2 meter Receiving Budget Band-Pass Filter with high selectivity
Low loss of filter achieved by careful design and adjustments.
| Electrical Specifications: | |
| Frequency range: | 144 – 148 MHz |
| Insertion Loss: | < 0.4 dB |
| Input return loss: | < – 20 dB |
| Nominal Impedance: | 50 Ohm |
| Connectors: | “N” |
| Attenuation of nearest band: | |
| 1.8 MHz | 97 dB |
| 3.5 MHz | 85 dB |
| 7.1 MHz | 75 dB |
| 14.15 MHz | 63 dB |
| 21.2 MHz | 58 dB |
| 28.4 MHz | 54 dB |
| 50 MHz | 46 dB |
| 54 MHz | 45 dB |
| 70 MHz | 40 dB |
| 70.5 MHz | 40 dB |
| 88 MHz | 35 dB |
| 98 MHz | 31 dB |
| 108 MHz | 27 dB |
| 144 MHz | 0.36 dB, RL = – 24 dB |
| 146 MHz | 0.37 dB, RL = – 24 dB |
| 148 MHz | 0.38 dB, RL = – 24 dB |
| 288 MHz | 44 dB |
| 432.1 MHz | 49 dB |
| 1296 MHz | 41 dB |
Metal box size: 85 mm x 50 mm x 40 mm.
Measurements: The recorded data on the assembled filter with HP8753ES full 2-port calibrated are presented.
1. Attenuation curves.
2. HF attenuation on 2 meter bandpass filter.
3. Attenuation on 50 MHz and 70 MHz for 144 MHz Budget Band-pass filter.
4. FM attenuation on 144 – 148 MHz bandpass filter.
5. Harmonic attenuation (suppression).
6. Flatness of 2m band-pass filter. S21 (Attenuation) is set to 0.5dB per div! Next graph shows excellent flatness across whole 2 meter band.
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 2 meter filters. We have 50 W, 100 W, 200 W, 300 W, 1500 W and 4000 W versions: 2 Meter Band-Pass Filters
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