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Bird - The RF Experts
81-37-25 Series
Isolators and Circulators
81-37-25 Series

81-37-25 Series, 144-174 MHz, Dual-Junction Circulator and Isolators
Bird isolators are designed to provide the specified isolation under continuous duty at maximum power. Their conservative, rugged design and construction have a record of excellent reliability and high performance established through over 20 years of service in critical systems.

Isolators
  • Provides rated isolation at rated continuous power.
  • Standard isolator loads rated to protect against antenna system failure.
Circulators

Circulators are available in dual or single junction configurations from 300 - 530 MHz and 746-960 MHz.

  • Small package outline.
  • Up to 250 watts power handling
  • High isolation throughout bandwidth (no-tuning).
  • Low insertion loss.
  • Low PIM Design.
  • Wide operation temperature range.
  • RoHS compliant.
  • Various connector options available.
  • Custom configuration options available upon request.
Part Number 81-37-25-00 81-37-25-20 81-37-25-50 81-37-25-60 81-37-25-100
RF Load # None 82-01-05 82-01-16 82-01-17 82-01-15
Continous RF Load Power None 5 W 25 W 60 W 100 W
Dimensions, HxWxD
[inches(mm)]
3.94 x 6.25 x 1.78
(100 x 159 x 45)
5.0 x 6.25 x 1.78
(127 x 159 x 45)
8.81 x 6.25 x 1.78
(223 x 159 x 45)
9.91 x 6.39 x 1.78
(252 x 162 x 45)
9.91 x 6.39 x 2.9
(252 x 162 x 74)
Weight, lb. (kg)/td> 2.60 (1.18) 2.78 (1.26) 3.24 (1.47) 3.88 (1.76) 4.60 (2.09)
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Isolators and Circulators
81-37-25 Series
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product specifications:
Item No
81-37-25 Series
Item Name
144-174 MHz, Dual-Junction Circulator and Isolator
Frequency Range
144-174 MHz
Number of Junctions
2
Junction Type
Lumped Constant
Max Continuous Input Power
150 W
Isolation Bandwidth
2.5% of center frequency (dB)
Typical Insertion Loss
0.9 dB
Insertion Loss
1.1 dB
Peak Reverse Isolation
>60 dB
Min Reverse Isolation
>50 dB
Impedance Ω
50
Min Return Loss - VSWR
20 dB (1.22 : 1)
Temperature Range
-30 to +60 °C
Connectors Input-Output-Load
N
compatible devices: