User's Manual Part 2

CSM System Time/GPS and LFR/HSO Verification – continued

DRAFT

SCt4812T CDMA BTS Optimization/ATP

Mar 2001

3-42

Table 3-20: LFR 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 signal to noise (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

4 LORAN–C 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.