Sometimes many VHF-UHF modern tranceivers have problems with Broadcast Interference and Cross modulation from FM commercial broadcast stations
post 26 Dec 2021
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5th order High Pass VHF Filter
Sometimes many VHF-UHF modern tranceivers have problems with Broadcast Interference and Cross modulation from FM commercial broadcast stations
5 bands remote switchable BPF
These band filters are based on 3 or 5 sections Butterworth band pass filters, maintaining 50 Ohm impedance
50 MHZ low pass filter
This very heavy duty 50 MHz Low Pass Filter was constructed by using a pair of 50 pF, 15 kVDC ceramic doorknob capacitors, and three air wound self supporting coils
How to make a coax notch or bandpass filter
a sharp notch filter for an unwanted frequency band
Simple band pass filter for 23cm
a 3-pole and a 5-pole, which one you use depends on how selective you want the filter to be, and the insertion loss to be tolerated
72
Sometimes many VHF-UHF modern tranceivers have problems with Broadcast Interference and Cross modulation from FM commercial broadcast stations
These band filters are based on 3 or 5 sections Butterworth band pass filters, maintaining 50 Ohm impedance
This very heavy duty 50 MHz Low Pass Filter was constructed by using a pair of 50 pF, 15 kVDC ceramic doorknob capacitors, and three air wound self supporting coils
a sharp notch filter for an unwanted frequency band
a 3-pole and a 5-pole, which one you use depends on how selective you want the filter to be, and the insertion loss to be tolerated
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