[RTTY] Improving receiving performance

[Don Hill AA5AU]

#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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