The Diamond SG7700 is a dual-band mobile antenna designed for vehicular installations across VHF (144MHz) and UHF (430MHz) bands. Built with a radialless design architecture, this antenna operates efficiently without requiring a physical ground plane connection from the vehicle chassis, stabilizing transmission parameters across various mounting locations. The base section terminates in a rugged MP (PL-259 style) RF connector to facilitate rigid mechanical and electrical connection to standard mobile cable mounts.
The antenna element features specific electrical wavelength configurations for each operating band to optimize radiation profiles. On the 144MHz band, it utilizes a 5/8 wave double C-Load radialless configuration providing a gain of 4.3dB. On the 430MHz band, it transitions to a 2x 5/8 wave C-Load radialless architecture, increasing the system gain to 6.8dB. With a maximum power rating of 150W FM, the system safely handles high-power mobile transceivers while maintaining a voltage standing wave ratio (VSWR) of less than 1.5:1 across its tuned operating window.
Features
- Radialless electrical architecture allows for installation without a direct metallic ground plane.
- Dual-band performance optimized for simultaneous or selective 144MHz and 430MHz frequency tracking.
- High-gain element configurations to enhance mobile signal propagation.
- Integrated MP connector base structure for high-tensile coaxial matching.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Diamond Antenna |
| Model Designation | SG7700 |
| Operating Bands | VHF (144MHz) / UHF (430MHz) |
| System Gain Metric | 4.3dB (144MHz) / 6.8dB (430MHz) |
| Maximum Power Rating | 150W (FM) |
| Electrical Type (144MHz) | 5/8 wave double C-Load radialless |
| Electrical Type (430MHz) | 2x 5/8 wave C-Load radialless |
| Nominal Impedance | 50Ω |
| VSWR Threshold | Less than 1.5:1 |
| Base Connector Type | MP (PL-259 compatible male profile) |
| Total Length | 1.27m |
| Net Weight | 350g |
Package Content
- 1x Diamond SG7700 Dual-Band Mobile Antenna Element Assembly
