Operation Manual

Fiber Distributed Antenna System (Fiber DAS)
41
DHR 800 Series High Power Repeater
The DHR 800 offers a high power solution in a light weight, convection cooled IP65 chassis. The unit offers Bird's
feature rich functions such as self-oscillation protection, fast AGC, link symmetry functionality, SNMP and remote
access via Ethernet or the Bird Remote Gateway all in a rugged IP65 chassis.
Figure 27 DHR 800 Series High Power Repeater
The DHR repeater family offers link symmetry settings. This function is used to automatically adjust the uplink gain
based on the downlink signal. When installed in moving coverage areas such as trains, the feature prevents the
repeater from desensitizing the donor site by automatically controlling uplink levels.
The DHR repeater also offers self-oscillation protection. This function is used to detect problems with isolation
between the donor and service antenna. The repeater will intervene and lower the gain to a level equal to the
isolation minus the stability margin. The settings are separate for UL and DL.
 On/Off
 Stability margin: Value setting of how much lower the gain should be than the calculated isolation. Range
of 0.0 to 20.0dBm.
 Recovery time: Time that should pass before the repeater reset the gain to the value specified level in “RF
Config” (set gain). Range of 30 to 86,400 seconds.
 Recovery margin: Set value of gain level above the gain specified in “RF Config” (set gain) that is used when
the repeater recovers after the “Recovery Time”. Range of 0.0 to 20.0dBm.
Table 57
Gain 50-88 dBm in 1 dB steps
Noise Figure <5 dB
Delay <7 μs
Power Supply 85 to 264 VAC
Power Consumption <130 W
Dimension (WxDxH) 30 x 13 x 70 cm (11.8 x 5.1 x 27.6 inches)
Weight <12 kg (26.4 lbs)
Operating Temp -25 to 55 °C (13 to 131 °F)
Casing IP65
Bandwidth 35 MHz
Connectors N-type or DIN 7/16
DHR800 Specifications