User's Manual

INSTALLATION GUIDE FOR UHF DAS
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Page 18
2.6 SPECIFICATION OF UHF DAS SYSTEM
EU
Frequency Band
Uplink
MHz
450-512MHz
Downlink
450-512MHz
Optical Wavelength
Uplink
nm
1310
Downlink
1550
Optical Connector Type
SC-APC
Optical Fiber type
Single Mode, WDM (single strand of fiber per Remote Units)
VSWR
≤ 1.5
Number of Remote Units supported per unit
4 or 8
Electrical - System
Frequency Range
MHz
450 - 512
Total Output Power, Uplink (MU Only)
dBm
27 (Typical TX/RX duplexed), 30 (TX/RX separate)
Total Output Power, Downlink (MU and RU)
dBm
33 (Typical TX/RX duplexed), 36 (TX/RX separate)
RF Passbands (RF windows)
Up to 3
*See Note below
Maximum System Gain-Uplink without filters
dB
102
Maximum System Gain-Downlink without filters
dB
105
Gain Adjustment Range (1dB step)
dB
MU: 0-30, RU: 0-30
Pass Band Ripple, p-p
dB
3
Uplink Noise Figure
dB
7
Intermodulation
dBm
 -13
Spurious
dBm
FCC Compliance
Maximum RF Input Level without Damage
dBm
0
Maximum RF Input Level without Overdrive
-10
Input VSWR
 1.5
Impedance

50
*Note:
A set of contiguous downlink/uplink channel pairs count as one passband (one window)
Consult with a Comba technical representative for passband and window configurations before ordering
Digital Filters - Class A
Number of Filters
32
Filter Bandwidth /
Out-of-Band Suppression /
System Group Delay
Bandwidth: 6.25KHz
≥ 60dBc @ filter center + 60KHz, 67us
Bandwidth: 12.5KHz
≥ 60dBc @ filter center + 65KHz, 38us
Bandwidth: 25KHz
≥ 50dBc @ filter center + 75KHz, 29us
Bandwidth: 75KHz
≥ 60dBc @ filter center + 200KHz, 17us
Digital Filters - Class B
Number of Filters
4
Filter Bandwidth
200KHz – 5MHz
System Group Delay
sec
8.5
Out-of-Band Suppression
≥ 45dBc @ filter edge + 0.6MHz
≥ 60dBc @ filter edge + 1MHz