User's Manual

CSM System Time – GPS & LFR/HSO Verification – continued
PRELIMINARY
1X SCt4812ET Lite BTS Optimization/ATP
08/01/2001
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Table 3-21: LORAN–C Initialization/Verification
Step NoteAction
2 Verify the following LFR information (highlighted above in boldface type):
– Locate the “dot” that indicates the current phase locked station assignment (assigned by MM).
– Verify that the station call letters are as specified in site documentation as well as M X Y Z
assignment.
– Verify the S/N ratio of the phase locked station is greater than 8.
3 At the CSM> prompt, enter sources <cr> to display the current status of the the LORAN receiver.
– Observe the following typical response.
Num Source Name Type TO Good Status Last Phase Target Phase Valid
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
0 Local GPS Primary 4 Yes Good –3 0 Yes
1 LFR ch A Secondary 4 Yes
Good –2013177 –2013177 Yes
2 Not used
Current reference source number: 1
*NOTE “Timed–out” should only be displayed while the LFR is warming up. “Not–Present” or
“Faulty” should not be displayed. If the LFR does not appear as one of the sources, then configure the
LFR as a back–up source by entering the following command at the CSM> prompt:
ss 1 2
4
LORAN LFR information (highlighted above in boldface type) is usually the #1 reference source
(verified from left to right).
* IMPORTANT
If any of the above mentioned areas fail, verify:
– The LFR antenna is not obstructed or misaligned.
– The antenna pre–amplifier power and calibration twisted pair connections are intact and < 91.4 m
(300 ft) in length.
– A dependable connection to suitable Earth Ground is in place.
– The search list and PLL station for cellsite location are correctly configured .
NOTE
LFR functionality should be verified using the “source” command (as shown in Step 3). Use the
underlined
responses on the LFR row to validate correct LFR operation.
5 Close the hyperterminal window.
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