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 (RET port) connector disabled when AISG device (SBT equipped antenna) present on Port 3 +R1/+R1
  • One AISG subunit per LNA, 4 in total. All fixed gain.

technical specifications
Band Name700H band850 band
Passband746.5 - 755.5MHz869 - 894MHz
Bandwidth10MHz LTE signal centred on 751MHzNA
Insertion loss0.3dB typical0.4dB typical
Return loss24dB typical
Group delay variationIn 5MHz = 10ns typicalIn 5MHz = 10ns typical
Maximum input power60W (average) / 600W (PEP)150W (average) / 1.5kW (PEP)
Intermodulation products-155dBc maximum, at antenna port with 2 x 20W carriers (in RX band)
Passband777.5 - 786.5MHz824 - 849MHz
Bandwidth10MHz LTE signal centred on 782 MHzN/A
Gain variation±1dB maximum±1dB maximum in any 10MHz
±1.2dB maximum in 25MHz
Return loss22dB typical @ 15dB gain
Bypass return loss12dB typical
Bypass loss3.0dB typical
Noise figure1.6dB typical1.3dB typical
Output IP3+30dBm typical
Maximum input power with no damage+12dBm maximum
Group delay variation300ns maximumIn 5MHz = 300ns maximum
RejectionRx in filter rejection 763 - 775MHz = 40dB minimumRx in filter rejection 851 - 856MHz = 30dB minimum
700l band - non intrusive pim testing
Passband698 - 746MHz
Insertion loss0.5dB maximum
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 TMA2125F03V4 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 supplyEach BTS port powered individually
DC supply current, normal mode200mA per port typical
DC supply current, alarm mode300mA 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 version2.0 (1.1 optional)
Supply current, AISG mode500mA @ 7.5V, 135mA @ 30V typical
AISG connector, current ratingIEC60130-9, 8-pin female, < 4A peak, 2A continuous, pin 6
Field firmware upgradableYes (R951022VZA2.0 Rev 2.9.11)
AISG pass through to antenna portYes
antenna aisg ook + dc
When DC is applied to the TMA2125F03V4-1 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 OperationVoltage at
Port 3
Assumption"Autosense + Protection"
Switch Status
AISG or CWA HighDevice present or
open circuit
CloseDC & AISG OOK will be
supplied to port 3.
DC & AISG is removed
from the AISG OUT 8 pin port
AISG or CWA LowDC short circuit or low
DC resistance
OpenDC & 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 protectionIP67
Altitude3,000m | 10,000ft
Lightning protectionIEC61312-1, RF: ±5kA maximum (8/20us), AISG: ±2kA maximum (8/20us)
MTBF>1,000,000 hours
ComplianceFCC Part 15 subpart B
Dimensions H x D x W260 x 195 x 160 mm | 10.2 x 7.7 x 6.3 in
Weight9.1 kg | 20 lbs
FinishPainted, light grey (RAL 7035)
ConnectorsDIN 7-16 (F) x 4 long shank, AISG (F) x 1
MountingPoll/wall bracket supplied with two metal clamps 45-178mm diameter poles
ordering information
Part NumberDescription
TMA2125F03V4-2ATWIN TMA, x2, 700H/850, ANTENNA AISG
electrical block diagram
mechanical block diagram