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Product Catalogue
Two-TETRA-Station combiner
  • The two-TETRA-Station combiner consists of a highly selective helical duplex filter for each input. This helical filter will split the transmitter (TX) signal and the receiver (RX) signal in two and send the TX-channel to an isolator and the RX-channel to the passive RX-splitter.
  • From the isolator the TX-signal is fed through a low-pass filter into a hybrid. From the hybrid the signal is fed to another helical duplex filter similar to the input duplex filter and is now connected to the antenna.
  • The RX-signal runs from the antenna through the output duplex filter to a hybrid splitter where it is divided into two (two extra splitters are required for the four-channel version) and sent to the two/four input duplex filters.
  • Figure 1 shows a simple block diagram, describing the functionality.
ELECTRICAL
MODEL PRO-MIX-PHY-TETRA-2-N
TYPE TETRA combiner
TX/RX FREQUENCY TX: 380 – 385 MHz
RX: 390 – 395 MHz
INSERTION LOSS
TX-ANT.
Typical -8.5 →-9.5 dB
INSERTION LOSS
RX-ANT.
Typical -8.0 →-9.0 dB
Isolation TETRA 1→TETRA 2 TX - TX: Typical > 60 dB (380 – 385 MHz)
RX - RX: Typical > 20 dB (390 – 395 MHz)
MAX. POWER 25 W/station
GROUP DELAY VARIATION TX-ANT. < 120 nsec.
RX-ANT. < 150 nsec.
DATA FOR DUPLEX FILTER  
INSERTION LOSS 380 – 385 MHz: Typical 1.4 → 1.6 dB
390 – 395 MHz: Typical 1.2 → 1.7 dB
TX NOISE SUPRESSION
ON RX-FREQUENCY
> 60 dB
RX ISOLATION
ON TX-FREQUENCY
> 60 dB
SWR ON TX AND RX Typical < 1.3
DATA FOR ISOLATOR  
INSERTION LOSS 380 – 385 MHz: < 0.5 dB
ISOLATION OUTPUT TO INPUT Typical > 40 dB
SWR ON INPUT < 1.2
DATA FOR HYBRID  
INSERTION LOSS 390 – 395: MHz: < 3.5 dB
ISOLATION 380 – 395 MHz: > 30 dB
MECHANICAL
CONNECTOR TYPE N-female
COLOUR Black
DIMENSIONS (L x W x H) 240 (excl. conn.) x 190 x 65 mm
WEIGHT Approx. 3200 g
IP-GRADE IP-62
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© TABBARA GENERAL. Ltd. 2011. Designed & Developed by Quakevision sarl.