ANTENTOP- 01- 2014 # 018

Bridge Effect

Picture of the increasing is the same as for picture of the decreasing of MW reception. So it is the same as shown on Figures 4, 5, 6. Only the volume is increased instead decreasing as shown at the Figures.

What it depends on?

I tried to find factors that cause the typical and untypical cases in bridge behavior. I took in consideration seasons, weather, traffic, Moon cycles- but I could not.

Figure 4 Typical zone of attenuation under the bridge

At the same time of year, at the practically the same weather and traffic, today bridge did decreasing in volume of the MW radio, next day the bridge did increasing in the volume, and the next day did no influence to the reception.

I noticed that the same effect is usually observed for 3- 5 bridges in one direction. So, if one bridge did decreasing in reception so as the rule the next 3- 5 bridges also did decreasing in reception of MW radio.

If one bridge did increasing in reception so as the rule the next 3- 5 bridges also did increasing in reception of MW radio.

Figure 5 Zone of attenuation strictly under the bridge

There are some bridges that have stable effect. The bridges always did decreasing in reception of MW radio or did not influence to the reception.

However I newer did not find bridges that stable increased the radio reception in MW Band.

These effects I have observed at all cars that my family had. There were Nissan Sentra, Saab, Chevrolet Malibu. This effect I observed at our recent cars- Chevrolet Aveo and Sonic.

73! va3znw

Figure 6 Zone of attenuation at the exit out of the bridge

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