The Kaelus DBC0108 is a bi-directional Diplexer designed to combine 600 & 700 with 850 technologies, the DBC0108 provides excellent insertion loss and passive intermodulation performance. Bidirectional passage of DC/AISG is provided in this outdoor product.


  • Enables antenna/feeder sharing for 600-700 and 850 networks
  • Designed and 100% tested for low passive intermodulation
  • Autosense of DC allows operation at the bottom or the top of the tower
  • Very low insertion losses
  • High Return Loss

technical specifications
Port Name 600-700 850
Passband 555 - 798MHz 824 - 894MHz
Insertion loss 0.15dB typical, 0.35dB maximum 0.15dB typical, 0.3dB maximum
Return loss 23dB typical, 20dB minimum
EVM ≤0.5% across any 10MHz ≤0.5% across any 20MHz
Group delay variation 7.5ns typical, 20ns maximum
over any 10MHz
10ns typical, 20ns maximum
over any 20MHz
Absolute group delay 7.5ns typical, 30ns maximum 17.5ns typical, 30ns maximum
Maximum input power 120W (average) / 1200W (PEP) 120W (average) / 1200W (PEP)
Phase linearity over any 10MHz 2° typical, 10 °maximum
Impedance 50Ohms
Intermodulation products -156dBc maximum / -160dBc typical all ports with 2 x 20W carriers
Isolation 50dB typical
dc / aisg
The DC/AISG path is automatically selected. In bottom of the tower applications (combiner mode), each RF channel port is sequentially checked for the presence of DC voltage. If more than one port has voltage, the port that has the highest (programmed) priority is passed to the common port. If a short circuit is detected on the common port DC/AISG is disabled. In top-of-tower applications (splitter mode), DC/AISG is passed to all ports that do not present a short circuit. If a short circuit is detected, the shorted RF port will be disabled for DC/AISG while other RF ports remain connected. To reduce current consumption at low supply voltage, LEDs are sequentially enabled.
Passband 2.076 - 2.276MHz
Input voltage range 7.5 - 30V DC
DC current rating 2.5A continuous
Compliance 3GPP, TS 25.461
Current consumption 20mA typical, 25mA maximum
Port priority (combiner mode) 1st) 600-700, 2nd) 850
LEDs 1 bi-colour LED per RF port connector
LEDs, bottom of tower application:  
- DC/AISG not present Off
- DC/AISG pass Green
- DC/AISG present, not passed Red
LEDs, top of tower application:  
- DC/AISG disabled Off
- DC/AISG pass Green
- All ports disabled R1/R1 LED red
For further details of environmental compliance, please contact Kaelus.
Temperature range -40ºC to +65ºC | -40ºF to +149ºF
Ingress protection IP67
Altitude 3000m/10,000ft maximum
Lightning protection RF: ±5kA maximum (8/20us), IEC61312-1
MTBF >1,000,000 hours
Compliance FCC part 15 subpart B
Dimensions H x D x W 172 x 145 x 89 mm | 6.8 x 5.7 x 3.52 in
Weight 2.9kg / 6.4lbs
Finish Painted, light grey (RAL7035)
Wind Load Front 198N, Side 75N (single)
At 74m/s (AS/NZS 1170-2-2011 Structural design - Wind actions - Cyclone areas)
Connectors 4.3-10 (F) x 3 long neck
Mounting Pole/wall bracket supplied with two metal clamps for 45-178 mm diameter poles
ordering information
Part Number Description
DBC0108F1V72-1 DIPLEXER 600-700/850 DC AUTO 600-700 WITH LED
DBCT108F1V72-1 DIPLEXER TWIN 600-700/850 DC AUTO 600-700 WITH LED
DBCT108F1V72-2 DIPLEXER TWIN X2 600-700/850 DC AUTO 600-700 WITH LED
electrical block diagram
mechanical block diagram