User's Manual

28 68P80801E35-B 5/1/2002
Troubleshooting EBTS System Manual - Vol 2
Generation 2 Single Channel BR Station Verification Procedures
6. The path loss through the cable and splitter system is Calfactor A + 50.
Example: R2660 reads -44dBm
HP 437B reads -50dBm
Calfactor A = -44, path loss = 6dB
7. Path loss must be determined for each Antenna cable A,B,C (see Figure 7 on
page -60). If comparable cables are used for all three, the path losses of all
three should be the same.
8. Additional power will be added to the R2660 in the sensitivity measurement
to balance out the additional path loss value.
9. Reconnect cables A,B,C (see Figure 7 on page -60) to Antenna Ports 1,2,3.
10. Set the R2660 to Frequency 810MHz and a Power level of -108dBm + path
loss.
Example: If your path loss was 6dB, set the R2660 to
-102dBm.
11. Using the MMI commands below, issue the command to put the BR into
single branch mode. If the resulting bit error rate for receiver branches 1, 2,
and 3 is less than 8.00%, the receiver has passed the test.
field> ppc -orxch1 -mchn -s1
field> freq -orxch1 -f810
field> enable -orxch1 -soff
field> enable -orxch1 -dbr1 -son
field> ppr -orxch1 -a100 -r1
field> enable -orxch1 -soff
field> enable -orxch1 -dbr2 -son
field> ppr -orxch1 -a100 -r1
(skip this step if the system is configured for 2 Branch Diversity)
field> enable -orxch1 -soff
field> enable -orxch1 -db3 -son
field> ppr -orxch1 -a100 -r1