If ROS did not use FHSS then only the rules that you quote would apply. The
problem is that the table in 97.305(c) authorizes SS only above 222 MHz.
The FCC rules are much more restrictive than ITU treaties. Other countries
specify only maximum occupied bandwith in their amateur radio regulations.
73,
John
KD6OZH
----- Original Message -----
From: w2xj
To: digitalradio@yahoogroups.com
Sent: Sunday, February 21, 2010 19:17 UTC
Subject: Re: [digitalradio] A closer look at ROS]
I have spent the last hour looking through part 97. I find nothing that
would prohibit ROS in the HF bands subject to adhering to those segments
where the bandwidth is allowed. In fact the rules would appear to
support such operation:
(b) Where authorized by §§ 97.305(c)
and 97.307(f) of this part, a station may
transmit a RTTY or data emission
using an unspecified digital code, except
to a station in a country with
which the United States does not have
an agreement permitting the code to be
used. RTTY and data emissions using
unspecified digital codes must not be
transmitted for the purpose of obscuring
the meaning of any communication.
When deemed necessary by a District
Director to assure compliance
with the FCC Rules, a station must:
(1) Cease the transmission using the
unspecified digital code;
(2) Restrict transmissions of any digital
code to the extent instructed;
(3) Maintain a record, convertible to
the original information, of all digital
communications transmitted
I also do not see anything in the part 97 subsection on spread spectrum
( if in fact ROS was really determined to be an SS mode) that would make
ROS non compliant.
Part 97 technical standards mostly harmonize US rules with ITU
international treaties They are written to be quite broad in order to
permit experimentation. So long as the coding technique is public and
can be received by anyone, the real restriction is based on allowable
bandwidth and power allocated for a given frequency.
John B. Stephensen wrote:
> The attachments are a good illustration why the rules should be changed.
Olivia and ROS use a similar amount of spectrum so the FCC shouldn't be calling
one legal and the other illegal based on how they were generated.
