TWIN TMA 850/900

Designed to be used at co-located 850MHz and 900MHz sites, the Kaelus TMA2048 provides internal diplexing and gain in the both the 850 and 900MHz two bands.


  • Improved base station sensitivity through gain in both the 850 & 900 uplink bands
  • Excellent noise figure performance.
  • Fail safe bypass mode and full lightning protection.
  • AISG 2.0 compatible, fully software upgradable.
  • Minimizes feeder runs reducing Capital and operational expenditure through internal diplexing

technical specifications
Band Name850900
Passband870 - 880MHz951.8 - 960MHz
Insertion loss0.5dB typical, 0.7dB maximum
Return loss18dB minimum
EVM2 % maximum in any 4MHz
Maximum input power100W (average) / 1kW (PEP)100W (average) / 1kW (PEP)
Intermodulation products-155dBc (7th order) with 2 x 20 W carriers-155dBc (11th order) with 2 x 20 W carriers
Passband825 - 835MHz906.8 - 915MHz
Gain15dB ± 1dB
Return loss18dB minimum operating, 15dB in bypass
Bypass loss3.0dB maximum over temperature range
2.0dB typical mid band at 25 ºC
3.0dB maximum over temperature range
2.2dB typical mid band
Noise figure1.8 dB maximum over temperature range, 1.0dB typical mid band at 25ºC
Rejection83dBc minimum (RXin filter only)83dBc minimum (RXin filter only)
Rejection< 810MHz = 70dBc minimum (RXin filter only)
EVM5 % maximum in any 4MHz
Input Intercept Point+8dBm typical
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 TMA2048 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 supplyThrough BTS MAIN port. Shield is negative earth.
DC supply current, normal mode250 ± 40 mA (four LNAs all OK)
DC supply current, alarm mode350 ± 40 mA (a failure in any LNA)
power consumption
Normal operation2.1W @ 8.5V, 4.5W @ 18V typical
Alarm mode5.25W @ 15V 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. Both 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.
DC supply voltage8.5V to +30V DC
AISG version2.0 (1.1 optional)
Supply current, AISG mode270mA @ 8.5V, 90mA @ 30V typical
Voltage drop, BTS to AISG port 1.5V maximum at 2A
Power consumption, AISG mode2.3W @ 8.5V, 2.7W @ 30V typical
AISG connector, current ratingIEC60130-9, 8-pin female, < 4A peak, 2A continuous, pin 6
For further details of environmental compliance, please contact Kaelus.
Temperature range-40ºC to +65ºC | -40°F to +149°F
Ingress protectionIP67
Lightning protection5kA (8/20us) RF ports, 2kA (8/20us) AISG port
MTBF>700,000 hours
ComplianceETSI EN 300 019 class 4.1, EN301 489
Dimensions H x D x W300 x 250 x 162mm | 11.8 x 9.8 x 6.4in
Weight15kg | 33lbs maximum
FinishPainted, light grey (RAL 7035)
ConnectorsDIN 7-16 (F) x 4 long neck
MountingPoll/wall bracket supplied with two metal clamps 45-178mm diameter poles
ordering information
Part NumberDescription
xx denotes customized CWA configuration
TMA2048FxxV1-1Twin TMA, 850/900MHz, dual band with AISG
electrical block diagram
mechanical block diagram