User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - BS41x Configuration
TetraFlex® 7.5 Manual 2-87
o Register the RSSI on the TMA input. If step 1 and 2 has been done correctly, the
reading should be –105dBm, if the cable losses are 8dB. If the cable losses are less
than 8dB, the input levels will be higher than –105dBm. The feeder loss will be:
Feeder loss = 8-(105dBm+RSSI)/2 dB.
o Adjust with AI411 RFTL “OUT” the RSSI TMA input reading exactly half the way
down to –105dBm. For example if reading –100dBm then adjust to –102.5dBm.
o Adjust the AI411 “GAIN A” to an RSSI input level on TMA-A input of –105dBm.
o Adjust the AI411 “GAIN B” to an RSSI input level on TMA-B input of –105dBm.
Step 5: Restarting the Base Station
It is recommended to make a complete restart of the BS after the installation procedure has
finished ensuring, that a correct automatic start-up after power-down will take place.
o Turn off all the Output switches on the PS411 front plates
o Turn on all switches again
Step 6: Before the Base Station is left, always check that:
o All TR units are un-blocked (01-)
o Line by-pass switch is OFF
o No RED alarm indicators are illuminated
o Door is locked
2.7.13.4 BS41x manual frequency adjustment procedure
If the BS is operating without GPS sync. (Free run) the reference oscillator has to be checked
and adjusted one time a year.
Measure the BS41x transmitter frequency, the transmitter can be switch to CW mode for
easier measurement.
Commands to TR412
01+ ;Local blocking
02/- ;Test mode
15/CW ;CW modulation
10+ ;Start transmitter
Commands to adjust the reference oscillator:
H31 ;Display Sync status, note the DAC output value (OCXO Free Run value)
H31/SET/nn.nnn ;Set the OCXO Free Run value, range from 00.000% to 99.999%
H31/SAVE ;Save the OCXO Free Run value to flash
A change of 1% will give a frequency change about 0.1PPM