430 – 432 – 440 MHz High Selectivity, High Q, Super Low Loss Bandpass Filter
Band-pass Filter BPF uses high Q coils and capacitors with unloaded Q of more than 1500. Low loss of filter is achieved with careful design and adjustment. Best receiving RFI band pass filter designed for 70 cm band.
Positions of connectors are selected so that the filter can be directly connected to the coaxial relay. Band pass filter enclosed in strong 0.8 mm sheet brass box. Strong mechanics will ensure stability and longevity.
For this type of filter almost nothing will disturb noise performance of any wide band pre-amplifier which is especially important in terrestrial and EME communications. It will further ensure smooth operation in the presence of strong signals.
Mesured data:
| Frequency [MHz] | Attenuation [dB] |
| 1.82 MHz | > 100 dB |
| 3.8 MHz | > 100 dB |
| 7 MHz | 100 dB |
| 14 MHz | 95 |
| 21 MHz | 95 |
| 28 MHz | 81 |
| 50 MHz | 67 |
| 54 MHz | 64 |
| 88 MHz | 51 |
| 108 MHz | 45 |
| 144 MHz | 36 |
| 146 MHz | 36 |
| Band Frequency 430 MHz | 0.15 dB; S11 (Return loss): -35 dB |
| Band Frequency 432 MHz |
0.15 dB; S11 (Return loss): -35 dB |
| Band Frequency 440 MHz |
0.15 dB; S11 (Return loss): -35 dB |
| 880 MHz (GSM) | 20 dB |
| 960 MHz (GSM) | 25 dB |
| 1296 MHz | 43 dB |
Measured Return Loss – S11 (CH 1) and Insertion Loss – S21 (CH 2) with HP8753ES network analyzer.
Characteristics of 430 – 432 – 440 MHz Receiving Band pass filter:
Filter characteristics zoomed.
2. Filter characteristics for HF.
3. Filter characteristics on FM frequencies and 6 meter band.
4. Filter characteristics on UHF frequencies.
Feel free to send e-mail if you need something more specific.
All band-pass filters are here: HF, VHF and UHF Band-Pass Filters
Direct link to all 70 cm filters. We have 50 W, 100 W, 200 W, 300 W, 1000 W and 2500 W versions: 70 cm Band-Pass Filters
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