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Check the listing for details. 3.8MHz Band Pass Filter 200W for Shortwave Communication Radio Accessory. Condition: New. Listed at 76.00 USD. A higher isolation bandpass filter (BPF) is suitable for situations where two or more shortwave radios share a pair of multi band shortwave antennas and need to work simultaneously. 3.8MHz Band Pass Filter 200W Anti-interference BPF for Shortwave Communication Radio Accessory.