PRODUCT OVERVIEW
The GPIO Labs 144–148 MHz Bandpass Filter protects 2m band receivers from out-of-band interference — strong FM broadcast, cellular, and adjacent-service signals that desensitize front-end amplifiers and mask weak signals.
Passband covers 144–148 MHz (North/South America, Hawaii, Asia, Oceania) and 144–146 MHz (Europe, Africa, Russia), matching regional 2m allocations for amateur radio, satellite communications, APRS, and VHF land mobile use.
Typical applications:
- 2m amateur radio receive front-end protection
- VHF satellite ground stations and APRS digipeaters
- SDR receivers requiring FM broadcast rejection
- Repeater and base station installations
Housed in a compact enclosure with SMA-F connectors for easy inline integration. An unenclosed board-only version is also available for embedded/OEM designs.
SPECIFICATIONS
| Frequency (MHz) | Typical Attenuation (dB) |
|---|---|
| 10 | 90 |
| 20 | 85 |
| 30 | 75 |
| 40 | 70 |
| 50 | 70 |
| 60 | 60 |
| 70 | 60 |
| 88 | 45 |
| 98 | 39 |
| 108 | 28 |
| 118 | 16 |
| 128 | 5 |
| 144 | 2.8 |
| 146 | 2.8 |
| 148 | 2.8 |
| 167 | 5 |
| 200 | 24 |
Related Products
- This is a 144-148 MHz Filtered Low Noise Amplifier. It is designed to improve the sensitivity of 2m band receivers.
