I was running a 24" Panadapter on each radio throughout the
Roundup. It was very obvious which signals were clean, and which
were excessively wide. I would say 5% were excessively wide. A
few were grossly wide. A number of non-rtty digital signals were
also grossly wide.
Dave Hachadorian, K6LL
Yuma, Arizona
-----Original Message-----
From: Al Kozakiewicz
Sent: Tuesday, January 08, 2013 11:39 AM
To: iain macdonnell - N6ML
Cc: Eric Rosenberg ; rtty@contesting.com
Subject: Re: [RTTY] RTTY Newbie Questions
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
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