Same Band Combiners

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+1 (201) 342-3338 phone  
+1 (201)-342-3339 fax  
89 Leuning Street  
South Hackensack, NJ 07606  
Customer Service  
+1 (201) 342-3338 phone  
+1 (201)-342-3339 fax  
89 Leuning Street  
South Hackensack, NJ 07606  
Technical Support  
+1 (201) 342-3338 phone  
+1 (201)-342-3339 fax  
89 Leuning Street  
South Hackensack, NJ 07606  
      Outdoor Low Loss Diplexer LLC-1721-FTU-0-A1-EX
  LLC1721FTU0A1A2 FV  
  • Low Loss Combining
  • Full Transmit and Receive Combining
  • Typ. 0.7 dB Insertion Loss
  • AISG 2.0 compliant
  • High Reliability Design
  • High Power Handling
  • Excellent Filter Response
  • Temperature Stable
  • Fully Passive
  • Low Intermodulation
  • Optional Wall Mount Kit Available




CCI’s AWS In-Band Low Loss Diplexer with a “0” MHz Guard Band  combines two UMTS or LTE AWS Base Station sub-band outputs band onto a single feeder without the insertion loss normally associated with hybrid combiners.  The unit is fully passive and delivers a matched low insertion loss solution for the sharing of common feeder lines and antennas. The unit is completely passive and provides automatic routing of DC and AISG signals from the individual input ports to the common port.  The unit is housed in a weatherproof outdoor enclosure suitable for tower mount application.


Technical Description:

This In-Band Diplexer allows the TX/RX combining of AWS A1 Band with AWS A2 thru J Bands separated by a “0” MHz Guard Band.  Internal duplexers deliver signal to independent Tx and Rx filter combiners, enabling a high level of control and performance to maintain good isolation while minimizing insertion loss. Stages are kept to a minimum to maximize power and efficiency.  Transmit paths are fully isolated from Receive paths to prevent intermodulation products.  The fully weatherproof tower mount unit incorporates a unique intelligent Bias-T architecture which passes the DC and AISG carrier frequency from any of the input ports to the common port while blocking the DC and AISG signals from being re-injected into the other input ports.  The tower mount unit consists of multiple band-pass filters which are all housed in an IP68 immersion proof enclosure, with IP68 immersion proof connectors suited for long-life masthead mounting.  The unit provides protection against lightning strikes via a multi-stage surge protection circuit.

  BD LLC1721FTU0A1 V1.0 161111Simple


RF Parameters Ports Frequency(MHz) Specification
Return Loss Common and Bandstop 1705 - 1780 18 dB min., 20 dB Typ.
2105 - 2180 18 dB min., 20 dB Typ.
Bandpass 1705 - 1780 18 dB min., 20 dB Typ.
2105 - 2180 18 dB min., 20 dB Typ.
Insertion Loss Common to Bandpass 1705 - 1715 0.7 dB typ.
2105 - 2115 0.7 dB typ.
Common to Bandstop 1715 - 1780 0.7 dB typ.
2115 - 2180 0.7 dB typ.
Isolation Bandstop to Bandpass 1705.56 - 1714.44 ≥30 dB typ. 
1715 - 1780 ≥30 dB typ.
2105.56 - 2114.44 ≥30 dB typ.
2115 - 2180 ≥30 dB typ.


General Characteristics  
Impedance 50 ohms
Guard Band No additional guard band  required beyond the built in guard band for UMTS and/or LTE (10 MHz or greater)
EVM < 4% over each 3.84 MHz UMTS channel
Group Delay 100 nS - 190 nS over each 3.84 MHz UMTS channel
Continuous Average Power 200 W max. (all ports)
Peak Envelope Power 2 kW max. (all ports)
Intermodulation Performance(all ports) <-110 dBm (-153 dBc) typical (2 × +43 dBm tones) all bands
DC Pass-Through Self detecting*
AISG Pass-Through Follows detected DC*
  *If DC is detected for ANT-Tx1/Rx1, then AISG is passed-through as well, and DC is blocked for ANT-Tx2/Rx2 path, and vice versa


  PA LLC1721FTU0A1 V1.5 161111ap1
  PA LLC1721FTU0A1 V1.5 161111ap2
  "0 MHz" Guard Band Low Loss Diplexer Typical Applications for UMTS & LTE


Operating Temperature   -40˚C to +65˚C
Relative Humidity 5% to 100%
Enclosure IP68 (Unit Body), IP68 (Connector)
MTBF >500,000 hours
Lightning Protection 8/20us, ±20KA max, 10 strikes, per IEC61000-4-5


Connectors   3 × 7-16 DIN female
Dimensions (body only)(H×W×D) 10.43 × 10.43 × 5.12 in. (265 × 265 × 130 mm)
Dimensions (incl. bracket and conn.)(H×W×D) 10.43 × 12.91 × 11.9 in. (265 × 328 × 302 mm)
Weight 41 lbs (18.6 kg)
Mounting Pole/Wall mounting bracket


  LLC1721FTU0A1A2 Outline
  AWS In-Band Low Loss Diplexer Outline Drawing

Block Diagram

  BD LLC1721FTU0A1 V1.1 161111Detailed
  Outdoor Diplexer Block Diagram


SCU-AISG2-3 AISG 2.0 Site Controller
BT-0821-DMDF-AG-O DIN-Male RF Port, DIN-Female RF+DC+AISG Port
BT-0821-DFDM-AG-O DIN-Female RF Port, DIN-Male RF+DC+AISG Port
BT-0821-DFDF-AG-O DIN-Female RF Port, DIN-Female RF+DC+AISG Port

Parts & Accessories

LLC-1721-FTU-0-A1-EX AWS In-Band Low Loss Diplexer with "0" MHz Guard Band with bracket
  (Consult factory for alternate bandpass frequencies)


Antenna Interface Standards Group (AISG), Federal Communication Commission (FCC) Part 15 Class B, CE, CSA US


89 Leuning Street

South Hackensack, NJ 07606

+1 (201) 342-3338

+1 (201) 342-3339 fax