15 meter 4000 W High Power Band Pass Filter

High power 15 meter 21 – 21.45 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 15-meter filter is designed to have an extremely low loss from 21 – 21.45 MHz (15-meter band) and it is just 0.12 dB! Out-of-band interference is extremely suppressed. The filter is ideal to be on both reception and transmission. The 15-meter bandpass filter is declared at 4000 W, but the filter is 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 15-meter bands and high attenuation of out-of-band signals.

15 meter band pass filter

Electrical specifications.

Frequency Range: 21.0 – 21.45 MHz
Insertion Loss: 0.12 dB
Input return loss: – 35 dB
Attenuation on the nearest band: 35 – 55 dB
Nominal Impedance: 50 Ohm
Maximum Power Input at SWR 1:1: 4000 W
Maximum Power Input at SWR 1:1.5: 3200 W
Maximum Power Input at SWR 1:2: 2500 W
Maximum Power Input at SWR 1:3: 2000 W
Connectors: SO239 or “N”

Measured characteristics and graph. 1. Out-of-band measurements.

Ham Radio Bands and their Attenuation (more than)
160 meter: 65 dB
80 meter: 55 dB
40 meter: 40 dB
20 meter: 50 dB
10 meter: 65 dB

2. The recorded data on the assembled filter with HP8753ES full 2-port calibrated are presented below. This graph shows S parameters from a 15-meter bandpass filter from 1 MHz to 30 MHz. Insertion loss – S21 on main frequency is less than 0.12 dB!

21 - 21.45 MHz Filter. Measurements: S11 and S21. Extremely low loss.

Actual box size 15-meter bandpass filter. The filter is placed and closed with a strong aluminum box. The filter is designed and adjusted together with the box so that the shown and measured characteristics are identical.

4 kW 15 meter RFI filter dimensions