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.
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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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