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@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@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@dseven.org [dseven@dseven.org] On Behalf Of iain macdonnell -
N6ML [ar@dseven.org]
Sent: Tuesday, January 08, 2013 1:17 PM
To: Al Kozakiewicz
Cc: Eric Rosenberg; rtty@contesting.com
Subject: Re: [RTTY] RTTY Newbie Questions
On Tue, Jan 8, 2013 at 8:18 AM, Al Kozakiewicz <akozak@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
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|