[RTTY] Noise with MMTTY...

[Don Inbody]

I use WinWarbler, but it uses MMTTY as the engine.  I always see some noise,
even when the computer is not connected to anything.  The noise shows up
both on the x/y scope and on the spectrum display right at the xcvr
frequency.  There is no noise on the rest of the scope, however.  I have
found it to be interesting that it is there, but causes no negative impact
on operations at all.

Don

Don Inbody/AD0K
QSL via LotW and eQSL

-----Original Message-----
From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com] On
Behalf Of Bob Boyd
Sent: Monday, March 22, 2004 15:02
To: cfmorris at bellsouth.net; rtty at contesting.com
Subject: Re: [RTTY] Noise with MMTTY...


Not quite sure what you're saying.  I get some amount of noise ALL the
time.  Never is the XY scope simply a dot.  Anxious to see what others
say.

Bob - NT1V



----- Original message -----
From: "Charles Morrison" <cfmorris at bellsouth.net>
To: rtty at contesting.com
Date: Mon, 22 Mar 2004 14:16:44 -0600
Subject: [RTTY] Noise with MMTTY...

This email originally started out as asking if anyone's seen noise on
their
MMTTY screens when its running, but I've since discovered something and
want
to ask a different question or opinion..

I reinstalled MMTTY 2 weeks ago to try to get rid of the
Userpara.blablalbabla error that pops up immediately following a reboot
and
starting Writelog.  Well this didn't fix, so I quit worrying about it
since
I just exit and restart Writelog and then MMTTY will start without the
error.  More on that later.

Anyway, while rushing I tried to recall everything that I had turned on
or
off and started clicking buttons.  What I noticed worried me a bit and
I've
found the culprit but am wondering how much its affecting the decode.

What I noticed was that regardless of what was plugged into the radio,
what
input settings on the mixer control was selected, what anything on the
computer was set to, was that with absolutely NOTHING connected to the
radio
or the computer, MMTTY's XY scope still showed some sort of NOISE signal.
Instead of it being a small dot in the middle, it looked as though I were
receiving static or noise or something.  If I cranked up the input, MIC
or
Line, it actually increased.  Keep in mind that there's nothing but
keyboard, mouse, power and monitor hooked to the computer.

Well, I just got to playing around with it and it's the Band Pass Filter.
Turn it off, the XY scope goes to a little dot, turn it on, and XY scope
is
active, with everything disconnected, irrelevant inputs selected (CDROM,
Speaker) etc.  Does this mean that there's additional noise in the decode
loop?  Is this going to affect my ability to decode weaker signals?
Wouldn't it be better if when there's truly no signal present that the
sound
card is not detecting something?  It would appear as though its hearing
"something" when the band pass filter is turned on, because the XY scope
is
showing movement.

What do yall think?

Charlie
KI5XP


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-- 
  Bob Boyd
  nt1v at fastmail.fm
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