Tower Mounted Amplifiers

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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  
      1800MHz Twin Tower Mounted Amplifier DTMA1718FG12
  DTMA1718FG12 FV  
  • Small, lightweight, twin unit
  • Dual duplexed
  • High Linearity
  • Lightning protected
  • High reliability
  • Full 1800 band




CCI’s Twin TMA contains two TMAs in a single housing.  Each TMA is full band and fully duplexed.  High linearity improves the uplink sensitivity and the receive performance of base stations.
The TMA is powered with DC PDUs, and supports GSM 1800 BTS equipment.  It provides a convenient package for sites using dual polarization antennas.    The twin TMA package reduces tower loading, leasing, and installation costs. An excellent match for two branch receive diversity applications using dual polarization antennas. The input and output connectors are located inline for ease of installation in space constrained areas such as uni-pole structures and stealth antennas.


Technical Description:

The TMA system consists of a twin outdoor tower mount unit with two antenna inputs.  The tower mount unit is dual duplexed to separate the low-power uplink signal from the high-power downlink signal at the antenna port, amplifies the low-level uplink signal using an ultra-low noise amplifier (LNA), and recombines the two paths at the BTS port.  The tower mount units consist of six band-pass filters, four redundant low-noise amplifiers, bypass failure circuitry, and bias tee’s which are all housed in an IP65 moisture proof enclosure, with IP68 Immersion proof connectors suited to long-life masthead mounting.  The unit provides protection against lightning strikes via a multi-stage surge protection circuit.  DC power and control is provided via the feeder cable from the BTS or a Power Distribution Unit (PDU).
An optional indoor power distribution unit (PDU) is available to power up to 3 TMAs and to provide all the monitoring and alarm functions for the system.  The PDU is housed in a single (1U) 1.75” x 19” rack and contains dual redundant power supplies capable of being “hot swapped” that provide a regulated DC supply voltage on the RF coax for the tower mount amplifiers.


RF Parameters Ports Frequency(MHz) Specification
Return Loss ANT 1710-1785 20 dB min. (18 dB bypass mode)
1805-1880 20 dB min.
BTS 1710-1785 20 dB min. (18 dB bypass mode)
1805-1880 20 dB min.
Gain ANT - BTS 1710-1785 12 dB nominal ±0.75 dB 
Insertion Loss ANT - BTS (RX Bypass mode, midband) 1710-1785 1.9 dB typ, 2.8 dB max. @ 25°C, 2.2 dB typ, 3.2 dB max. @ 65°C ± 0.75 dB passband ripple
ANT - BTS (TX) 1805-1880 0.5 dB typ. ±0.2 dB passband ripple
Noise Figure ANT - BTS 1710-1785 1.6 dB typ, 2.0 dB max. @ 25°C, 1.9 dB, 2.4 dB max.  @ 65°C
Input Third Order Intercept Point ANT - BTS 1710-1785 +23 dBm min.
General Characteristics  
Impedance 50 ohms
Continuous Average Power 200 W max.
Peak Envelope Power 2 kW max.
Intermodulation Performance(all ports) <-110 dBm (-153 dBc) typical (2 × +43 dBm tones) all bands
Operating Voltage +10V to +15V DC provided via coax
Operating Current  120 mA


Operating Temperature   -40˚C to +65˚C
Enclosure IP65 (Unit Body), IP68 (Connector)
MTBF >500,000 hours
Lightning Protection 8/20us, ±2KA max, 10 strikes each per IEC61000-4-5


Connectors   4 × 7-16 DIN female
Dimensions (w/o connectors or brackets)(H×W×D) 10.6 × 7.9 × 2.8 in. (270 × 200 × 72 mm)
Dimensions (with brackets)(H×W×D) 14.3 ×8.4 × 3.2 in. (364 × 214 × 82 mm)
Weight 13.7 lbs (6.2 kg)-without bracket
Mounting Pole/Wall mounting bracket
   DTMA1718FG12 Outline
  DTMA1718FG12 Outline Drawing


Block Diagram

   DTMA1718FG12 BD
  DTMA1718FG12 Block Diagram


PDU-1819-3DT Power Distribution and Alarm Unit
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

Product Information


Parts & Accessories

DTMA1718FG12 1800 Full band Fixed Gain Twin TMA


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