Thanks for the caution, Arnie. I will definitely scan my computer for
viruses and trojans after installing running loading ROS. The fact that
it already sends automatic emails makes one imagine what else might be
possible once I have configured it with my email address!
73 - Skip KH6TY
Arnaldo Coro wrote:
Dear amigos:
I am really concerned about the damage to the amateur radio hobby
generated by
a NON AMATEUR in Spain that wrote a software program for a new digital
mode that very clearly to me, without any doubts , is a FHSS
communications mode.
I wrote e-mail messages to this person, and received some very aggressive
replies from him... he even used several " bad words" in his messages
that show
that besides his very primitive knowledge of the English language _ (
he can
not communicate effectively using English, as he has demonstrated many
times
with this very poorly written postings ) he lacks the most basic
education and
ethics.
The topic we are dealing now is not, in my humble opinion, if ROS is
or is not
FHSS, it this person sent messages explaining or attempting to explain
the nature
of the ROS software, and then when faced with clear evidence that part
of the
"market" , and a signficant one indeed , to which he was aiming, could not
make use of the ROS software.
Now we are seeing on the 20 meters band, under better propagation
conditions due
to the so far sustained increase in solar activity, that Olivia users
are facing
interference from ROS users, caused by the ignorance of the Spanish
"inventor"
about amateur radio.
He replied to a senior Cuban professor, a very prestigious
telecommunications
expert, using what could be described as "foul" language, an
indication that confirmed
that he was not only answering to my advice in such a disrespectful
language.
Just to add one more element... when I asked him about the possibility
of writing
the ROS software for LINUX users, his answer was also a clear
demonstration
of his ignorance about today's world.
So, amigos at "digital radio ", my advise , and that's what I am
going to do, is to
alert ROS users of the possibility that the author of the software may
even be
attempting to use it for other purposes that are not related to
amateur radio...
After all, once you load a program of which you don't known the source
code,
into your computer, you are at the mercy of those who wrote the
computer code...
73 and DX
Arnie Coro
CO2KK
IARU Region II Area C
Emergency Coordinator
--- On *Sat, 3/6/10, John B. Stephensen /<kd6...@comcast.net>/* wrote:
From: John B. Stephensen <kd6...@comcast.net>
Subject: Re: [digitalradio] What is SS?
To: digitalradio@yahoogroups.com
Date: Saturday, March 6, 2010, 4:00 AM
The document that the author of ROS originally published,
"Introduction to ROS: The Spread Spectrum", contains a good
description of frequency-hopping spread-spectrum
(FHSS) techniques. Section 4 describes taking a 250 Hz wide mode
(MFSK16) and spreading it over 2 kHz by shifting the center
frequency in a pseuorandom sequence. The receiver changes
frequencies in the same sequence and the logic used to
detect a special tone sequence to obtain synchronization is
described in section 5. The amount of spectrum occupied increases
by a factor of 8. FHSS is one way to minimize the effects of
multipath spread but there are also other techniques that occupy
less spectrum.
Note that the author of ROS published a second doucument,"ROS
Technical Description" , that contains elements of the original
but does not mention FHSS and omits any description of how data
is mapped to tones. Users comparing the original and later
versions of the code haven't seen a difference in the transmitted
spectrum.
73,
John
KD6OZH
----- Original Message -----
*From:* Rein A </mc/compose?to=rein...@ix.netcom.com>
*To:* digitalradio@ yahoogroups. com
</mc/compose?to=digitalra...@yahoogroups.com>
*Sent:* Friday, March 05, 2010 19:16 UTC
*Subject:* [digitalradio] What is SS?
Here is a reprint that for my limited mental capacities defines
the core quite well.
I have asked Mike the author for some references, no lack of trust
though.
------------ --------- --------- --------- --------- ---------
> -----Original Message-----
> >From: n4qlb <n4...@...>
> >Sent: Mar 5, 2010 1:15 PM
> >To: ROSDIGITALMODEMGROU p...@yahoogroups. com
</mc/compose?to=ROSDIGITALMODEMGROUP%40yahoogroups.com>
> >Subject: [ROSDIGITALMODEMGRO UP] Re: How do you like ROS Now?
> >
> >Thank You for your comments Sig. Let me explain what SS is.
Spread spectrum is a method by which a bank of channels
(Frequencies) are designated between a Transmitter and
Receiver and are shared or (Frequency Hopped) to facilitate a
clear Transmisson. The Transmitter actually signals the
Receiver to Hop from one frequency to another. A good example
is a 900mhz digital cordless telephone or a 800Mhz digital
radio truncking system. (Motorla Astro). A frequency in Ham
radio consist of a 3kh wide channel. Ros does not signal a
receiver to hop outside of that channel (3 Khz) therefore it
is not SS and is just like anyother FSK mode used in the
amatuer radio service. The ease of obtaining a License in the
U.S. by people that are not technically qualified to hold one
is the main culprit regarding the controversy over new modes
such as ROS. I am confident that all variations of ROS are
perfectly legal in the U.S.
> >
>
