A.H. Systems Model Active Monopole Antennas
Active Monopole Calibration
The antenna factor for the rod antenna shall be determined by measuring the signal transfer
characteristics of the matching device and assuming that the antenna is a short monopole with an
infinite ground plane. Set up the monopole to be calibrated and the test equipment per Figure 3.
Allow all equipment to warm up for 15 minutes.
* Also referred to as a Dummy Antenna.
Figure 3
NOTES
If the VSWR of the receiver or signal generator is low, pads may not be needed or reduced to 6 dB
or 3 dB.
With the equipment connected as shown and a 50
termination on the T-connector (A), measure
the received signal voltage V
L
in dB
V at the signal output port (B).
Leaving the RF output of the signal generator unchanged, transfer the 50
termination to the
signal output port (B) and transfer the receiver input cable to the T-connector (A). Measure the
drive signal voltage V
D
in dB
V.
Subtract V
L
from V
D
and add 6 dB to obtain the antenna factor (in dB) of the antenna.
Records providing evidence that the required final inspection and tests are carried out shall be
maintained and shall be available for review by the customer and third party inspectors. Such
records include signed off ITPs, job cards, nonconformance reports, test reports and inspection
reports, if any.
NOTE – The signal generator does not need to be calibrated, but it shall be stable. The 50
termination shall have low VSWR. The spectrum analyzer shall be calibrated and have low VSWR.
A.H. Systems inc. – Nov 2019
REV D
11
