3 Meter Antenna Data

CALCULATIONS

EMISSIONS TESTING

Individual calibration data for the log periodic antenna is supplied at appropriate distances (3, and 10 meter) to comply with various emissions test requirements. For emissions measurements, add antenna factor plus cable loss to receiver reading in dBuV to convert to field strength in dBuV/meter.

FS = Field Strength in dBuV/m

SA = Spectrum Analyzer or Receiver voltage reading

AF = Antenna Correction Factor

CL = Cable Loss in dB

IMMUNITY TESTING

For Immunity measurements, the generated electric field strength can be calculated by:

FS = Approximate Field Strength in (V/m)

P = Power in watts

g = Numeric Gain

d = Distance in meters

3 Meter Antenna Factor
Frequency (MHz)	AF (dB/m)	Gain (dBi)	Gain (Numeric)
700	25.8	1.3	1.36
800	21.6	6.7	4.70
900	22.2	7.1	5.17
1000	23.2	7.0	5.06
1250	23.7	8.5	7.02
1500	24.2	9.6	9.02
1750	25.1	10.0	10.05
2000	27.7	8.6	7.25
2500	28.2	10.0	10.05
3000	29.8	10.0	9.92
3500	30.2	10.9	12.40
4000	32.2	10.1	10.15
4500	32.5	10.8	12.09
5000	34.0	10.2	10.55
5500	33.6	11.4	13.95
6000	34.2	11.6	14.37
6500	35.1	11.4	13.87
7000	36.0	11.2	13.16
7500	36.3	11.5	14.10
8000	36.8	11.5	14.20
8500	37.4	11.4	13.92
9000	37.5	11.8	15.08
9500	37.6	12.2	16.67
10000	37.8	12.4	17.55
10500	38.1	12.6	18.01
11000	38.4	12.7	18.44
11500	38.7	12.7	18.84
12000	39.8	12.0	15.79
12500	40.1	12.1	16.26
13000	40.7	11.8	15.25
13500	40.1	12.7	18.82
14000	40.5	12.7	18.43
14500	42.0	11.5	14.15
15000	41.1	12.7	18.64
15500	39.1	14.9	31.23
16000	38.1	16.2	41.53
16500	40.3	14.3	27.03
17000	41.5	13.3	21.61
17500	42.7	12.4	17.27
18000	42.9	12.5	17.76