Product Overview
The MNL-FILTER-769-861-NF is a high-performance 50W RF Cavity Filter featuring a sophisticated triple-passband design (769-775, 799-816, and 851-861MHz). This filter is engineered to provide exceptionally narrow passband selectivity with low insertion loss (≤1.5dB) and high stopband attenuation. With its Low PIM (-150dBc) and IP67 waterproof rating, it is ideally suited for public safety, carrier-grade DAS, and in-building solutions where transmitter isolation and receiver sensitivity are paramount.
Technical & Mechanical Specifications
| Model No. | MNL-FILTER-769-861-NF |
| Frequency Range (MHz) | 769-775 & 799-816 & 851-861MHz |
| Insertion Loss(dB) | ≤1.5dB |
| External Inhibition(dB) | ≥30 @ 788-798 & 758-768MHz |
| Return Loss / VSWR | ≤-18dB / 1.30 |
| Intermodulation (dBc) | ≤-150 (with 2x20W) |
| Input Power | 50W |
| Impedance | 50 ohms |
| Operating Temp Range | -10℃ to +55℃ |
| Storage Temperature Range | -20℃to +85℃ |
| Relative Humidity | 5%-95% |
| Application / IP Grade | Indoor or Outdoor (IP67) |
| Dimension (mm) | 333*310*82 (Body Only) |
| Connector Type | N-Female |
| Color | Pantone 200C Red |
| Packing | 1 Pce in box |
NOTE: This filter is highly customizable. Frequency bands, inhibition levels, and connector types can be tailored to specific customer requirements. Our 50W cavity filters are engineered for 2G/3G/4G/5G/LTE coverage with a focus on high stopband attenuation.
Frequently Asked Questions
- Q1: What is the advantage of the triple-passband design (769-861MHz ranges)?
- A: This multi-band cavity filter is specifically designed to support multiple public safety and carrier frequency allocations simultaneously. It allows for the filtering of discrete bands while providing sharp External Inhibition (≥30dB) in the gaps between them, protecting against interference from adjacent LTE or radio services.
- Q2: How does the Low PIM (-150dBc) rating improve system performance?
- A: Passive Intermodulation (PIM) can create background noise that masks weak signals. A rating of -150dBc (tested with 2x20W) ensures the filter does not generate its own interference, which is critical for maximizing the sensitivity and range of receivers in high-traffic DAS environments.
- Q3: What makes the IP67 rating important for this cavity filter?
- A: An IP67 rating means the filter is completely dust-tight and can withstand temporary immersion in water (up to 1 meter). This is far superior to standard IP65 ratings, allowing the filter to be installed in flooded pits, coastal areas, or extreme outdoor environments without performance degradation.
- Q4: Why use an N-Female connector for a 50W filter?
- A: The N-Female connector is the industry standard for medium-power RF applications up to 11GHz. it provides a secure, weatherproof connection and is physically robust enough to handle the 50W input power while maintaining a low VSWR (≤1.30) across all three passbands.
- Q5: How does this filter improve the isolation of transmitters?
- A: When antennas are mounted close together, transmitters can interfere with each other. This cavity filter provides high stopband attenuation, ensuring that only the desired frequencies are transmitted. This increases isolation, prevents intermodulation between transmitters, and protects sensitive receiver inputs from overload.
Mechanical Drawing
