Standard Communications mt930b, Руководство по обслуживанию, Страница: 48 / 155

Maintenance
Page 6-16 Service Manual MT930B
IF Loop Level Measurement (RF Input –30 to –50 dBm)
Measurement Conditions:
•
Input: 1210 MHz (unmodulated) at –30 to –50 dBm (75 Ω )
•
Output: IF LOOP OUT
• AFC: OFF
• AGC: OFF
• MGC: 70 MHz IF (the point where the IF output becomes –30 dBm)
Measurement Procedure:
1. Input 1210 MHz at –30 to – 50 dBm from the signal generator, and adjust
the MGC so –30 dBm is read at the 70 MHz IF TEST terminal.
2. Connect the spectrum analyzer to the IF LOOP OUT terminal, and measure
the 70 MHz level and frequency.
Measurement Specifications:
−−−− IF Loop Level: –30 ± 2.0 dBm
−−−−
IF Loop Frequency: 70
±
0 MHz