Spectrum Control
Spectrum Control (formerly APITech) is a global leader in managing and controlling the electromagnetic spectrum. Spectrum Control makes the invisible electromagnetic spectrum visible and controllable with their industry-leading capabilities.




Components / Coaxial Bias-Tee, DC-Block, Open/Short

High Voltage DC Blocks
DC blocks have a capacitor in-series with the center conductor which prevents the flow of audio and direct current (DC) frequencies.


General Purpose DC Block
DC block have a capacitors which prevent the flow of audio and direct current (DC) frequencies.


75 Ohm Bias Tees
Quality and performance in a standard three-port network specific for 75 Ohm applications


Pulsed Models Bias Tees
Manufactured for maximum performance and minimal disruption.


High Current Bias Tees
Quality and performance in a strandard three-port network for high current applications


General Purpose Bias Tees
Available in SMA, N-Type, and 7/16 DIN connector styles.


Broadband DC Blocks
Outer DC blocks have a capacitor in-series with the outer conductor and the inner/outer types have capacitors in-series.

Components / Coaxial Coaxial Attenuators and Terminations

9000 Series Manual Step Attenuator
Broadband miniature step attenuators providing excellent performance characteristics for high reliability 50 ohm systems.


3000 Series Manual Step Attenuator
High volume fabrication techniques, including injection molding, stamping, broaching and thick film printing ensure a uniform product.


940 Continuously Variable Attenuators
Wide variable attenuation range with approximately linear calibrated dialm and rugged design.


115A – 119A Manual Step Attenuators
A series of broadband, step manual attenuators in a right-angle drive configuration.


Pill Terminations & Attenuators


Powerfilm™ Flange Attenuators
Up to 250 Watts, Up to 4 GHz. Designed tovreduce power of the RF signal while generating only a small reflection even under maximum power conditions.


Powerfilm™ Chip Attenuators
RF Attenuators Up to 250 Watts, Up to 40 GHz


Cryo Attenuator
With low thermal noise characteristics and minimal self-heating, achieving temperature faster.

We sell Spectrum Control products in these categories:
Bias-Tee, DC-Block, Open/Short, Coaxial Attenuators and Terminations,