TABLE 2. Theshold for perception of rf sound (ambient noise level 70- 90 db). Peak Avg Peak Peak Magnetic Power Power Electric Field Trans- Frequency, Duty Cy. Density, Density Field amp. mitter mc mw, cm2 mw, cm2 v cm turns, m A 1,310 .0015 0.4 267 14 4 B 2,982 .0004 2.1 5,250 63 17 C 425 .0038 1.0 263 15 4 D 425 .007 1.9 271 14 4 E 425 .014 3.2 229 13 3 F 425 .028 7.1 254 14 4 FIG. 4. Threshold energy as a function of frequency of electromagnetic energy (ambient noise level 70-90 db). 10000|---------|-------------|--------------| |---------|-------------|--------------| PEAK |---------|-------------|--------------| POWER |---------|-------------|-------------*| DENSITY |---------|-------------|------------*-| (mw/cm2) | | | * | |---------|-------------|---------*----| | | | * | |---------|-------------|------*-------| | | | * | | | | * | | | | * | 1000|---------|-------------*--------------| |---------|-----------*-|--------------| |---------|---------*---|--------------| | | * | | |---------|-----*-------|--------------| | * * * * * * * | | |---------|-------------|--------------| | | | | | | | | | | | | 100|---------|-------------|--------------| 200 1000 2000 3000 FREQUENCY (mc) -37-