Russell,
Here is a screen shot, using DigiPan as an audio spectrum analyzer,
comparing MFSK16 (bottom half) with ROS 1 baud (top half). During the
top half of the ROS display, I sent data as six letter "N"'s.
http://home.comcast.net/~hteller/SPECTRUM.JPG
The difference between ROS and MFSK16 at idle (i.e. no data input), is
that MFSK16 has repetitive carriers in a pattern, but the ROS idle has
no repetitive pattern and when data is input, the pattern still appears
to be random. Note the additional carriers when I send six letter "N"'s
in MFSK16. It then returns to the repetitive pattern of an MFSK16 idle.
Note that the data (i.e. "N"'s created new carriers depending upon the
data. In this case, the frequency carriers are data dependent.
If ROS is just FSK144, then I expected to find a repeating pattern at
idle, but I never see one, even after letting ROS idle for a long time
in transmit.
Maybe somebody more knowledgeable than I am can interpret this better,
or perhaps make their own test.
73 - Skip KH6TY
Russell Blair wrote:
If ROS is Multi FSK now, than WHY and WHAT was the intent to call it
(SS) Spread Spectrum?, even as the FCC inplyed that the owner (Jose
Albert Nieto)called it (SS). As much as I would like to use it and
knowing that the FCC will not show up at my door, but they might send
me a letter and ask me why and to show cause why.
How that ROS has been labeled as SS, and all the others that might
have use ROS is standing back just not knowing what to do it best just
to now do anything yet.
Russell NC5O
1- Whoever said nothing is impossible never tried slamming a revolving
door!
2- A government big enough to give you everything you want, is strong
enough to take everything you have.
- Thomas Jefferson
" IN GOD WE TRUST "
Russell Blair (NC5O)
Skype-Russell.Blair
Hell Field #300
DRCC #55
30m Dig-group #693
------------------------------------------------------------------------
*From:* jose alberto nieto ros <nietoro...@yahoo.es>
*To:* digitalradio@yahoogroups.com
*Sent:* Thu, February 25, 2010 6:36:59 PM
*Subject:* Re: AW: [digitalradio] The FCC's definition of Spread Spectrum
In fact, ROS is a Multi FSK, like many other modes.
------------------------------------------------------------------------
*De:* Siegfried Jackstien <siegfried.jackstien @freenet. de>
*Para:* digitalradio@ yahoogroups. com
*Enviado:* vie,26 febrero, 2010 01:29
*Asunto:* AW: [digitalradio] The FCC's definition of Spread Spectrum
Bw lower as 3kc and fsk … like many other modes
That is what i think
So legal where 3kc wide/digital is legal so out of cw portion but in
the digiarea
Dg9bfc
Sigi
At a given time if you make a snapshot there is only one tone so bw at
a given short time in lower as 500hz
So it is narrow in a short period of time ;-) should be legal anywhere
My thoughts is all modes should be legal in any band cause hamradio is
experimental!
------------------------------------------------------------------------
*Von:* digitalradio@ yahoogroups. com [mailto: digitalradio@
yahoogroups. com ] *Im Auftrag von *max d
*Gesendet:* Donnerstag, 25. Februar 2010 20:53
*An:* digitalradio@ yahoogroups. com
*Betreff:* [digitalradio] The FCC's definition of Spread Spectrum
Part 97.3 "Definitions" defines: "SS. Spread-spectrum emissions using
bandwidth-expansion modulation emissions having designators with A, C,
D, F, G, H, J or R as the first symbol; X as the second symbol; X as
the third symbol. "
Title 47 Sec. 2.201 is the relevant section formally defining these
symbols. It can be found on the ARRL website.
For a signal to be officially considered Spread Spectrum by the FCC,
it would have to meet a very specific description, or maybe I should
say it should not meet the other specific definitions of emissions.
After my reading of 2.201, I don't think that ROS or Chip64 could be
"officially" defined as Spread Spectrum.
And, the response from the FCC doesn't provide any FCC position or
interpretation of ROS, and further says "The Commission does not
determine if a particular mode "truly" represents spread spectrum as
it is defined in the rules."
Just my thoughts,
Max
NN5L
