[RTTY] Improving receiving performance

[charlesw_anders at bellsouth.net]

Don,
 I have to copy you with old 8bit embedded sound chip in an old laptop that I use as receive
along with the desktop soundblaster card. You come out garble ( zes-2) on the desktop but
the old card with no external mixer copies you better.
By the way I was over at MSY ( New Orleans airport ) today to pick up my new OptiBeam
12 element 4 band beam. Hope to have it up in about a month if this dang cold wx moves out!
73
charles/kk5oq
> 
> From: "Don Hill AA5AU" <aa5au at bellsouth.net>
> Date: 2007/02/16 Fri PM 07:15:55 EST
> To: <rtty at contesting.com>
> Subject: Re: [RTTY] Improving receiving performance
> 
> #1 - I usually adjust my RF gain to show between +5 to +20 and sometimes higher on 80 meters when signals are strong.
> 
> #2 - I use the default settings in MMTTY (Standard profile) most of the time and occasionally use the flutter profile on fluttery
> signals.  With KK5OQ, I sometimes have to use the ground wave profile.
> 
> #3 - I use JPS NIR-12 DSP filters on both radios.  They may not be needed for RTTY anymore with radios deploying DSP, but it
> definitely helps on the ears. All the radios I've used seem to have a small amount of low level static that would not affect RTTY
> print but is annoying in the ears for hours at a time.  They also allow me to adjust the volume of audio going to the headset
> without changing the level of the audio going to the sound card because I take my audio from the radios' PHONES jack and not the
> fixed audio from the ACC jack.
> 
> I leave the DSP turned off on the NIR filters in most cases.
> 
> I understand that Ed, W0YK uses NIR-12 units at P49X as well.
> 
> I do agree that they are probably not needed and do not necessarily improve RTTY receive.
> 
> 73, Don AA5AU
> 
> -----Original Message-----
> From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com] On Behalf Of Rudy Bakalov
> Sent: Thursday, February 15, 2007 4:39 PM
> To: rtty at contesting.com
> Subject: [RTTY] Improving receiving performance
> 
> This past WPX was my first real attempt to compete on RTTY and based on the experience I have some questions for the experts:
>    
>   1. For those of you with an Icom 7566P3s, how do you set up your receiver for optimum performance?  I did use the TBF and lowered
> the RF gain down to about S9+5.
>    
>   2. How do you configure the MMTTY decoder for maximum performance?  I have a new dual core computer that can do a lot of number
> crunching.
>    
>   3. Do you use any external DSP filters between the radio and the computer?
>    
>   Thanks,
>    
>   Rudy N2WQ
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