Axcera-430B Type Acceptance Report
Test Report
February 2004
4-11
Figure 4-11. Test Setup for Measuring Radiated Emissions
Three levels were compared to the following reference level.
If all of the power of the transmitter was radiated by an isotropic radiator, the
power density at 20 meters would be:
P = Pt/4
π
R
2
= 1000/4
π
•
(20)
2
= .2 w/m
2
Using a dipole-transmitting antenna increases this by 1.64 to:
1.64 x .2 = .32 w/m
2
If a dipole-receive antenna of area 1.64 x
λ
2
/4
π
is used to receive the signal, the
received level would be:
320 mw = +25 dBm
The receive levels at –36 dBm and –51 dBm were therefore at –61 dB and –76 dB
relative to this level.
The receive levels were therefore at the relative levels shown in Table 4-9.
Table 4-9. Receive Levels
FREQUENCY
(REF = +22 dBm)
RELATIVE MEASURED LEVEL
175.25
-61 dB
179.75
-76 dB
Video
Generator
Transmitter
Under
Test
50 Ohm
Termination
20 Meters
Cut
Dipole
HP 8560E
Spectrum
Analyzer
Summary of Contents for 430B
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