Ralph, I wonder if the metal car, supported by insulators, develops a
charge when the
round insulators are spinning 2,000 - 3,000 RPM inside a partially
confined space?
I sure don't know what's going on...
Bryan
Ps: Early ('80's) EFI had a lot of problems because of poor shielding
and bonding.
I was surprised (age 25) at how much more resistance steel and
cast iron have
when compared to copper.
Ralph Forsythe wrote:
>On Fri, 14 Feb 2003, Bryan Savage wrote:
>
>
>
>>That sounds very interesting Ralph. RF communication with a car seems to
>>work fine up to
>>about 140-180 MPH when the S/N ratio appears to drop towards 1. I have
>>no idea what the
>>xmit power input was in these cases. I suspect it was low (1-10 W).
>>
>>Bryan
>>
>>
>
>Yeah, I'm thinking legally blast enough RF to get it through. I don't
>know why speed would affect the signal strength since that is more based
>on distance and environmental characteristics. I'm not familiar with how
>the electrical properties of a huge body of salt react with radio
>communications (other than probably reflecting it), am I missing something
>there? Could it even be static off the body of the car at speed affecting
>the transmission? Just random guesses. What about the antenna being
>pulled back away from the connection to the coax from wind drag? How were
>the vehicles were this was tested set up radio-wise?
>
>I am a former systems engineer for a paging company, and still have access
>to their toys. As I'll be at speedweek, if someone wants to rig their
>ride with comm gear I can bring the gear out and maybe help find a
>solution, since there aren't a whole lot of places to run near 180mph
>around here... :) (Plus my 4runner just doesn't get that fast, and I
>don't have a headset in the bike helmet. Oh yeah, that whole jail thing is
>a deterrent too...)
>
>I really think it's something simple that maybe just got overlooked. RF
>doesn't care about 180mph...
>
>- Ralph
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