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 Name1900AWS
Passband1930 - 1990MHz2110 - 2200MHz
Insertion loss0.7dB typical0.4dB typical
Return loss22dB typical
Maximum input power160W (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
Passband1850 - 1910MHz1710 - 1780MHz
Gain variation±1dB maximum
Return loss22dB typical
Bypass return loss12dB minimum
Bypass loss2.7dB typical2.5dB typical
Noise figure1.4dB typical
Output IP3+28dBm typical
Maximum input power with no damage12dBm
700/850 bypass band
Passband698 - 960MHz
Insertion loss0.1dB typical
Return loss21dB typical
Maximum input power120W (average) / 2kW (PEP)
Intermodulation products-155dBc maximum, at antenna port with 2 x 20W carriers
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 TMA2123 is configured so that both channels are independently powered and monitored via their respective BTS port. 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 voltage7.5 to +18V DC, case is DC ground
DC supplyEach BTS port powered individually
DC supply current, normal mode150mA per port typical
DC supply current, alarm mode220mA per port typical
aisg mode of operation (auto selected on valid aisg 2.0 frames)
AISG signals can be applied to either BTS port. The TMA unit switches to AISG mode when valid frames are detected on either BTS port. 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 version2.0 (1.1 optional)
Supply current, AISG mode265mA @ 7.5V, 75mA @ 30V typical
AISG connector, current ratingIEC60130-9, 8-pin female, < 4A peak, 2A continuous, pin 6
Field firmware upgradableYes
AISG pass through to antenna portYes
antenna aisg and dc
When DC is applied to the TMA, it is initially switched through to ANT1 port. If a nominal DC current is measured (<2A), DC and AISG are passed through the ANT1 port for antenna AISG control and AISG OUT - 8PIN connector is disabled. If a short circuit is present (>4A) the ANT1 port is disabled and DC and AISG is passed to the AISG OUT port. If a nominal load is measured on the AISG OUT, DC and AISG are passed out the AISG OUT port for antenna AISG control through an external AISG cable. If the AISG OUT port is also a short circuit,the AISG OUT port is also disabled. After AISG routing is determined monitoring of the DC and AISG continues, a short circuit on either enabled port will shut down the affected port, if ANT1 port is shut down DC and AISG will be routed to the AISG OUT port if available.
Mode of OperationExpected load
ANT1 port
Expected load
ANT AISG control via ANT1 port50ohms termination (ie antenna) or open circuit
See Note 1
Any load possible
Short preferred
See Note 2
AISG capable device available via RF portDC and AISG will be supplied to ANT1 port. DC and AISG is disabled from the AISG OUT port
ANT AISG control via AISG OUT portShort circuit50ohms termination (ie antenna RET cable/device) or Open circuitAISG capable device available via external RET cableDC and AISG will not be supplied to ANT 1 port. DC and AISG are supplied to the AISG OUT port
ANT AISG disabledShort circuitShort circuitFault or short circuit present on AISG circuitsAISG disabled for both ANT1 and AISG OUT port. Note TMA continue to operate while DC is applied to BTS ports
Note1: Expected current drawn <2A. If the current rises above 2A but remains below 4A, the current will continue to be monitored for a further 15 seconds. If it remains above 2A after 15 seconds the DC/AISG will be disabled
Note 2: To re-enable the DC/AISG feed on ANT1 and/or AISG port, the TMA will need to be re-started.
For further details of environmental compliance, please contact Kaelus.
Temperature range-40ºC to +65ºC | -40°F to +149°F
Ingress protectionIP67
Altitude2,000m | 6,560ft
Lightning protectionIEC61312-1, RF: ±5kA maximum (8/20us), AISG: ±2kA maximum (8/20us)
MTBF>1,000,000 hours
ComplianceFCC Part 15 subpart B
Feature TWIN
2 IN / 4 OUT
4 IN / 8 OUT
Dimensions H x D x W300 x 97 x 250mm | 11.8 x 3.8 x 9.8in300 x 199 x 250mm | 11.8 x 7.8 x 9.8in
Weight11kg | 24lbs22kg | 48lbs
FinishPainted, light grey (RAL 7035)
ConnectorsDIN 7-16(F), AISG(F)
MountingPoll/wall bracket supplied with two metal clamps 45-178mm diameter poles
ordering information
Part NumberConfigurationOptional FeaturesConnectors
TMA2123F03V4-1A TWIN 2 in / 4 outSTANDARDDIN 7-16 (F)
TMA2123F03V4-2A QUAD 4 in / 8 outSTANDARDDIN 7-16 (F)
electrical block diagram
mechanical block diagram