Designed to to be deployed in co-located AWS & 1900 networks, the Kaelus TMA2123 provide gain in the uplink of both bands using a common LNA for reduced size and performance efficiency. Low loss bypass to 698-960MHz low band antennas is also provided.


  • Improved base station sensitivity through excellent noise figure performance and linearity
  • AISG 2.0 compatible, full software upgradable using AISG “personality” upload
  • DC/AISG passthrough to PCS antenna (port 1)
  • AISG OUT connector disabled when AISG device (SBT equipped antenna) present on Port 1 +R1
  • One AISG subunit per LNA, 2 in total. All fixed gain.
  • Internal duplexing of 698-960MHz signals to be passed to additional ANT ports
  • AWS and 1900 diplexed

technical specifications
Band Name 1900 AWS
Passband 1930 - 1990MHz 2110 - 2200MHz
Insertion loss 0.7dB typical 0.4dB typical
Return loss 22dB typical
Maximum input power 160W (average) / 1.6kW (PEP) 160W (average) / 1.6kW (PEP)
Intermodulation products -155dBc maximum, at antenna port in RX band with 2 x 20W carriers -163dBc maximum, at antenna port in RX band with 2 x 20W carriers
Passband 1850 - 1910MHz 1710 - 1780MHz
Gain 13dB
Gain variation ±1dB maximum
Return loss 22dB typical
Bypass return loss 12dB minimum
Bypass loss 2.7dB typical 2.5dB typical
Noise figure 1.4dB typical
Output IP3 +28dBm typical
Maximum input power with no damage 12dBm
700/850 bypass band
Passband 698 - 960MHz
Insertion loss 0.1dB typical
Return loss 21dB typical
Maximum input power 120W (average) / 2kW (PEP)
Intermodulation products -155dBc maximum, at antenna port with 2 x 20W carriers
Impedance 50Ohms
power supply and alarm (current window alarm mode, default)
Current window alarm mode (CWA) is the default operating mode and can be configured to specific customer requirements. The TMA2123F03V4 is configured so that both channels are independently powered and monitored via their respective BTS port, 5 or 6. The BTS port sinks additional current to indicate an alarm state in its uplink path. Normal operating and alarm current values are configured independently via a field-loadable personality file. Please contact Kaelus for more information.
DC supply voltage 7.5 to +18V DC, case is DC ground
DC supply Each BTS port powered individually
DC supply current, normal mode 150mA per port typical
DC supply current, alarm mode 220mA per port typical
aisg mode of operation (auto selected on valid aisg 2.0 frames)
AISG signals can be applied to port 5 or port 6. The TMA unit switches to AISG mode when valid frames are detected on either port 5 or 6. All LNAs take DC power from the port with the AISG frames or, if DC is present on both ports, power will be supplied equally between the ports. Each LNA is controlled uniquely by its sub-unit number.
DC supply voltage +7.5V to +30V DC
AISG version 2.0 (1.1 optional)
Supply current, AISG mode 265mA @ 7.5V, 75mA @ 30V typical
AISG connector, current rating IEC60130-9, 8-pin female, < 4A peak, 2A continuous, pin 6
Field firmware upgradable Yes
AISG pass through to antenna port Yes
antenna aisg ook + dc
When DC is applied to the TMA2123F03V4-1 it is quickly switched through to port 1. If an over-current condition is detected, DC & AISG are disconnected from port 1. If DC remains connected to the load at port 1, DC and AISG are disconnected from the AISG OUT 8 pin connector. If DC is disconnected from port 1, DC and AISG are enabled at the AISG OUT 8 pin connector. If a short circuit is detected at the AISG OUT 8 pin connector, DC and AISG are disabled.
Mode of Operation Voltage at
Port 1
Assumption "Autosense + Protection"
Switch Status
AISG or CWA High Device present or
open circuit
Close DC & AISG OOK will be
supplied to port 1.
DC & AISG is removed
from the AISG OUT 8 pin port
AISG or CWA Low DC short circuit or low
DC resistance
Open DC & AISG OOK will not be
supplied to port 1.
DC & AISG are supplied
to the AISG OUT 8 pin port
For further details of environmental compliance, please contact Kaelus.
Temperature range -40ºC to +65ºC | -40°F to +149°F
Ingress protection IP67
Altitude 2,000m | 6,560ft
Lightning protection IEC61312-1, RF: ±5kA maximum (8/20us), AISG: ±2kA maximum (8/20us)
MTBF >1,000,000 hours
Compliance FCC Part 15 subpart B
Dimensions H x D x W 300 x 95 x 250mm | 11.8 x 3.7 x 9.8in excluding brackets and connectors
Weight 11kg | 24lbs
Finish Painted, light grey (RAL 7035)
Connectors DIN 7-16 (F) x 6 long neck, AISG (F) x 1
Mounting Pole/wall bracket supplied with two metal clamps 45-178mm diameter poles
ordering information
Part Number Configuration Optional Features Connectors
TMA2123F03V4-1A TWIN 2 in / 4 out STANDARD DIN 7-16 (F)
TMA2123F03V4-2A QUAD 4 in / 8 out STANDARD DIN 7-16 (F)
electrical block diagram
mechanical block diagram