[64539] in North American Network Operators' Group
Re: NOAA warning for rf communications
daemon@ATHENA.MIT.EDU (Scott Granados)
Mon Oct 27 12:34:15 2003
Date: Mon, 27 Oct 2003 09:31:51 -0800 (PST)
From: Scott Granados <scott@wworks.net>
To: Owen DeLong <owen@delong.com>
Cc: Roy <garlic@garlic.com>, Chris Yarnell <cdy@kooks.net>,
<nanog@merit.edu>
In-Reply-To: <2147483647.1067165107@imac-en0.delong.sj.ca.us>
Errors-To: owner-nanog-outgoing@merit.edu
Just to add, it seems that I over extended the hf band the cut off as was
correctly pointed out was 30 mhz I believe.
And if anything since friday the vhf band seems improved, 2 meters has
been quite good.
I'd say that I have not noticed any disruption although I've heard tell of
disruptions in the gps network I haven't experienced them personally.
On Sun, 26 Oct 2003, Owen DeLong wrote:
>
> It means HF in the traditional sense of the word. The cellphone issue
> is due to the use of satellite links to many cells. There is no reason
> to believe that line of sight (LOS) communications VHF and above are
> likely to be impacted by these events as long as they are not depending
> on ionospheric propogation.
>
> HF depends on ionospheric bounce. Satellites depend on the signals
> being able to penetrate the ionosphere. Both of these will be
> effected. Terrestrial microwave and VHF line of site, 802.11,
> 2.4GHz cordless phones and the like do not.
>
> Owen
> KB6MER
>
>
> --On Friday, October 24, 2003 9:31 AM -0700 Scott Granados
> <scott@wworks.net> wrote:
>
> >
> > Wouldn't 2.4 ghz fall in that range or does hf mean hf in the classical
> > sense of something on the scale of 3 to 49 mhz or so.
> >
> >
> > On Thu, 23 Oct 2003, Roy wrote:
> >
> >>
> >> According to the notice
> >>
> >> "Satellite and other spacecraft operations, power systems, high
> >> frequency communications, and navigation systems may experience
> >> disruptions over this two-week period."
> >>
> >> I think you will find that 802.11b and other terrestrial microwave LOS
> >> links don't meet any of those criteria and should be unaffected. Some
> >> small increase in the noise level may be detected.
> >>
> >> Chris Yarnell wrote:
> >>
> >> > my office experienced 802.11b weirdness (sudden bouts of 0% signal for
> >> > no apparent reason) earlier this week. i'm fully expecting more
> >> > tomorrow. :)
> >> >
> >> >
> >> >> There is a high likelihood that things like 802.11, licensed and
> >> >> unlicensed microwave links, and certainly satellite links will sustain
> >> >> interference over the next few days. I assume that everyone on the
> >> >> list is both aware, and prepared ;-)
> >> >
> >> >
> >> >
> >>
> >>
> >
>
>
>
