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Short Wave Sportfishing wrote:
On 05 Oct 2004 15:09:34 GMT, (Gould 0738) wrote:

All of which is a long winded way to ask have they taken into account
a localized, strong FM RFI source with their controller?

Did you happen to ask about that?

Yes, but I didn't include it in the article because it was more technical than
a lot of people would appreciate, myself included.

There is a "check sum" signal that is continuously broadcast betweeen the
transmitter and the receiver. I'm not an electronics whiz, but it was explained
to me that this allows the receiver to verify the source of the signal and
allows the transmitter to confirm that the signal is being received. The
transmitter makes a beeping noise if the confirmation signal from the receiver
should ever stop.

I surmise that in layman's terms this probably means that if a device
accidentally broadcast on the same 1 in 65,000 digital frequencies that the
transmitter uses, nothing would happen because the transmitter wouldn't be able
to
communicate with the device to "confirm" the instructions.......but that's my
asumption, not an established fact.

Well, that's sort of what I was getting at, but I was addressing an
overriding strong source signal that would blank out any input from
the controller. To wit: Anybody with a 2.4 Ghz cordless digital
telephone can't use a 2.4Ghz wireless controller in their residence
because the phone will overide, by it's very nature, the signal from
the wireless network transmitter. It's a difference of 1/2 watt vs
.001 watt.

The check sum is a method by which the receiver can verify that the
signal is being sent by the companion controller, but in the scenario
I am talking about, the receiver can't receive any commands because
the single point RFI is covering the digital signal.

A question I would ask would be: If there is an interfering signal
during a command sequence that interfers with the controller's ability
to sent the appropriate command, do the thrust/engine controllers move
to neutral or so they stay locked on the last command?

There are a host of other questions, but that is the most important
one.

I'd bet anything, they didn't think of that scenario. :)

Take care.

Tom

"The beatings will stop when morale improves."
E. Teach, 1717

All this high-tech nonsense...I can hit the dock anytime I want...eyes
open or closed.

--
We today have a president of the United States who looks like he is the
son of Howdy Doody or Alfred E. Newman, who isn't smarter than either of
them, who is arrogant about his ignorance, who is reckless and
incompetent, and whose backers are turning the United States into a pariah.

What, me worry?

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