Figure 7-19 800/850 Mhz Spectrum; Figure 7-20 Guideline For Unison Rau Antenna Placement - ADC InterReach Fusion Installation, Operation And Reference Manual

FSN-809019-2 RAU
850
Cellular
MHub
FSN-8519-1 RAU
D-620610-0-20 Rev D
these situations is to provide sufficient isolation by physically separating the interfer-
ing transmitters and receivers.
iDEN occupies spectrum at both 800 MHz and 900 MHz (Tx:851–869/Rx:806–824
and Tx:935–941/Rx:896–902), while the Cellular A and B carriers share a single 850
MHz block (Tx:869–894/Rx:824–849). The combination of these frequency bands,
800/900 MHz iDEN and 850 MHz Cellular, result in uplink (BTS receive) bands that
are adjacent to downlink (BTS transmit) bands. Figure 7-19 depicts these nearly con-
tiguous bands, with arrows indicating the interfering downlink and receiving uplink
bands.
800/850 MHz Spectrum
Figure 7-19
850
Installation of an in-building distributed antenna system (DAS) to provide coverage
for both 800/900 MHz iDEN and 850 MHz Cellular must account for these down-
link-to-uplink interference issues and provide adequate isolation.
ADC offers the following guidelines toward achieving the proper amount of isolation
when deploying ADC Fusion DAS products.
Guideline for Unison RAU Antenna Placement
Figure 7-20
850
Cellular
EHub
800 MHz iDEN Downlink and 850 MHz Cellular Uplink
A 2 MHz frequency gap (851 – 849 MHz) separates the 800 iDEN downlink and 850
Cellular uplink frequency bands. Because of this narrow spacing, 800 iDEN down-
link intermodulation products may fall within the 850 Cellular uplink band. In addi-
tion, 800 iDEN downlink signals near the lower edge of the band at 851 MHz may
Help Hot Line (U.S. only): 1-800-530-9960
Fusion Installation Procedures
850
896-902
CONFIDENTIAL
850
Cellular
RAU
7-33