Designed to be used at co-located 850MHz and 900MHz sites, the Kaelus TMA2050 provides rejection of the 850MHz downlink frequencies while amplifying the 900MHz thereby removing the need for external 900MHz filtering.


  • Part band GSM900 with rejection below 890MHz, ideal for co-located 900 and 850MHz networks
  • Twin 900MHz TMA unit with high linearity and low noise figure performance
  • Hardware and software configuration using AISG personality upload
  • High reliability with lightning protection and bypass mode

technical specifications
downlink (tx) path
Passband 943 - 960MHz
Bandwidth Up to 17MHz tuned anywhere within 935 - 960MHz
Return loss 18dB minimum
Insertion loss 0.35dB typical
EVM 2% typical / 5% maximum in any 4MHz
Group delay variation 5ns maximum per 200kHz, 20ns maximum per 4MHz
Maximum input power with no damage 200W (average) / 2kW (PEP)
uplink (rx) path
Passband 898 - 915 MHz
Bandwidth 17MHz tuned anywhere within 890 - 915MHz
Nominal gain 13 ± 1dB
Gain variation over frequency, temperature ±0.45dB maximum
Noise figure 1.1dB typical
Return loss 18dB minimum, 12dB minimum bypass mode
Insertion loss 2.5dB typical bypass mode
EVM in any 4MHz
2% typical / 5% maximum (902 - 915MHz)
6% typical / 10% maximum (898 - 902MHz)
Group delay variation 20ns maximum per 200kHz, 100ns maximum per 4MHz
Output IP3 +10dBm minimum (3rd order)
Maximum input power with no damage <12dBm
ANT to BTS, vs 902.5MHz, F00V1
50 - 890MHz 50dBc minimum
922.5 - 932.5MHz 30dBc minimum
1000 - 2200MHz 30dBc minimum
Impedance 50ohms
Intermodulation products -153dBc maximum at antenna ports, BTS port with 2 x 43dBm TX carriers
power supply and alarm (current window alarm mode, default)
Current window alarm mode (CWA) is the default TMA operating mode and can be configured to specific customer requirements using a personality file. The TMA2050F00V1 is configured so that both channels are powered and monitored via the BTS1 port. The BTS1 port consumes different current to indicate an alarm state in either uplink path. Normal operating and alarm current values are configured independently and are alterable via a field-loadable personality file. Please contact Kaelus for more information.
DC supply voltage +8.5V to +30V DC
DC supply voltage via BTS-RF cable BTS1 (F00V1: BTS2 does not support DC)
DC supply current, normal mode 250mA typical
DC supply current, alarm mode 135mA (LNA1), 195mA (LNA2) (typical)
aisg mode of operation (auto selected on valid aisg 2.0 frames)
AISG signals must be applied to BTS1 port. The TMA switches to AISG mode when valid frames are detected on BTS 1 port. If DC is present on BTS2 port then no current is drawn on BTS2 port.
AISG version 2.0 (1.1 optional)
Supply current, AISG mode 55mA at 30V, 120mA at 12V typical
Voltage drop, BTS to AISG port 1.1 V maximum
AISG connector, current rating IEC60130-9, 8-pin female, < 4A peak, 2A continuous, pin 6
Field firmware upgradable Yes by AISG download
For further details of environmental compliance, please contact Kaelus.
Temperature range -40º to +65ºC | -40º to +149ºF
Ingress protection IP67
Altitude 2,600m | 8,530ft maximum
Lightning protection IEC61312-1, RF: ±5kA maximum (8/20us), AISG: ±2kA maximum (8/20us)
MTBF >1,000,000 (hours)
Compliance EMC:EN301 489
Dimensions H x D x W 331 x 300 x 86mm | 13 x 11.8 x 3.38in (excluding brackets and connectors)
Weight 10.5kg | 23.1lbs
Finish Painted, light grey (RAL7035)
Connectors DIN 7-16 (F) x 4 long neck
Mounting Pole/wall bracket supplied with two metal clamps 45-178mm diameter poles
ordering information
Part Number Configuration Optional Features Connectors
Contact Kaelus for options.
TMA2050F00V1-1 TWIN 2 in / 2 out DC on BTS1 only DIN 7-16 (F)
electrical block diagram
mechanical block diagram