[RTTY] 2Tone vs. MMTTY - Round 2 testing

[Don Hill AA5AU]

Bill, in today's testing I was seeing better print in MMTTY windows with slower AGC too.

Right now they are on 30 meters 10143 MHz with a very weak signal. Only getting bits and pieces on both my 80M inverted vee and
Pixel loop - both antennas are about the same right now. I don't have a "normal" 30M antenna at the moment.

Hoping the 30M signal will pick up a little more to make screenshots. This should be a good test if he does come up where I can get
some significant print before they QRT.

On suggestion from W7AY and W4TV, I have opened up my filter to 350 Hz (will try 500 hz too) with TPF on in the radio. I am also
checking with TPF off and filter set to 400 hz. BUT I CANNOT HEAR THEM AT ALL WITH TPF TURNED OFF IN THE RADIO. That doesn't mean
the decoders aren't hearing them. I'm figuring if I can't hear them, the soundcard can't hear them but that may be true. I just
don't know!

73, Don AA5AU

-----Original Message-----
From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of Bill Turner
Sent: Saturday, February 16, 2013 3:38 PM
To: RTTY Reflector
Subject: Re: [RTTY] 2Tone vs. MMTTY - Round 2 testing

ORIGINAL MESSAGE: 
On Sat, 16 Feb 2013 14:21:24 -0600, AA5AU wrote:

<snip>
>Before his signal was S9, I was experimenting with the AGC. In the 
>past, I have always used FAST AGC on RTTY, but I'm sure now that is not 
>the best setting. I read something from G3YYD, either in his documentation or in a post to the N1MM reflector, that 2Tone works
best with a slower AGC.

REPLY: 
This is interesting. I had always heard that a fast AGC was best for a carrier-type mode such as RTTY or AM. It sounds reasonable to
me that one would want to maintain a steady audio level into the decoder, but maybe that is not always true. 

Can someone explain why slower is better for 2Tone? Is this true only for 2Tone or for other decoders as well?

Many thanks,

Bill, W6WRT
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