Comtech EF Data EQ90 Series - Manual (Page 13)

Rev. 2 1–1
1
Chapter 1.
INTRODUCTION
This chapter contains an introduction, a description of the equipment, its purpose and
capabilities, and major characteristics and specifications.
1.1 Overview
This chapter provides instructions for the EQ90 Series Group Delay/Amplitude
Equalizer Assembly (Figure 1-1), herein after referred to as, “the equalizer.” Two
versions of the equalizer are manufactured:
•
Single channel unit
•
Dual channel unit
The single channel unit (D68563) and dual channel unit (D68564) can be equipped for a
70 or 140 MHz input/output signal.
The 10-section 70 MHz delay equalization PCB is contained in the internal equalizer
assembly A1 and A2. The PCB contains a switch which enables or disables the alarm
output from the equalizer due to a low IF output signal level. The switch is accessed by
removing the equalizer top cover. The cover on the internal assembly A1 or A2 is labeled
BYPASS or LVL MON.
•
In the LVL MON position, the IF output signal level is monitored. In the event,
the IF signals level falls below
-20 dBm nominal, an alarm indicated on the front panel of the equalizer and
reported to external monitor and control equipment.
•
In the BYPASS position, an alarm will result only if the internal power supply
fails.