68
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Low Band Elec Atten Path System Gain
Algorithm
Aligns low band with electronic attenuator in the signal
path and set to 0 dB.
(Option EA3)
A13 Front End 50 MHz calibrator on A16
Reference.
A9 and A10 Input attenuators
Preselector Two Point Tuning Algorithm
Aligns the YTF preselector centering near the maximum
and minimum frequency points of the YTF.
Uses the high band preamp noise as stimulus signal.
A12 YTF Preselector
or
A15 Front End
Controller
or
All Low Band
A13 Front End
High Band Nominal Path System Gain
Algorithm
Anything in Band 1
signal path
4800 MHz calibrator on A16
Reference
High Band Preamp Path System Gain Algorithm
Measures change in signal level with high band preamp
turned ON and OFF.
Input attenuator set to 30 dB.
(Options P07, P32, P44)
A11 Low Band Switch 4800 MHz calibrator on A16
Reference
A9 and A10 Input attenuators
A15 Front End Controller
High Band Preselector Bypass Path System
Gain Algorithm
A12 YTF Preselector is bypassed and amplitude of
4800 MHz calibrator measured. System gain is then
computed. (Option MPB)
SW1 and SW2, coax
switches and cabling
(Options 503, 508, 513,
526)
A15 Front End Controller
4800 MHz calibrator on A16
Reference
A9 and A10 Input attenuators
High Band Preselector Bypass Preamp Path
System Gain Algorithm (Option MPB)
A11 Low Band Switch
SW1, SW2, or SW4
Preselector Bypass
Switches
Burst Carrier Trigger Curve Fit Algorithm
Detects the level of the signal envelope before filtering
at the 22.5 MHz IF, and compares that detected level
against the trigger threshold DC level.
A2 Analog IF
Trigger Interpolation A3 Digital IF
DIF 25 Pulse Stretcher Alignment Algorithm A3 Digital IF
DIF 40 Pulse Stretcher Alignment Algorithm
Adjusts time between trigger and clock signal.
(Option B40)
A3 Digital IF
Table 2-2 Initial Alignments
Alignment Description Most Probable
Hard ware Failure
Related Hardware
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