70 cm 430 – 440 MHz 1 kW -0.06 dB Transmitting – Receiving Band-pass Filter with “N” connectors

With its extreme low insertion loss this filter could be used as transmitting and / or receiving filter in line with antenna.
– As transmitting to suppress any harmonics from 70cm up to 1kW linear amplifiers.
– On receive side before LNA to protect receive performance from any HF, FM 2m, 220 MHz or 23cm strong stations.

Filter is completely the same as 2.5 kW version except connectors (7/16DIN – “N”).

70cm-430-440MHz-Bandpass-Filter-1000W-70cm

Achieved results on a built Band pass filter:

Insertion loss (S21)	[dB]
1.8 MHz	< -110 dB
3.8 MHz	< -110 dB
7.1 MHz	< -108 dB
14.15 MHz	< -100 dB
21.4 MHz	-92 dB
28.4 MHz	-84 dB
50.1 MHz	-69 dB
70.2 MHz	-60 dB
88 MHz	-54 dB
144 MHz	-39 dB
146 MHz	-39 dB
148 MHz	-38 dB
220 MHz	-24 dB
225 MHz	-23 dB
430 MHz	-0.06 dB, Input RL batter than -34 dB
432.1 MHz	-0.06 dB, Input RL batter than -34 dB
440 MHz	-0.06 dB, Input RL batter than -34 dB
860 MHz	-26 dB
864.2 MHz	-26 dB
880 MHz	-27 dB
1240 Mhz	-64 dB
1296.1 MHz	-48 dB
Maximum Power Input at SWR:	[W]
1 : 1	1000 W
1 : 1.1.5	800 W
1 : 2	650 W
1 : 3	450 W

Measured data on the assembled filter with HP8753ES network analyzer full 2-port calibrated:

70cm Bandpass Filter 1000 W S11 S21

432MHz-Bandpass-Filter-1000W-S11-S21-Measured-Data

70cm Bandpass Filter High Power 1000W HF Suppression:

70cm Bandpass Filter High Power 1000W HF Suppression

432MHz Bandpass Filter 1 kW HF, 6m, FM Suppression:

70MHz Band-pass Filter 1000W 6m FM Suppression

432 MHz Band Pass Filter 1000 W 2m and 1.25m Suppression:

70cm-432MHz-Bandpass-Filter-1000W-144MHz-222MHz-Suppression

430 – 440 MHz Band-pass Filter 1 kW Measured Data zoomed characteristics. Insertion Loss is set to 0.2 dB! Excellent Band Flatness and supper low loss of BPF!