmsNotch setting?
>
>
>Thanks to Dave AA6YQ for hosting the extended set of MMTTY profiles, at:
>
>www.dxlabsuite.com/winwarbler/Profiles/UserPara.ini
>
>I'm trying to edit all of these profiles for a mark frequency of 1275Hz,
>and the only parameter that isn't clear is RXlmsNotch. In the original
>file, this parameter takes various values both above and below the
>default mark frequency of 2125Hz.
>
>Should I simply use the same offsets above and below the new mark
>frequency, or is there a more subtle rationale?
>
>

-- 


_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty

<Prev in Thread] Current Thread [Next in Thread>