The Diamond SS770R is a high-precision phasing harness engineered to phase together two directional beam or yagi antennas across the 2-meter (144 MHz) and 70-centimeter (430 MHz) amateur radio bands. Designed as the dedicated phasing solution by Diamond Antenna for antenna stacking, it allows operators to combine matching beams—such as the Diamond SB144 and SB430—ensuring symmetrical signal distribution and balanced 50-ohm impedance matching to the main transmission line.
Built with low-loss coaxial phasing sections and high-grade connectors, the SS770R effectively sums the effective radiated power of two beam antennas while narrowing the main beamwidth in either the horizontal or vertical plane. This configuration delivers a substantial increase in forward gain and sharpens front-to-back discrimination against unwanted off-axis noise, making it an essential setup for VHF/UHF DX communications, amateur satellite tracking, and contest operations.
Key Advantages
- Factory-Calibrated Phasing: Specifically engineered to combine two directional antennas in phase on 144 MHz and 430 MHz without complicated manual trimming.
- Optimized for Diamond Beam Systems: Seamlessly matches stacked setups utilizing Diamond SB144 (2 m) and SB430 (70 cm) directional beams.
- Increased Gain and Directivity: Combines the aperture of two antennas to focus radiation patterns and extend reaching power on long-haul contacts.
- Low-Loss RF Design: Precision termination and reinforced shielding minimize insertion loss and preserve weak signal reception on VHF and UHF.
- Weatherproof Reliability: Durable outer materials designed to endure continuous outdoor exposure on towers, crossbooms, and antenna masts.
Recommended Applications
VHF/UHF Directional Stacking Systems
Combines two identical beam antennas horizontally or vertically to boost signal punch on 2m and 70cm weak-signal SSB and CW DX modes.
Amateur Satellite Tracking and EME Work
Ideal for stations requiring enhanced directional gain, tighter lobe control, and lower side-lobe noise when tracking low-Earth orbit satellites or working marginal links.
Contests and Field Day Deployments
Enables quick, reliable dual-beam array deployment on portable masts without needing to build custom phasing lines in the field.
Technical Specifications
| Feature | Specification |
|---|---|
| Brand | Diamond Antenna |
| Model | SS770R |
| Component Type | 2-Way Directional Antenna Phasing Harness |
| Operating Bands | 2 Meters (VHF / ~144 MHz) and 70 Centimeters (UHF / ~430 MHz) |
| Primary Compatibility | Directional beam antennas (optimized for Diamond SB144 and SB430) |
| System Impedance | 50 Ω |
| Application | In-phase stacking of 2 beam antennas |
Key Highlights
- Original Diamond Antenna phasing harness for stacking 2 beam antennas.
- Rated for operation on both 2m (144 MHz) and 70cm (430 MHz) bands.
- Tailored for coupling antennas such as the Diamond SB144 and SB430.
- Guarantees phase balance and matched 50-ohm line impedance.
- Robust, low-attenuation coaxial assembly built for demanding weather conditions.
Package Contents
- 1x Diamond SS770R Phasing Harness.
Frequently Asked Questions
What is the benefit of stacking two antennas with the Diamond SS770R?
Stacking two identical beams with a phasing harness adds forward gain (approximately +3 dB over a single antenna) while narrowing the radiation lobe, resulting in greater reach and improved rejection of off-axis interference.
Can antennas for different frequency bands be combined with this harness?
No. For proper phase balance and impedance matching, the two antennas connected to the harness must be identical models tuned to the same operating band (e.g., two 144 MHz beams or two 430 MHz beams) and mounted at the recommended stacking distance.
