Attenuation Construction
Posted on July 31, 2011
The most often quoted FCC Rule for AM broadcasting is 15.219, with the familiar guidelines of “3-meter antenna, etc., and 100mW to final amp…”
The most often quoted FCC Rule for AM broadcasting is 15.219, with the familiar guidelines of “3-meter antenna, etc., and 100mW to final amp…”
But every once in awhile someone mentions “the alternate rule, based on field strength measurement.”
That alternate Rule is 15.209, with this regulation:
Frequency Band .490 to 1.705 24,000mV/F(kHz) at 30-meters (about 100-feet).
For AM transmitters located INDOORS there is an extra layer of filtering that just might allow MORE than a 3-meter antenna or MORE than 100mW to the final amp…
That extra filter is the HOUSE. The house is made from construction materials consisting of wood, bricks, plaster and some metal. Therefore the house should be part of anyone’s radiation study to see what the power will look like at the edge of the property, right around 100-feet away.
How can we build a chart showing predicted attenuation figures for different kinds of houses?
