HERF Data #3 - Assassination Science

EMITTERS.
The previous studies [5-7] cited obtained information from the Government Master File (GMF)
but used only emitters with frequencies > 400 MHz. For this risk assessment, it was desirable to
cover the entire HIRF frequency spectrum. For this reason, all GMF emitters were considered
and AM, shortwave, FM, and television broadcast stations were identified using Federal
Communications Commission (FCC) databases. The emitter information from these databases
was extracted and put into the same format as the earlier acquired GMF information. Similar to
previous work with the GMF emitters, some processing was required to provide estimates for
missing parameters. Mainly, this involved site elevation, antenna height, and antenna gain.
Table 5 lists the number of emitters in the Denver and Seattle areas in each of the frequency
intervals commonly used in HIRF characterization. AM, FM, and TV stations are assumed to
have a duty factor equal to 1 so their peak and average field strengths will be identical. However,
GMF emitter information included duty factor which allowed separate calculation of average and
peak field strengths.
Unfortunately, neither the GMF nor the FCC information was totally reliable. Therefore, during
a final pass through the emitter data, in each frequency interval, the nominal field strength at a
chosen distance (100 ft) was not allowed to exceed the values, average, and peak determined in a
survey of maximum strength emitters located within the U.S.[4].
TABLE 5. NUMBER OF EMITTERS IN EACH FREQUENCY BAND IN DENVER AND
SEATTLE
Number of Emitters
Frequency Denver Seattle
500 kHz - 2 MHz 37 70
2 - 30 MHz 1 5
30 - 70 MHz 6 3
70 - 100 MHz 19 23
100 - 200 MHz 19 15
200 - 400 MHz 4 9
400 - 700 MHz 12 16
700 MHz - 1 GHz 48 32
1 - 2 GHz 31 25
2 - 4 GHz 20 44
4 - 6 GHz 20 84
6 - 8 GHz 11 51
8 - 12 GHz 29 89
12 - 18 GHz 29 74
18 - 40 GHz 19 48
9