[RTTY] RTTY Newbie Questions

[Jim W7RY]

That’s because most of us use 250 Hz filters. I don’t splatter with FSK nor 
do others. It's impossible (unless the radio is broken) to splatter when 
transmitting with FSK.

73
Jim W7RY


-----Original Message----- 
From: iain macdonnell - N6ML
Sent: Tuesday, January 08, 2013 11:12 AM
To: Al Kozakiewicz
Cc: Eric Rosenberg ; rtty at contesting.com
Subject: Re: [RTTY] RTTY Newbie Questions

Hi Al,

I disagree. I run a K3 with a 400Hz 8-pole filter. I also watch the IF
out on a waterfall, and there are many signals that have splatter that
looks like key-clix on every transition from mark to space. I can be
happily running until suddenly someone moves in 500Hz away from me and
starts splattering all over me. Obviously I'm not bothering him,
because my signal is clean. It's quite frustrating!

73,

    ~iain / N6ML


On Tue, Jan 8, 2013 at 10:39 AM, Al Kozakiewicz <akozak at hourglass.com> 
wrote:
> It was meant to be provocative.  Every complaint I've "seen"  of splatter 
> with a modern DSP generated FSK signals has been due to the complainers 
> receiver, often an artifact of the same high end DSP design that generated 
> the signal!
>
> The IC-756 Pro III, for just one example, will make it appear that strong 
> signals have splatter 2 kHz away when using a narrow filter. Broaden out 
> the filter and the "splatter" disappears!
>
> Al
> AB2ZY
>
> ________________________________________
> From: dseven at dseven.org [dseven at dseven.org] On Behalf Of iain macdonnell - 
> N6ML [ar at dseven.org]
> Sent: Tuesday, January 08, 2013 1:17 PM
> To: Al Kozakiewicz
> Cc: Eric Rosenberg; rtty at contesting.com
> Subject: Re: [RTTY] RTTY Newbie Questions
>
> On Tue, Jan 8, 2013 at 8:18 AM, Al Kozakiewicz <akozak at hourglass.com> 
> wrote:
>
>> 2- How does one monitor their own (FSK) signal to see how good or bad it 
>> is.
>>
>> **
>> A key question I would have is:  if you find out it's bad, what are you 
>> going to do about it? Buy a new radio?  The only way to tell would be an 
>> "old time" scope on the RF output of your transmitter.
>
> That strikes me as a rather odd perspective. If your signal is bad
> (splatting, causing QRM, etc,), you should:
>
> 1) STOP TRANSMITTING
> 2) Fix it
>
> There were WAY too many splattery signals in the RU, and some with
> horrible buzz and noise covering multiple kHz (probably AFSK with
> audio problems). We need to be more aware of the cleanliness of our
> RTTY signals, IMO.
>
> 73,
>
>     ~iain / N6ML
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