TMA2146 | MI-137


Designed to be deployed with 800MHz systems, this Tower Mounted Amplifier provides gain in the 800MHz band and improves 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-137 and the TMA2146 are the same product but to ease the transition for our customers both Kaelus and Microdata part numbers will be maintained.

MI-137: part number under Microdata brand
TMA2146: part number under Kaelus brand


  • Improved base station sensitivity through gain in the 800MHz band
  • Fail safe bypass mode with lightning protection
  • High linearity and low noise performance
  • Small light weight and easy to install

technical specifications
Band 800
Passband 791 - 821MHz
Insertion loss 0.5dB typical
Return loss 20dB typical, 18dB minimum
Maximum input power 200W
Intermodulation products -160dBc maximum with 2 x 43dBm carriers in RX band at ANT
Passband 832 - 862MHz
Gain 12dB nominal
Return loss 16dB minimum
Bypass return loss 12dB minimum
Bypass loss 1.7dB typical
Noise figure 1.3dB typical
Output IP3 +25dBm typical
Maximum input power with no damage +12dBm
Impedance 50Ohms
aisg mode of operation (auto selected on valid aisg 2.0 frames)
AISG signals can be applied to the BTS ports. The TMA unit switches to AISG mode when valid frames are detected on either port. Each LNA is controlled uniquely by its sub-unit number.
DC supply voltage +9.0V to +30V DC
AISG version 2.0
Power consumption, AISG mode <2W
AISG connector, current rating IEC60130-9, 8-pin female
For further details of environmental compliance, please contact Kaelus.
Temperature range -40ºC to +65ºC | +40°F to +149°F
Ingress protection IP67
Lightning protection RF: ±5kA maximum (8/20us), AISG: ±2kA maximum (8/20us)
MTBF >1,400,000 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 230 x 245 x 68 mm | 9.05 x 9.65 x 2.68 in
Weight 5.7 kg | 12.57 lbs
Finish Powder coated, NCS 1502-R
Connectors DIN 7-16 (F) long neck or 4.3-10 (F) long neck (see ordering information)
Mounting Poll/wall bracket supplied with two metal clamps 40-140mm diameter poles
shipping information
Carton size 380 x 300 x 160 mm
Gross weight (including packaging) 5.0kg
Carton Qty / Pallet 48
ordering information
Part Number Configuration Optional Features Connectors AISG Mode
TMA2146F01V1-1 TWIN, 2 in / 2 out BASE MODEL - KAELUS BRAND 4.3-10 (F) Refer to AISG MODE OF OPERATION section
TMA2146F01V2-1 TWIN, 2 in / 2 out BASE MODEL - KAELUS BRAND 7-16 (F) Refer to AISG MODE OF OPERATION section
MI-13731 TWIN, 2 in / 2 out BASE MODEL - MICRODATA BRAND 4.3-10 (F) Refer to AISG MODE OF OPERATION section
MI-13701 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