Bird Technologies 28-83E-01A User Manual
Duplexer 28-83E-01A
for 700 & 800 MHz bands
The new duplexer 28-83E-01A covers both the 700 and 800 MHz bands, providing seamless transition and
unique flexibility to LMR users in either frequency bands.
To transition from operations in one frequency band to the other, only the interconnecting cables need to
replaced, allowing multiple use of the equipment and enabling the user to reconfigure the system in the field.
Like other Vari-Notch® (the trademark for BTG's pseudo bandpass circuit design) filters, this duplexer offers
the best cost-to-performance ratio in its class and is unsurpassed for close-spaced duplexing, combining the
low loss and close frequency spacing advantages of notch filters with the broad isolation and selective pass
characteristics of bandpass filters. The small geometry and efficiency of this circuit design has also resulted
in a variety of space efficient mountings.
Silver Plating Brass tuning probes and
hardened copper contact fingers are silver
plated to avoid erratic tuning, high loss, and
degraded sensitivity
3/16” end cap, not pop rivets
End cap heliarced to the top of the
cavity at the critical current point
eliminates noise generated by poor
metal-to-metal contact
Frequency Range 764 - 869 MHz
Minimum Freq Separation
in 764-806 MHz band 30 MHz
in 806-869 MHz band 45 MHz
Power Rating 125 W
Isolation
Per Channel 90 dB
Between Channel 60 dB
Insertion Loss 0.8 dB
Number of Cavities 4
Cavity Diameter 4"
Connectors N female for all ports
Dimensions HxWxD 5.25" x 19" x +3-6.5
Alodine Coating
Passivates cavity surface,
inside and out.
Hardened Aluminum
Construction
Unlike some copper types, doesn’t
easily dent causing detuning.
Bird® Technologies Group combines the industry leading brands of both Bird Electronic and TX RX Systems and is a global, innovative supplier of RF products, systems, services and
educational solutions. Bird®Technologies Group reserved the right to modify specifications or discontinue any product without notice.
www.bird-technologies.com 440.248.1200/866.695.4569 sales@bird-technologies.com
590-D700-800MHz-DS10112006
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