Skip,
"since there is no way to cross-communicate to resolve mutual interference."
This is a very interesting topic. I have been a software engineer for over 35
years and have heard there is "no way" a lot of times only to come up with a
solution a few days later either by myself or others on my team.
It seems to me that the problem of cross-communication can be solved by using
an already used technique via RSID. RSID is fast becoming a defacto standard.
Maybe we can solve this by modifying the RSID protocol. Currently we are using
it to just let others know what mode we are in. Maybe more information can be
put in the the RSID packet, for example, Call sign and some reserved bits for
the purpose of QSY. Like codes that mean, please QSY, this frequency is already
in use and many other codes that can be expanded for this use.
Hey guys, come on, there are a lot of smart people and great problem solvers on
this reflector who can expand this protocol or come up with a solution. Let's
use our brains and solve this problem for the good of the hobby. I am ONLY
making and example for the purpose of brain storming. RSID expansion may or may
not be a good idea. Do not take my RSID packet expansion as what we should do
but as a point of discussion on how to solve a problem. That's the real point
here. Let's take my simplistic example as start and let's go from here. Let's
not get bogged down on who is right and who is wrong, who has the better mode
and it is just too hard of a problem to solve.
Warren - K5WGM
--- On Mon, 3/8/10, KH6TY <kh...@comcast.net> wrote:
From: KH6TY <kh...@comcast.net>
Subject: Re: [digitalradio] 1976 FCC - Delete all Emission Types from Part 97
To: digitalradio@yahoogroups.com
Date: Monday, March 8, 2010, 8:14 AM
Trevor,
The problem with such a regulation is that, unless CW is required as a
common mode, there is no way for a phone QSO, being able to request an
interfering digital signal to QSY. Our frequencies are shared, and
accidental transmission on existing QSO's in unavoidable, but the
mitigation is the ability for the user of one mode to be able to
communicate with the user of another mode. The problem already exists
between digital operators, but the regulations were written long ago
when essentially there was only phone and CW and everyone was required
to know CW.
I don't know what the solution to the current problem is, but the
problem with solely "regulation by bandwidth" is NOT a solution,
especially between phone and digital, since there is no way to
cross-communicate to resolve mutual interference. This is why the ARRL
"regulation by bandwidth" petition to the FCC was withdrawn after
already once being denied by the FCC. There have been arguments that
bandwidth-only regulation works in other countries (perhaps with less
ham population density), but it definitely will not work here. That is
why legal separation between data and phone has been maintained at all
costs, and data kept separate from phone. CW usage may be declining,
and therefore using less space, leaving more for digital modes to use,
but use of digital modes is still very small compared to CW and phone.
Since it is possible to create a digital mode that is very spectrum
inefficient for the benefit it brings, there will probably have to be a
future restriction of digital mode bandwidths in proportion to the need
and benefits of the mode. Digital modes will probably have to
restricted by bandwidth in the future, but there still needs to be a
"common language" for frequency use mitigation.
73 - Skip KH6TY
Trevor . wrote:
Following the recent discussions about the US license restrictions
I was looking through the archive of QST mags at www.arrl.org
On April 22, 1976 the FCC introduced Docket 20777, the QST report (page
June 1976) says
"Rather than further complicate the present rules," the Commission
said, "with additional provisions to accomodate the petitioners'
requests, we are herein proposing to delete all references to specific
emission types in Part 97 of the Rules. "We propose, instead," the
Commission continued, "to replace the present provisions with
limitations on the permissible bandwidth which an amateur signal may
occupy in the various amateur frequency bands. Within the authorised
limitations any emission would be permitted."
It would seem that deletion of emission types from Part 97 is exactly
what is needed now to permit experimentation. Perhaps the FCC should be
asked to re-introduce Docket 20777
Trevor
