Like I said in another thread, "Emergency" implies IMMEDIATE (not planned)
danger to life, limb, or property. It seems that, in your proposal, you are
PLANNING to use these frequencies instead of more appropriate ones. I would
think that you need to create (and supply) a system that is isolated from
broadcast frequencies.

Wayne-
(KC8UIO)
"Ari Silversteinn" wrote in message
...
DHS has proposed a change in scenario. They want an on locomotive alerting
system that could be commandeered and driven at, near or about a disaster
site. Everything else stays more or less the same, overbroadcasting on
local AM/FM, power off the locomotive, selective or full frequency
broadcasting, train (s) to be in motion at all times. 20-30 second
messages
that would also combine a message to be aware that a locomotive (at speed)
will be flying by the at grade crossings.

Comments?
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On Tue, 04 Oct 2005 14:33:52 GMT, Wayne P. Muckleroy wrote:

Like I said in another thread, "Emergency" implies IMMEDIATE (not planned)
danger to life, limb, or property. It seems that, in your proposal, you are
PLANNING to use these frequencies instead of more appropriate ones. I would
think that you need to create (and supply) a system that is isolated from
broadcast frequencies.

Wayne-
(KC8UIO)

It's not my call, Wayne, it's the client driving the systems.
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"Ari Silversteinn" wrote in message
...
On Tue, 04 Oct 2005 14:33:52 GMT, Wayne P. Muckleroy wrote:

Like I said in another thread, "Emergency" implies IMMEDIATE (not
planned)
danger to life, limb, or property. It seems that, in your proposal, you
are
PLANNING to use these frequencies instead of more appropriate ones. I
would
think that you need to create (and supply) a system that is isolated from
broadcast frequencies.

Wayne-
(KC8UIO)

It's not my call, Wayne, it's the client driving the systems.
--
But you've already changed it! Initially you said it was to be used at an
emergency site, and now you're saying it's to warn of a high-speed train
cometh. What the hell gives?

Ken

On Wed, 5 Oct 2005 08:12:56 +1300, Ken Taylor wrote:

It's not my call, Wayne, it's the client driving the systems.
--
But you've already changed it! Initially you said it was to be used at an
emergency site, and now you're saying it's to warn of a high-speed train
cometh. What the hell gives?

Ken

Both, there are three defined needs (today) 1) on locomotive, permanent at
grade crossing and mobile, take-to-site-and-leave.
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I think you will find that the FCC has the FINAL call on frequency band
usage. I can't see them authorizing such intrusive use of the normal
broadcast bands, especially after the broadcast industry gets wind of your
proposal.

From a technical standpoint, broadband transmission of a signal is not hard.
A simple VFO sweep of all the normal broadcast bands is all that is
required. Obviously, the appropriate modulation techniques would have to be
used for each band.

Another approach would be the use of a local (LOW power) sweeping UP/DOWN
converter. In this method, you could transmit a specific (authorized) signal
from the site. This signal would be received and detected by a local
receiver. This information would be used to modulate and rebroadcast the
signal within the vehicle. However, this would require onboard equipment.

I still think that your biggest hurdle will a legal one.

Wayne-
(KC8UIO)

"Ari Silversteinn" wrote in message
...
On Wed, 5 Oct 2005 08:12:56 +1300, Ken Taylor wrote:

It's not my call, Wayne, it's the client driving the systems.
--
But you've already changed it! Initially you said it was to be used at an
emergency site, and now you're saying it's to warn of a high-speed train
cometh. What the hell gives?

Ken

Both, there are three defined needs (today) 1) on locomotive, permanent at
grade crossing and mobile, take-to-site-and-leave.
--
Drop the alphabet for email

Wayne, KC8UIO wrote:
"I still think your biggest hurdle will be a legal one.

When life is at risk, there are no prohibitions on radio transmissions.

Disruption of all normal channels is unecessary and undesirable. Some
won`t be tuned-in and won`t immediately get the message. Nearly everyone
has eyes and ears. Sight and sound are useful to communicate.

Air horns as used on locomotives are designed to get attention. They are
heard at great distances.

Illuminated message boards are used for travel information along hiways.
They are also used for advertising on the Goodyear blimp and other
vehicles. They are towed behind airplanes.. They can be programmed by
recorded media, wire lines, and radio, even satellite.

Where I live, we have a traffic control central which monitors streets
and hiways using video cameras. It gives travel conditions and
approximate times required along various routes.. This is reported on
the illuminated displays and by radio and TV stations.

A display can`t do anything about hiways clogged when people are
stampeded by officials telling them to get out of town, other than warn
them away from the clogs.

Some people don`t have the means to get out of town. Others rush into
what becomes a huge parking jam. We don`t have room for all the vehicles
on the hiway at once. It`s a free country and we cant enforce private
access to roads and streets.

We have marked evacuation routes. Everyone can`t use them at the same
time. When they try, nobody moves anywhere fast. When officials order an
evacuation, they must also advise rail times and places of departures.
Bus schedules must be given too, to keep some of the automobile load off
overcrowded hiways. Airline information needs to be broadcast too. The
transit central`s website needs to be broadcast for internet access.

We had an "emergency broadcast system" ehich tested OK. It could be
activated for purposes besides an atom missile. We had air raid sirens
that could be used to alert people to tune-in for vital information. We
don`t need yet another untested system.

Best regards, Richard Harrison, KB5WZI

We had an "emergency broadcast system" ehich tested OK.
Best regards, Richard Harrison, KB5WZI

And another one on the way.

http://www.fcw.com/article88522-04-11-05-Print
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On Wed, 5 Oct 2005 09:27:17 -0500, Richard Harrison wrote:

Disruption of all normal channels is unecessary and undesirable. Some
won`t be tuned-in and won`t immediately get the message. Nearly everyone
has eyes and ears. Sight and sound are useful to communicate.

Air horns as used on locomotives are designed to get attention. They are
heard at great distances.

Ever hear of The Quiet Zone rulings?
--
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On Wed, 05 Oct 2005 10:08:49 GMT, Wayne P. Muckleroy wrote:

I think you will find that the FCC has the FINAL call on frequency band
usage. I can't see them authorizing such intrusive use of the normal
broadcast bands, especially after the broadcast industry gets wind of your
proposal.

They got wind. Intrusive? Matter of subjectivity. A 30 sec message that
envelopes a 3500 sided square?

From a technical standpoint, broadband transmission of a signal is not hard.
A simple VFO sweep of all the normal broadcast bands is all that is
required. Obviously, the appropriate modulation techniques would have to be
used for each band.

That's the way we see it, more or less.

Another approach would be the use of a local (LOW power) sweeping UP/DOWN
converter. In this method, you could transmit a specific (authorized) signal
from the site. This signal would be received and detected by a local
receiver. This information would be used to modulate and rebroadcast the
signal within the vehicle. However, this would require onboard equipment.

Which mat make this impractical in the short run but there has been
discussion about mandating this type of installation. I have my doubts but
then we have seat belts and airbags.

I still think that your biggest hurdle will a legal one.

Wayne-
(KC8UIO)

I agree. Thanks, Wayne.
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On Wed, 05 Oct 2005 10:08:49 GMT, Wayne P. Muckleroy wrote:

I can't see them authorizing such intrusive use of the normal
broadcast bands,

http://www.fcw.com/article88522-04-11-05-Print

*This* is intrusive.
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