"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.
--
Drop the alphabet for email

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

Is this guy done, now?

"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?
--
Drop the alphabet for email

On Mon, 10 Oct 2005 06:10:28 GMT, Wayne P. Muckleroy wrote:

Is this guy done, now?

We were until you reopened the thread, Wayne.

duh.
--
Drop the alphabet for email