PRODUCT OVERVIEW
The GPIO Labs 144–148 MHz Bandpass Filter (board-only) 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.
This is the unenclosed board version, designed for integration into custom builds, embedded systems, and OEM designs where the filter is mounted inside an existing enclosure. SMA-F connectors.
This version of the filter includes an enclosure for standalone inline use.
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
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144–148 MHz Filtered Low Noise Amplifier — combines this filter's selectivity with gain, for improved receiver sensitivity in weak-signal 2m applications.
