Product Description
The MD-721-DF (Single Unit) and MD-721-DF-DU (Double Unit) are high-performance RF combiners designed for the 698-2170MHz frequency range. These units offer exceptional modularity and are built to withstand both indoor and outdoor environments with an IP65 waterproof rating. Featuring ultra-low insertion loss (≤0.25dB on Band 1) and high isolation between ports, this series is the ideal solution for co-locating different frequency bands while maintaining signal integrity with a PIM rating of -153dBc.
Technical & Mechanical Specifications
| Part Number | MD-721-DF (Single Unit) / MD-721-DF-DU (Double Unit) | |
| Electrical Parameters | Band 1 | Band 2 |
| Frequency Range | 698-960MHz | 1710-2170MHz |
| Return Loss | ≥20dB | ≥20dB |
| Insertion Loss | ≤0.25dB | ≤0.5dB |
| Power Handling | 200W | 200W |
| Isolation | ≥45dB @1710-2170MHz | ≥45dB @698-960MHz |
| DC Pass | 3A | 3A |
| PIM | -153dBc @ 2*43dBm | |
| Impedance | 50Ω | |
| Mechanical Parameters | Single Unit | Double Unit |
| Weight | 2.10kg | 4.20kg |
| Dimensions | 168*146*51mm | 168*146*105mm |
| Connector | DIN female | |
| Colour | Grey or customized | |
| Operating Humidity | 0-95% | |
| Operating Temperature | 0 to 55ºC | |
| Application | Outdoor | |
| Mounting | Pole or Wall Mount | |
| Waterproof Grade | IP65 | |
Frequently Asked Questions
- Q1: How does the MD-721-DF facilitate co-location in modern networks?
- This combiner simplifies infrastructure by merging 698-960MHz and 1710-2170MHz bands into a single antenna system. It significantly reduces feeder cables, which lowers site wind load, rental costs, and ongoing maintenance requirements.
- Q2: What ensures high signal coverage and integrity in this series?
- With an ultra-low insertion loss (≤0.25dB) and a superior -153dBc PIM rating, the unit maximizes signal coverage while minimizing intermodulation. Additionally, ≥45dB isolation effectively prevents cross-band interference between ports.
- Q3: Can this unit support active outdoor equipment like TMAs?
- Yes, it features an integrated 3A DC Pass capability on both bands. This allows the base station to provide power directly to Tower Mounted Amplifiers (TMA) through the RF path, eliminating the need for separate power cables.
- Q4: Is the MD-721-DF suitable for extreme environmental deployments?
- Absolutely. The unit is designed with an IP65-rated weatherproof housing, making it resilient in all climates. It is compatible with pole or wall mounting, ideal for rooftops, towers, and other exposed outdoor applications.
- Q5: What are the deployment advantages of the Double Unit (MD-721-DF-DU)?
- The Double Unit offers a modular, compact design that houses two independent combiners. This is particularly efficient for 2x2 MIMO systems or sites using dual-polarized antennas, providing high performance in a space-saving form factor.
Outline Drawings
