Low-Pass High Power Filter LPF "High Power 40"

High Power low-pass 9-pole filter is designed to solve difficult interference problems by suppressing out-of-band emission of radio transmitting devices operating in 40M band by adding a tremendous harmonics and hash attenuation, as well as the noise reduction to the electronic equipment (TVs, radios, etc.). It meant to be placed at the output of the amplifier or at the output of the antenna switch.

 

 The filter is a 9-pole passive inductive-capacitive Low Pass Filter constructed in a solid steel, polyester powder coated casing in light gray. For effective heat dissipation active cooling system is provided: the low-noise fan (80x80mm, 12Vdc @0.2 A)  is installed on the one end and protected by a metal grid. The filter design is allows its installation directly on a wall or be placed on a rack, shelf, table, etc.

 

 Connections to the load (antenna) and transmitter are utilizing coaxial connectors SO-239.

 

 Each filter is supplied with the data on insertion loss (S21) and return loss (S11) parameters (measured by Vector Network Analyzer), frequency response graph and VSWR. These plots show the most detailed characteristics of each particular filter.