Test Without 2Nd Rf Generator - Wavetek IS-136 MS Operating Instructions Manual

IS-136 MS

Test without 2nd RF generator

HOW?
RESULt6 Current BER
D
RESULt7 Current RSSI
RESULt8 2nd RSSI
Fig. 10.26: MAHO test mask showing field
strength (RSSI) and bit error rate (BER) in
traffic channel (Current DTC) as well as
field strength in selected adjacent channel
(2nd DTC). While testing it is possible to
observe effect of change in level (by
RF Level field) on measured figures.
Table A
Shown RSSI Real RSSI
1 –113 dBm or less
2 –111 dBm
3 –109 dBm
4 –107 dBm
... ...
... ...
30 – 53 dBm
31 – 51 dBm or greater
RSSI and BER according to specification IS-54-B (tolerances: RSSI
BER ± ± ± ± 25%)
10-44
Set the RF level in the MAHO test mask to –60 dBm.
Enter the no. of an adjacent channel in the field 2nd DTC.
Enter the DTC RF band for 2nd RF channel.
Start the test with
{CONTIN}
remotely controlled measurement.
Decrease RF level in the MAHO test mask and look for
the test results. Increase RF level to approx. –20 dBm
and look for the test result 2nd RSSI.
End the test with
{STOP}
takes you back to the basic test mask.
{RETURN}
Test Results
Bit error rate of mobile in current DTC. Display may
only show > 0 for very small RF levels < –110 dBm
(see Table B).
RF signal level of mobile in current DTC. Display
may show 0 to 31 (see Table A).
At very high RF signal level, noise spectrum of test
set provokes "measured figures" in adjacent chan-
nel.
Shown BER Real BER (%)
Mobile-Assisted Handoff (MAHO)
. is only useful for a
{1-SHOT}
.
Table B
0 < 0.01
1 0.01 to less than 0.1
2 0.1 to less than 0.5
3 0.5 to less than 1.0
4 1.0 to less than 2.0
5 2.0 to less than 4.0
6 4.0 to less than 8.0
≥ 8.0
7
± ± ± ± 3 to ± ± ± ± 5 dB,