TWIN TMA 700H/850


Designed to be deployed in co-located 700 and 850MHz networks the Kaelus TMA2125 provides gain in the 700H uplink and in the 850MHz uplink, using independent LNAs per band and per channel.


  • Improved base station sensitivity through excellent noise figure performance and linearity
  • AISG 2.0 compatible, full software upgradable using AISG “personality” upload
  • Suitable for CDMA and LTE signals
  • Rejection of the North American public safety band rejection allows co-location
  • AISG OOK + DC output to the antenna port of channel 1
  • AISG OUT connector disabled when AISG device (SBT equipped antenna) present on Port 3 +R1/+R1
  • Fixed or Variable Gain options available.
  • Standard Mount or Low wind load, cell facing options available

technical specifications
Band Name 700H band 850 band
Passband 746.5 - 755.5MHz 869 - 894MHz
Bandwidth 10MHz LTE signal centred on 751MHz NA
Insertion loss 0.3dB typical 0.4dB typical
Return loss 24dB typical
Maximum input power 60W (average) / 600W (PEP) 150W (average) / 1.5kW (PEP)
Intermodulation products -155dBc maximum, at antenna port with 2 x 20W carriers (in RX band)
Passband 777.5 - 786.5MHz 824 - 849MHz
Bandwidth 10MHz LTE signal centred on 782 MHz N/A
Gain 15dB 15dB
Variable gain 5dB to 15dB in 1dB steps (Variable Gain Models only)
Gain variation ±1dB maximum ±1dB maximum in any 10MHz
±1.2dB maximum in 25MHz
Return loss 22dB typical @ 15dB gain
Bypass return loss 12dB typical
Bypass loss 3.0dB typical
Noise figure 1.6dB typical 1.3dB typical
Output IP3 +30dBm typical
Maximum input power with no damage +12dBm maximum
Rejection Rx in filter rejection 763 - 775MHz = 40dB minimum Rx in filter rejection 851 - 856MHz = 30dB minimum
700l band - non intrusive pim testing
Passband 698 - 746MHz
Insertion loss 0.5dB maximum
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 TMA is configured so that both channels are independently powered and monitored via their respective BTS port, 1 or 2. 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 +8.5 to +18V DC, case is DC ground
DC supply Each BTS port powered individually
DC supply current, normal mode 200mA per port typical
DC supply current, alarm mode 300mA per port typical
aisg mode of operation (auto selected on valid aisg 2.0 frames)
AISG signals can be applied to port 1 or port 2. The TMA unit switches to AISG mode when valid frames are detected on either port 1 or 2. 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 500mA @ 7.5V, 135mA @ 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 TMA it is quickly switched through to port 3. If an over-current condition is detected, DC & AISG are disconnected from port 3. If DC remains connected to the load at port 3, DC and AISG are disconnected from the AISG OUT 8 pin connector. If DC is disconnected from port 3, 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 3
Assumption "Autosense + Protection"
Switch Status
AISG or CWA High Device present or
open circuit
Close DC & AISG OOK will be
supplied to port 3.
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 3.
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 3,000m | 10,000ft
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
Feature TWIN
2 IN / 2 OUT
4 IN / 4 OUT
Dimensions H x D x W 260 x 160 x 195mm | 10.2 x 6.3 x 7.7 in 260 x 325 x 195mm | 10.2 x 12.8 x 7.7 in
Weight 9.1kg | 20lbs 18.2kg | 40lbs
Finish Painted, light grey (RAL 7035)
Connectors DIN 7-16(F), AISG(F)
Mounting Poll/wall bracket supplied with two metal clamps 45-178mm diameter poles
ordering information
standard mount
Part Number Configuration Optional Features Connectors
TMA2125F02V4-1A TWIN 2 in / 2 out Variable Gain
Firmware Variant A
DIN 7-16 (F)
TMA2125F02V4-2A QUAD 4 in / 4 out Variable Gain
Firmware Variant A
DIN 7-16 (F)
TMA2125F02V4-1D TWIN 2 in / 2 out Variable Gain
Firmware Variant D
DIN 7-16 (F)
TMA2125F02V4-2D QUAD 4 in / 4 out Variable Gain
Firmware Variant D
DIN 7-16 (F)
electrical block diagram
mechanical block diagram