Jose,
I have already had some experience in dealing with the FCC on mode
matters and even submitted my own petition, so I am trying to use that
experience with them to give you good advice on how to get ROS allowed
over here. I want to use ROS myself on 2M EME also, but rith now I can
only use it on 70cm EME unless the FCC will allow it on 2M, so I have a
strong reason myself to see the regulations changed to allow ROS to be used.
My best advice to you is that a petition to the FCC to allow ROS (with
the necessary limitations they think are necessary to protect other
users of the bands), stands the best chance of success.
If you think this is "stupid" advice, then just ignore it, and hope that
your approach will win, but I doubt that it will, given the fact that
the FCC has already believed you in the first case and because spectral
analysis shows ROS is not the same as FMFSK16 or Olivia 32-1000, both
FSK modes where the data determines the frequency spread.
73 - Skip KH6TY
jose alberto nieto ros wrote:
If you are waste time in try demostrate ROS is a SS, i think you
are not trying help.
------------------------------------------------------------------------
*De:* KH6TY <kh...@comcast.net>
*Para:* digitalradio@yahoogroups.com
*Enviado:* vie,26 febrero, 2010 14:36
*Asunto:* Re: [digitalradio] ROS carrier pattern when idle
> jose alberto nieto ros wrote:
> I propose to moderator you will be banned if you continue
saying stupid things in this group.
Moderated for stupidity? Now that will be a first!
Good luck with trying to fool the FCC. Spectral analysis suggests ROS
really is FHSS, no matter what you now try to claim.
This picture does not lie: http://home. comcast.net/ ~hteller/
SPECTRUM. JPG
Too bad - ROS is a fun mode and I cannot use it in USA except on UHF.
I have only tried to help find a way for US hams to use ROS. It will
be an honor to be banned for my stupidity! :-) Please go ahead as you
wish.
73, Skip KH6TY SK
jose alberto nieto ros wrote:
My friend, one thing is what i wrote, and other different is what ROS is.
If recommend you waste your time in doing something by Ham Radio,
instead of criticism ROS.
I propose to moderator you will be banned if you continue
saying stupid things in this group.
------------------------------------------------------------------------
*De:* KH6TY <kh...@comcast. net>
*Para:* digitalradio@ yahoogroups. com
*Enviado:* vie,26 febrero, 2010 13:18
*Asunto:* Re: [digitalradio] ROS carrier pattern when idle
> If MFSK16 was randomized would it magically become spread-spectrum?
Alan, sorry I forgot to reply to this question.
The answer is yes, but only if the following three conditions are ALL
met (from the ROS documentation) :
1. The signal occupies a bandwidth much in excess of the minimum
bandwidth necessary to send the information.
2. Spreading is accomplished by means of a spreading signal, often
called a code signal, which is independent of the data.
3. At the receiver, despreading (recovering the original data) is
accomplished by the correlation of the received spread signal with a
synchronized replica of the spreading signal used to spread the
information.
Standard modulation schemes as frequency modulation and pulse code
modulation also spread the spectrum of an information signal, but
they do not qualify as spread-spectrum systems since they do not
satisfy all the conditions outlined above.
Looking at the comparison between ROS and MFSK16, http://home.
comcast.net/ ~hteller/ SPECTRUM. JPG, it is easy to see that MFSK16
is not FHSS, but ROS definitely is.
Another thing that a petition should include is a requirement that
ROS only be used BELOW the phone segments and ABOVE the narrowband
data segments. On 20m, that means only between 14.1 and 14.225,
because ROS is so wide.
BTW, this same issue came up during the "regulation by bandwidth"
debate when the ARRL HSMM (High Speed MultiMedia) proponents wanted
to allow wideband, short timespan, signals everywhere with the
argument that they last such a short time on any given frequency that
they do not interfere, but the fallacy to that argument is that when
you get a multitude of HSMM signals on at the same time, all together
they can ruin communication for narrow modes, like PSK31.
The other problem is that SHARING of frequencies requires that users
of one mode be able to communicate with users of another mode in the
same space so QRL or QSY can be used. It was realized that only CW
used by both parties would make this possible. ROS does not work well
in a crowded environment or with wideband QRM, so it must find a home
relatively clear of other mode QRM. This is just another job the FCC
must do in order to be sure a new mode does not create chaos. It has
already been shown that leaving that up just to hams does not work,
and the strongest try to take over the frequencies.
upper
73 - Skip KH6TY
Alan Barrow wrote:
If MFSK16 was randomized would it magically become spread-spectrum?