User's Manual

G3S-800-180-029 Installation & Service Manual
 Copyright Powerwave Technologies, Inc., April 2002. All rights reserved
044-05112 Rev. A 2-2 April 2002
According to the laws of probability used to formulate Erlang tables, rarely are all channels trans-
mitting at the same time. We can use Erlang tables to predict typical maximum current usage.
Table 2-2 describes the current load for a 3 sector (70%), 2 sector (80%) and omni (90%) site.
Based on this table, an 800 amp power plant may suffice.
Battery backup or UPS systems should be installed in remote sites or in sites which experience
brownout conditions or generator switchovers. Adding this equipment should eliminate the need
for site visits by technicians after brownouts or power outages. Battery backup systems also pro-
vide excellent DC filtering as a side benefit.
Table 2-2 Averaged DC Current Load (Amperes)
(typical, based on % of output power)
Amplifier
Power
No. Of
Amplifiers
3 Sector (70%)
Averaged Current
2 Sector (80%)
Averaged Current
1 Sector (90%)
Averaged Current
100%
Typical
180 9
484 554
180 6
323 334 370
180 3
161 167 176 185
180 1
54 56 59 62
2-3 Air Conditioning
Each G3S-800-180-029 amplifier generates 4852 BTUs of heat at full power. A fully populated
MCR30829-1-3
subrack operating at full power will generate 14,556 BTUs of heat. A full three-
sector site employing three fully populated MCR30829-1-3 subracks will generate 52,510 BTUs of
heat at full power (500W per subrack, 70A, 27VDC). A five-ton air conditioner is needed to cool
this Powerwave equipment. A full three-sector site probably needs at least a five-ton air condi-
tioner to cool all of the site's equipment, based on heat load averaging as described in table 2-2.
In keeping with section 2-3, table 2-3 describes the heat load for a 3 sector (70%), 2 sector (80%)
and omni (90%) site. Perform a site survey to determine actual air conditioning needs.
Table 2-3 Averaged Heat Loading (British Thermal Units/hr)
(typical, based on % of output power)
Amplifier
Power
No. Of
Amplifiers
3 Sector (70%)
Averaged BTU's
2 Sector (80%)
Averaged BTU's
1 Sector (90%)
Averaged BTU's
100%
Typical
180 9
38,973 43,666
180 6
25,982 26,735 29,111
180 3
12,991 13,368 13,961 14,555
180 1
4,330 4,456 4,654 4852
2-4 Unpacking And Inspection
This equipment has been operated, tested and calibrated at the factory. Only in the event of se-
vere shocks or other mistreatment should any substantial readjustment be required. Carefully
open the container(s) and remove the amplifier module(s). Retain all packing material that can be
reassembled in the event that the unit must be returned to the factory.
CAUTION
Exercise care in handling equipment during inspection to prevent damage caused by
rough or careless handling.