Figure 8. Examples of measured free space SWR (interference patterns) (a) Empty anechoic chamber (b) Anechoic chamber with structure in middle axis (Crawford, 1974) (c) Anechoic chamber with some absorbers removed (Appel-Hansen, 1973) Probe x Travel 5.1. Strength of 2.6 GHz Satellite Signal Inside Houses A recent extensive measurement series by Wells and Tryon (1976), and Wells (1977) of the 2.6 GHz signal strength (from the geostationary ATS-6 satellite beacon) inside 27 single-family houses across the continental United States comes the closest to assessing a HSP that we could find in an experimental study. The penetration loss Lf was determined by making spot measurements of the field strength in two rooms at two probe heights and eight randomly chosen locations both inside and outside a house. The details of the experiment design are reported by Wells et al., (1975) in a report of limited distribution (see footnote on page 9). The loss Lf was investigated as a function of construction type, climate, elevation angle, and room position with respect to the incoming radiation. A statistical treatment of the data base revealed the following. The penetration loss for all cases was Lf = 6.3 ;+ 1.2 dB. The average loss from case-to- case varied due to the position of the room in the house by + 0.6 dB, due to the exterior construction material (e.g., wood, brick) by + 1.2 dB, and due to the insulation in ceilings and walls by + 1.6 dB. The polarization dependence was significant in that the relative horizontal component was about 1.8 dB greater than vertical. There was little change (+ 1 dB) in Lf with elevation angle U « 55° to 3°).
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