User Manual

DELTANODE FIBER DAS MANUAL
©DeltaNode Solutions 2012
44
Revision 12-03
OBSERVE!
Do not forget to turn of the test tone when
you are done with your uplinks. Better
check one extra time. They will otherwise
interfere with the normal operation of the
system by causing noise to the base
station.
In this screen you should also turn RF on, set the gain to about 35 dB as a starting point and then turn on
the uplink test tone. Note the frequency of the test tone, this is the frequency you should be measuring
on your spectrum analyzer.
Turn on the spectrum analyzer, make sure it is connected to the right port on the right BIU and then find
the frequency. A reasonable span is 1 MHz and the receiver band width can be set to 30 kHz or similar.
Use the marker to measure the peak of the signal. Then go
to the next screen on the remote unit, the RF Status screen.
What we are looking for here is the Testtone Level. Note this down as well, next to the frequency of the
test tone you noted earlier.
Then check your spectrum analyzer. Assuming your testtone level is -62,6 dBm as in this example your
spectrum analyzer may show -58,2 dBm. Calculating the net gain between the RU and the BIU will then
yeld -58,2 - -62,5 = 4,3 dB. Subtract the coupler between the BIU and the radio base station which in this
example was 15 dB and we get -19,3 dB as our net gain.