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.

Bandpass filter is perfect for multi-station environments like special events, field days, and portable operating to protect receivers from excessively strong out-of-band signals. Our 80-meter filter is designed to have an 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 bandpass filter is declared at 4000 W, but the filters are designed for more power than presented. The Bandpass filter is placed in a powder-coated aluminum box. Silver-plated SO239 connectors and excellent filter design enable extremely low losses through an 80-meter band and high attenuation of out-of-band signals.

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

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

 

 

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

 

 

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.

 

 

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

 

 

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

 

 

Electrical Specifications 80-meter Bandpass Filter

Frequency Range: 3.5 MHz – 4 MHz
Insertion Loss: < 0.12 dB
Input Return Loss: -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 the longest side without a fan.

 

Similar HF Band Pass filters:

160-meter band: 160-meter High power band pass filter – 4 kW

40-meter band: 40-meter High power band pass filter – 4 kW

20-meter band: 20-meter High power band pass filter – 4 kW

15-meter band: 15-meter High power band pass filter – 4 kW

10-meter band: 10-meter High power band pass filter – 4 kW