Naw, they'd never do that. Maybe it is because they believe in the
rule of being of assistance to their fellow man. After more than 50
years of emergency service, military, civilian, Amateur, etc., until
you have walked in our footsteps, watch your insults.
At 08:16 AM 10/18/2007, you wrote:
Another one harping on about "emergency services" !!!
I wonder if it is because they need to feel important ?
----- Original Message -----
From: <mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]
To: <mailto:digitalradio@yahoogroups.com>digitalradio@yahoogroups.com
Sent: Thursday, October 18, 2007 3:13 PM
Subject: [digitalradio] New emcomm tool now available
Software for the Narrow Band Emergency Messaging System (NBEMS), is
now available for testing. This system maximizes the use of radio
amateurs for providing emergency communications.
The system works with most soundcard-equipped computers and is
completely contained on a "Live" CD (EMCpup), based on Puppy Linux
(2.17), flarq (1.0) and fldigi (2.0), Every effort has been made to
make the OS transparent to the user, so no Linux experience is
required. The system has been in development for the past year and
can be downloaded and burned to a CD from:
<http://www.w1hkj.com/emcpup.html>http://www.w1hkj.com/emcpup.html
under the link to the CD image. The goal of the NBEMS is just to be
able to bridge a widescale disaster area of up to 100 miles, without
any reliance on a centralized repeater network, or mailboxes, and
use as little space as possible.
NBEMS relies on the more traditional emergency message delivery and
confirmation system (i.e. in person), by a receiving radio amateur,
with message delivery by phone, Internet, cellphone SMS, or smoke
signals, so urgent messages can never lie unnoticed in an email
inbox. Since there ar e no automatically, or remotely controlled,
transmissions used, the system can legally be used on any frequency
where digital communications are allowed, but it is suggested to use
a range of frequencies where PSK63 activity usually takes place,
starting 2.5 KHz above the traditional PSK31 areas of operation on
each band. Just 2.5 KHz of spectrum will be enough space for 25
PSK63 NBEMS stations, so all stations within range, that are within
the IF passband of the typical SSB receiver, will be visible
simultaneously on the waterfall display. As a result, it is simple
for the station in the disaster area to pick a clear frequency or
QSY if requested.
PSK63 is fast enough for short messages, but if there are no
immediately adjacent stations, and conditions permit, wider PSK125
or PSK250 can be used for increased delivery speed of long messages,
attachments, or even small color images. The operator in the
disaster zone simply transmits a unique beacon signal (which contain
s his callsign). When a station outside the disaster zone (also
equipped with NBEMS) notices the beacon signal and replies, a green
diamond at each station will indicate when the two stations are
connected, and the station callsigns will be displayed
automatically. A beaconing station is easily identified by a unique
appearance of its signal on the waterfall as a series of "bursts".
Two meters, where there is little QSB compared to HF, is recommended
as the band of choice for normal emergency messaging in which a 100
mile range with small, portable, horizontally polarized, antennas is
sufficient. In mountainous regions, or over longer distances, using
larger NVIS antennas on HF can also be used, but sometimes with an
increased delivery time due to additional automatic repeat requests.
In either case, using VHF or NVIS HF, once a signal is discernable
above the noise it will generally stay that way during the
communication, so that multi-tone, weaker signal modes (which are
wider and take up much more space), are not needed to fight QSB.
Note that this is *not* an FM system, but a SSB system (for
increased range) modulated by digital audio, and the convention for
2m SSB use is upper sideband with horizontally polarized antennas,
not vertical antennas.
Regular keyboard-to-keyboard, non-emergency communications, where
error-free messaging is not essential, can be conducted with the
same software using PSK63 or PSK31 - without using flarq. Many other
keyboard-to-keyboard digital modes are also included with fldigi, as
well as a logging program, rig control program, and a geodetic computer.
To activate the NBEMS, the user simply inserts the NBEMS CD in his
computer, reboots, and follows the instructions under the Emcomm desktop icon.
Please give this system a try, encourage others to do so, and send
any comments or questions to: <mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED] .
& nbsp;
73,
NBEMS Development Team
KH6TY, Skip and W1HKJ, Dave
----------
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10/18/2007 09:54
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