User's Manual

34
The A431 Radio Module
3.3.6. Test Equipment Settings
Before proceeding, certain controls on the test equipment must be set; some of the
settings depend of the operating band (high or low) of the device under test (DUT).
In addition, it is highly recommended that the ambient temperature during align-
ment is kept to 22° C (±1°C).
3.3.6.1. Network Analyzer (HP 8712 or equivalent)
The settings for the Network Analyzer are as follows:
• Center frequency: 450 MHz
• Span: 100 MHz
• Display: 10.0 dB/div
• Power: -20 dBm
• Markers:
— band 1: Mkr1 – 435 MHz, Mkr2 – 430 MHz, Mkr3 – 440 MHz
— band 2: Mkr1 – 445 MHz, Mkr2 – 440 MHz, Mkr3 – 450 MHz
— band 3: Mkr1 – 455 MHz, Mkr2 – 450 MHz, Mkr3 – 460 MHz
— band 4: Mkr1 – 465 MHz, Mkr2 – 460 MHz, Mkr3 – 470 MHz
Note: It is a good idea to store the instrument state for the four settings for a rapid
recall when needed.
3.3.6.2. Service Monitor (Rohde & Schwarz CMS50 or equivalent)
The setting for the receiver section check are as follows (RX-TEST):
• SET RF: 435000000 Hz (Band 1) / 445000000 Hz (Band 2) / 455000000 Hz
(Band 3) / 465000000 Hz (Band 4)
• RF LEV: -118dBm
• SINAD
• AF1: 1kHz
• MOD1: 2.5 kHz
• SCOPE MODE
• BEST RANGE
The settings for the transmitter section check (TX-TEST):
• COUNT: (should show the transmitter carrier frequency)
• POWER: (should show the transmitter carrier power)