Bird - The RF Experts
28-37-02A
450-470 MHz, Duplexers
28-37-02A
D-Star Logo 
D-Star Solutions 28-37-02A, 144-174 MHz, Duplexer
  • TX RX Systems offers a wide variety of Duplexer options to suit your application, including Vari-Notch®, Bandpass, and notch type circuits
  • Vari-Notch® design provides low loss and high isolation in a compact package
  • All high RF-current components silver-plated for highest performance
  • Various models to choose from to match your application.

Notes
Specifications for duplexers of unsymmetrical construction or response are listed as follows:

  • Isolation: Noise Suppression/Carrier Suppression
  • Insertion Loss: Tx Loss/Rx Loss

D-STAR is a new ham radio system which offers digital voice and data communication. It connects repeater sites over the Internet and forms a wide area ham radio network. The DSTAR system provides a new capability and functionality to the ham radio world and increases the efficiency of emergency communications.

Where do TXRX systems products come in?
D-star systems are being configured all over the world. Sites may be comprised of VHF, UHF, 1.2 GHz or a complete system including all bands. TXRX offers various products to handle the signal management issues for these repeater site installations.

Duplexers for 28-37-02A (VHF), 28-66-02A (UHF) and 28-97-01A (1.2 GHz) as well as the new 36-97-07053-A, 1.2 GHz Triplexer which allows the use of a single 1.2 GHz antenna for the Tx, Rx, and a high-speed Data channels.

For sites in need of using only a single feedline for VHF/UHF, TX RX Systems manufactures Crossband Coupler models 80-05-06 and 80-05-07 handling up to 250W per band.

450-470 MHz, Duplexers
28-37-02A
Downloads:
product specifications:
Item No
28-37-02A
Item Name
144-174 MHz, Duplexer
Frequency Range
144-174 MHz
Minimum Freq Separation
0.5 MHz
Power Rating
400 W
Isolation
85 dB
Insertion Loss
1.5 dB
Number of Cavities
4
Cavity Size
6.625" Dia.
VSWR
1.3:1
Impedance Ω
50
Dimensions H x W x D
33" x 19" x 15"
Tx-Rx Port Connectors
N
Antenna Connectors
N
Temperature Range
-30 to +60 °C
Shipping Weight
50 lbs.
compatible devices:
28-66-02A
442-450 MHz, Duplexer
28-97-01A
1215-1300 MHz, Duplexer
36-97-07053-A
1.2-1.3 GHz, Triplexer