The BPF 70/4 is a 4 resonator ¼ λ band-pass filter with inductive coupling between the resonators.
This filter can be used as a preselector to protect a receiver from interference from transmitters outside the band-pass limits.
When installed at the output of a transmitter, the BPF 70/4 reduces spurious signals.
The BPF 70/4 is adjustable over the range 380 – 470 MHz.
Careful choice of materials ensures reliable functioning over a wide temperature range.
Extruded aluminium sections, steel racks and coax cables and connectors with teflon insulation ensure good mechanical strength.
The filter is coated with black vinyl to prevent corrosion.
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