Mike N4QLB's claims that "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." are incorrect, in my opinion.
Amateur radio frequencies on HF bands are not channelized at 3 khz or any
other bandwidth (with the exception of 60m).
I have asked Mike to cite justification for his claim on the ROS reflector
that spreading a ~50 hz signal across 3 khz using classic spread spectrum
techniques (e.g. a pseudo-random sequence) isn't spread spectrum.
73,
Dave, AA6YQ
From: [email protected] [mailto:[email protected]] On
Behalf Of Rein A
Sent: Friday, March 05, 2010 3:16 PM
To: [email protected]
Subject: [digitalradio] What is SS?
Hello All,
I have been trying to understand from the very beginning of this
circus what the real problem was and where I could read about it,
from 3d independant sources.
Jose the programmer has done a poor job in pinning down the core
of the problem.
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.
In my searches on the internet I had seen pieces directing to Mike's
arguments but never connected the dots.
After checking with Mike N4QLB, he has been able to hear me on
ROS with a couple of hundred mW, he allowed me to post it here.
---------------------------------------------------------
> -----Original Message-----
> >From: n4qlb <n4...@...>
> >Sent: Mar 5, 2010 1:15 PM
> >To: [email protected]
<mailto:ROSDIGITALMODEMGROUP%40yahoogroups.com>
> >Subject: [ROSDIGITALMODEMGROUP] 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.
> >
> >Mike
> >N4QLB
----------------------------------------------------------
Hope this is a positive contribution to the ongoing discussions.....
73 Rein W6SZ
