TMA2151 | MI-115


Designed to be deployed with 1800MHz systems, this Tower Mounted Amplifier enhances cell uplink coverage through improved system noise figure, thereby saving operational and capital expenditure.

Microdata Telecom rebranding to Kaelus!
Microdata Telecom and Kaelus have had combined operations since Oct 2019 when Microdata acquired Kaelus. We strongly believe that by operating under one global brand we will clarify our strengthened position in the telecom market and from January 18th 2021, we are unifying the brands to Kaelus. The MI-115 and the TMA2151 are the same product but to ease the transition for our customers both Kaelus and Microdata part numbers will be maintained.

MI-115: part number under Microdata brand
TMA2151: part number under Kaelus brand


  • Main and diversity channels
  • Excellent noise figure performance
  • AISG2.0 compatible
  • Compact, low weight

technical specifications
Band Name 1800
Passband 1805 - 1880MHz
Insertion loss 0.3dB typical
Return loss 20dB typical, 18dB minimum
Maximum input power 200W (average) / 2kW (PEP)
Intermodulation products -160dBc in RX band at ANT port
Passband 1710 - 1785MHz
Gain 12dB
Return loss 16dB minimum
Bypass return loss 12dB
Bypass loss 2.0dB typical
Noise figure 1.5dB typical
Output IP3 +25dBm minimum
Maximum input power with no damage +12dBm
Impedance 50Ohms
power supply and alarm (current window alarm mode, default)
DC supply voltage 9.0V to 15V DC, case is DC ground via BTS-RF cable
DC supply current, normal mode 80-130 mA per port
DC supply current, alarm mode 170-180 mA per port
aisg mode of operation (auto selected on valid aisg 2.0 frames)
AISG signals can be applied to either BTS1 or BTS2 port. The TMA unit switches to AISG mode when valid frames are detected on one of the BTS ports.
DC supply voltage 9V to 30V DC
AISG version 2.0
Power consumption, AISG mode 2W maximum
For further details of environmental compliance, please contact Kaelus.
Temperature range -40ºC to +65ºC | -40°F to +155°F
Ingress protection IP67
Lightning protection IEC61312-1, RF: ±5kA maximum (8/20us), AISG: ±2.5kA common mode (8/20us)
MTBF >1,000,000 hours
Compliance EMC: EN 301 489-50
Safety: EN 62368-1
Operation: ETSI EN 300 019 class 4.1E
Storage: ETS 300 019-1-1 class 1.3E
Transport: ETS 300 019-1-2 class 2.3
Dimensions H x D x W 168 x 275 x 58mm | 6.61 x 10.83 x 2.28in (excluding brackets and connectors)
Weight 4.0kg | 8.82lbs
Finish Powder coated, NCS 1502-R
Connectors DIN 7-16 (F) long neck or 4.3-10 (F) long neck (see ordering information)
Mounting Pole/wall bracket using two metal clamps, suits 40-140mm diameter poles
shipping information
Carton size 380 x 250 x 150mm
Gross weight (including packaging) 5.5kg
Carton Qty / Pallet 54
ordering information
Part Number Configuration Optional Features Connectors DC/AISG Configuration
TMA2151F01V1-1 TWIN, 2 in / 2 out BASE MODEL - KAELUS BRAND 4.3-10 (F) Refer to AISG MODE OF OPERATION section
TMA2151F01V2-1 TWIN, 2 in / 2 out BASE MODEL - KAELUS BRAND 7-16 (F) Refer to AISG MODE OF OPERATION section
MI-11532 TWIN, 2 in / 2 out BASE MODEL - MICRODATA BRAND 4.3-10 (F) Refer to AISG MODE OF OPERATION section
MI-11512 TWIN, 2 in / 2 out BASE MODEL - MICRODATA BRAND 7-16 (F) Refer to AISG MODE OF OPERATION section
electrical block diagram
mechanical block diagram