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A.H. Systems Model Active Monopole Antennas

Preamplifier Alignment

Preliminary alignment is required on all manufactured active monopoles 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 dBµV reference amplitude on the spectrum analyzer.

Set the output level on the tracking generator to 72 dBµV

Connect the tracking generator to the spectrum analyzer as shown in Figure 3 and the 50Ω load

connected to the antenna signal output port (B).

Save trace as trace A.

Connect the tracking generator cable to the fixture terminated with 50Ω (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 Customer and third party inspectors. Such records

include signed off ITPs, Job cards, Nonconformance reports, Testing reports and Inspection

reports if any.

 A.H. Systems inc. – October 2005

REV A

, R

and R

Figure 1) to match the following curve (Figure 2).

Figure 1

Figure 2