80 meter 4000 W High Power Band Pass Filter for 3.5 MHz Band

High power 80 meter 3.5 – 4 MHz band pass filters for BIG GUNS.

Band pass filter is perfect for multi-station environment like special events, field day, portable operating to protect receivers from excessively strong out-of-band signals. Our 80 meter filter is designed to have extremely low loss from 3.5 – 4 MHz (80 meter band) and it is 0.1 dB! Out-of-band interference is extremely suppressed. The filter is ideal to be on both reception and transmission. The 80 meter band pass filter is declared at 4000 W, but filters is designed for more power than presented. Band pass filter is placed in a powder-coated aluminum box. Silver-plated SO239 connectors and excellent filter design enable extremely low losses through 80 meters band and high attenuation of out-of-band signals.

External and internal look from the 3.5 – 4 MHz band pass filter.

1. External look. Strong powder-coated aluminum box with silver-plated SO239 connectors. 12 V external powered fan for filter cooling is included.

3.5 MHz - 4 MHz Band Pass Filter

2. Internal look. Inside filter are high-Q coils.

Air coils. Not Ferites. 3.5 - 4 MHz BPF

The recorded data on the assembled filter with HP8753ES full 2-port calibrated.

1. 4000 W 80 meter 3.5 – 4 MHz band-pass filter S11 / S21 measurements . Part 1.

3.5 - 4 MHz Filter. S11 / S21 Characteristic from 1 - 30 MHz.

2. 4 kW 80 meter 3.5 – 4 MHz band-pass filter S11 / S21 measurements . Part 2.

3.5 - 4 MHz Filter. S11 / S21 Characteristic from 1 - 30 MHz

High power band pass filter 3.5 – 4MHz Power Derating Chart.

4 kW Band Pass Filter - Power Derating Chart and Label

Electrical Specifications	80 meter Band pass Filter
Frequency Range:	3.5 MHz – 4 MHz
Insertion Loss:	< 0.12 dB
Input Return Loss Batter Than:	-31 dB
Nominal Input Impedance:	50 Ohms
Attenuation on Nearest Band:	35 dB – 55 dB
Maximum Power Input at SWR 1:1	4000 W
Maximum Power Input at SWR 1:1.5	3500 W
Maximum Power Input at SWR 1:2	3200 W
Maximum Power Input at SWR 1:3	3000 W
Mechanical Specifications
Connectors:	SO239 Default or “N”, 7/16 DIN by Order*
Filter Size:	455 mm x 220 mm x 135 mm
Fan Power Consumption:	+12 V DC, 200 mA**
BandPass Filter Net Weight:	2.8 kg
Mounting:	Any position (5 mm hole)
Work Environment:	Indoor

*No price difference between SO 239 & “N” connectors. ** Fan usage is not required for power below 1500 W. Filter size measured on longest side without fan.

80-meter-Band-Pass-Filter-4kw-3.5-4MHz-RFI-Filter-Dimension