A.H. Systems SAS-550-2B Manuel d'utilisation - Page 9
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A.H. Systems Model Active Monopole Antennas
CALIBRATION
Preamplifier Alignment
Preliminary alignment is required on all manufactured active monopole antennas prior to placing
the units in stock for sale. All preliminary test sheets and ITP will be maintained and a copy stored
with the unit to be placed in stock.
Turn on the equipment and allow 15 minutes for warm-up.
Set up the equipment to 50 MHz center frequency, 10 MHz Span/DIV, 2 dB/DIV amplitude, 300
kHz resolution and 80 dBV reference amplitude on the spectrum analyzer.
Set the output level on the tracking generator to 72 dBV.
Connect the tracking generator to the spectrum analyzer as shown in Figure 3 and the 50 load
connected to the antenna signal output port (B).
Save the trace as trace A.
Connect the tracking generator cable to the fixture terminated with 50 (A) and connect the
spectrum analyzer cable to the signal output port (B) per Figure 3.
Adjust the resistor pots (R
R6 adjusts high-frequency gain
R7 adjusts low-frequency gain
R8 adjusts overall gain
Verify that the low frequency cut off is below specification.
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.
A.H. Systems inc. – Nov 2019
REV D
, R
and R
Figure 1) to match the following curve (Figure 2).
6
7
8
Figure 1
Figure 2
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