User Manual

INSTALLATION GUIDE
Proprietary Information
Title: BEAMER Array System-
Assembly and Operation Manual
Doc. No.: 913000100 Rev.: 00
Page: 51 of 92
Measure or estimate, according to the RF cable's vendor specifications, the RF losses over the Tx RF
cable. Typical loss for ½" cable is 0.11db/meter or about 5.5dB/50meters. (L
TX-CABLE
)
Measure or estimate the output power from the BTS up-converter at full capacity (P
BTS
)
Using G BEAMER (min)=36dB, estimate the needed output from the Tx-ABT:
Pout(ABT)=33dBm-G BEAMER +6dB+0.5dB+ LTX-CABLE
Verify that Pout(ABT)<+10dBm. If the computed Pout(ABT) is higher than the required limit, you
should use lower loss RF cable.
Estimate the Tx-ABT gain to achieve the required ABT output:
G
ABT
= Pout(ABT)-P
BTS
The maximum available G
ABT
is 30dB, reducible to 14.5dB in steps of 0.5dB.
2.8.5.2. Setting the Actual Tx-ABT Gain
The following procedure will set the actual ABT-Tx gain to achieve the required output power from
the BEAMER array (+33dBm per BEAMER module, +39dBm or 8Watts at the antenna port).
1. Using the PC or BTS interface, verify that the Tx ABT gain is set to minimum.
2. Connect the BTS up-converter output to the Tx-ABT input.
3. Set the BTS up-converter to full capacity, single carrier simulated CDMA output (if this feature is
not available from the BTS, use a commercial CDMA source, such as HP4431B - ESGD, to generate
the required signal. Note that the BEAMER power measurements are calibrated for CDMA RF
signals only).
4. Read the BEAMER power indications for each BEAMER module connected to the array. Issuing
the command read BEAMER indications (code 132), with the appropriate ICU and BEAMER
addresses does this. Output power indication is given within a range of 0-14dB above +20dBm.
5. Repeat for all four BEAMER -Tx modules integrated into the array. Compute the average output
power:
∑
=
=
4
1
4
1
i
iAV
PP
Where P
i
is the measure output power from BEAMER -Tx #i, as indicated by read BEAMER
indications command.
6. Watch for variation between the P
i
readings. The differences between the BEAMER -Tx measured
output power, for output power in the range of 26dBm<P
i
<34dBm should not differ in more than
±2dB.
7. If P
av
is less than 24dBm, increase the ABT-Tx gain by 5dB. Otherwise, increase the Tx-ABT gain
by 2dB.
8. Repeat steps 4 to 8 until P
av
~31dBm
9. Increase the Tx-ABT gain in 0.5dB steps until P
av
=33dBm±0.5dB. Verify, at this position, that
between units variation of BEAMER -Tx reading is less than ±2dB.
10. Record the calibrated Tx-ABT setting and the BEAMER -Tx readings in the BEAMER system
installation record sheet.