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INSTRUCTION MANUAL
AM-741R
ACTIVE MONOPOLE ANTENNA
1912 1 E l T o ro R d
●
Si l vera do, Ca lifo rni a 9 26 76
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(9 49) 459 -96 00
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co m-p o wer. com
REV112216
6.1.2
Calibration Measurements (V
CAL
)
For this measurement, as shown in Figure 14, the RF input of the network
analyzer or spectrum analyzer/EMI receiver, along with the 10 dB
attenuator, is disconnected from the coaxial T adapter, and connected
to the AM-741 output port, and the 50 ohm terminator is connected to the
T adapter.
Measurements are made across the frequency band to be calibrated, at
logarithmically spaced intervals. Results are recorded as
V
CAL
.
FIGURE 14 -
Monopole Calibration Measurement using ECSM Method
6.1.3 Calibration
Calculations
The difference between the measurements described in 6.1.1 and 6.1.2
represents the AMPLIFIER GAIN.
AMPLIFIER GAIN = V
CAL –
V
NORM
The active antenna factor is then calculated as follows:
ACTIVE ANTENNA FACTOR = 6.02 dB - AMPLIFIER GAIN
NOTE:
The calibration results should be consistent (
±
2-3 dB) with the typical factors
given in Section 8 of this document, or with the original calibration data provided
with the antenna.
INPUT
RF
Network Analyzer
with
S-Parameter Test Set
- or -
Synthesized RF Signal Generator
and Spectrum Analyzer/Receiver
OUTPUT
RF
CALIBRATION
CAPACITOR
CAP 10 pF
10 dB
10 dB
50Ω
