High Q notch filter with BNC connector. It allows the reduction of broadcasting frequencies from 88 to 108MHz. This version designed to be combined only with receivers, scanners or sdr allows low-loss reception also of frequencies adjacent to the FM band such as the civil band at 78MHz and the 120MHz aerial band. Amphenol connectors, compared to the majority of connectors in circulation, allow a strong anchorage to the radio and to the aerial and don’t allow the antenna to turn on itself. It can be used in the RX part on amateur and civil radio links either in vocal or in digital way APRS included.
Ideal for listening to HF, 50 and 70MHz, Air band, NOAA, VHF, DAB, UHF, ADS-B and so on.
All the notch filters we produce are calibrated one by one in order to have the maximum attenuation at exactly 88.98 and 108MHz with a maximum error of 3%.
High Q inductances designed for our filters.
BNC Male 50 Ohm: Amphenol
BNC Female 50 Ohm: Amphenol
Cylindrical shaped structure made of anticorodal (6000 alloy) aluminum.
Black anodic anodization
Engraving with fiber laser
Attenuation at 88, 98 and 108 MHz => at 50dB
Amphenol BNC connectors
HI-Q RF 250V ceramic capacitors
This image represents the entire band from 88 to 108MHz without any notch filter installed.
This image instead represents the entire band from 88 to 108 MHz with our Notch 88 108 MHz filter inserted. As you can see the entire FM band has been attenuated.
HF/50MHz Band Attenuation of our notch 88 108 MHz filter.
Full Span from 5khz to 1.5 GHz. In black it is possible to observe the insertion loss while in blue its characteristic return loss.
As you can see from the chart above thanks to manual calibration you can adjust the deep exactly to 88, 98 and 108 MHz and not as happens on the filters of all the competition where the filter responses is different from each other because there is no possibility of calibration.