They have a very high input impedance outside of their passband. This makes them useful for splitting Beverage antennas between multiple receivers
post 26 Dec 2021
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High-Pass Filter Design
A high-pass filter’s task is just the opposite of a low-pass filter: to offer easy passage of a high-frequency signal and difficult passage to a low-frequency signal
High Power Lowpass Filter for 145 MHz
to build a low-pass filter for 145 MHz as required after power amplifiers to prevent harmonics to be emitted by the antenna
HF band pass filter
a HF band pass filter which can be used for operating with a running and multiplier stations during contests
Homebrew narrow CW filter
27 pF load capacitors as required in the datasheet and used in the original part simple fully insulated plug-in pins, no soldering required
72
A high-pass filter’s task is just the opposite of a low-pass filter: to offer easy passage of a high-frequency signal and difficult passage to a low-frequency signal
to build a low-pass filter for 145 MHz as required after power amplifiers to prevent harmonics to be emitted by the antenna
a HF band pass filter which can be used for operating with a running and multiplier stations during contests
27 pF load capacitors as required in the datasheet and used in the original part simple fully insulated plug-in pins, no soldering required
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