219 MHz to 225 MHz Extreme Power Band Pass Filter 2000 W
1.25 meter Band Pass Filter uses high Q coils and capacitors with Q more than 1000. Low loss of filter achieved with careful design and adjustment.
Although intention of this filter is to be used as transmitting filter, design allows also to be used as receiving filter before wide band LNA to protect sensitive device from strong out of band signals.
This 222 MHz Band Pass Filter will suppress any signals from HF 1.8 – 28 MHz stations, 50-54 MHz, 2 meter and 70 cm – 432 MHz (430 – 450 MHz) stations.
Filter will reduce TVI problem or your problem with neighbors with strong RFI from HF, 6 meter 2 meter or 70 cm transmitters.
Achieved results on a built Band pass filter:
| Frequency |
Insertion Loss [dB] |
| 1.8 MHz | -106 dB |
| 3.8 MHz | -100 dB |
| 7.1 MHz | -100 dB |
| 14.15 MHz | -97 dB |
| 21.2 MHz | -87 dB |
| 28.4 MHz | -80 dB |
| 50.1 MHz | -64 dB |
| 70.2 MHz | -54 dB |
| 88 MHz | -46 dB |
| 108 MHz | -38 dB |
| 144 MHz | -23 dB |
| 219 MHz | -0.1 dB, Input RL better than -30 dB |
| 221 MHz | -0.08 dB, Input RL better than -33 dB |
| 222 MHz | -0.079 dB, Input RL better than -35 dB |
| 225 MHz | -0.079 dB, Input RL better than -35 dB |
| Harmonics | and interfering signals: |
| 432 MHz | -33 dB |
| 666.3 MHz | -56 dB |
| 1296.1 MHz | -30 dB |
Maximum Power:
| Maximum Power Input at SWR: | [W] |
| 1:1 | 2000 W |
| 1.1.5 | 1500 W |
| 1:2 | 1200 W |
| 1:3 | 1000 W |
Measured data on the assembled filter with HP8753ES network analyzer full 2-port calibrated:
1.25 meter Band Pass Filter 219MHz to 225MHz 2000W Measured HF Attenuation
222 MHz Band Pass Filter 2kW Measured HF 6m 4m FM Attenuation
1.25m Band Pass Filter 2kW Measured 6m 4m 2m 222MHz and 70cm Attenuation
1.25 meter 222 MHz High Power Band Pass FIlter 2kW Low Insertion Loss fan cooled
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