81-70-26 Series

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81-70-26 Series


81-70-26 Series, 450-470 MHz, Dual-Junction Circulator and 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.


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


  • Available dual or single junction versions from 118-250 MHz, 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
  • Ideal for applications with minimal guard band between transmit and receive frequencies

xx = load: 50 = 25 watts, 60 = 60 watts, 100 = 100 watts
** load dependent


Product Specifications 
Item No81-70-26 Series
Item Name450-470 MHz, Dual-Junction Circulator and Isolator
Isolation Bandwidth450-470 MHz
Number of Junctions2
Isolation50 dB
Insertion Loss0.44 dB
Return Loss21 dB
PWR - FWD-RFL250/**
Temperature Range-30 to +60 °C
Connector TypePorts 1-3: N (F), Port 4: 10W
Dimensions H x W x L0.87" x 4.17" x 2.28"
(22.0 x 106.0 x 58.0 mm)
Tolerance±0.1 mm, ±0.01 inch