[BC] RFI stalls cars near Empire State Building

[R A Meuser]

The DTV master antenna's most significant side lobe is about - 6 db at 
45 to about 55 degrees or approx 2000 feet out. Other side lobes that 
would impact the area where cars are having problems are about -10 db. 
The main lobe is has .75 degree beam tilt and a gain of 12 to 19 db, 
depending on the channel. The RSS voltage for 11 significant UHF 
stations on Empire is approximately between 2 and 7 volts on the ground 
for around 2000 feet distance. This does not include the contribution of 
VHF TV stations which in general have much lower gain antennas nor does 
it include about 3 volts RSS for all the FM stations combined. Could 
there be nearly 10 volts RSS for all stations? - very possibly


Bob Tarsio wrote:
> Robert:
> 
> There is no question there are higher than the usually encountered RF 
> levels
> around Empire. But we are not talking about volts down on 34th street. 
> There
> is no question that there can be RFI around the building but I think it is
> curious that it has taken three or four years for someone to figure out 
> that
> all these problems are being caused by Empire. The DTV and analog signals
> coming from the CBS master antenna and the other stand alone antennas that
> Univision, Fox, ION and Telemundo have up there are high gain antennas
> directly very little energy albeit as a ratio to what is being directed at
> the horizon. If this is a real problem I think the car companies need to
> take a look at what they are putting in their vehicles. I don't think this
> an exclusively Empire problem.