Omni-RF Loop-On-Ground Transformer (50 Ω, BNC)
Amateur operators often face high HF noise levels that obscure weak signals. The Loop-On-Ground Transformer decouples a ground-laid antenna loop from your receiver, reducing noise and boosting signal clarity.
This 50 Ω version with BNC output fits most receivers directly. Compact, durable, and efficient, it delivers clear gain across 160–30 m with minimal signal loss (< 1 dB).
Why Noise Reduction Matters for HF Receive Antennas
HF bands, especially 80 m and below, suffer from local electrical noise—power lines, appliances, and urban interference. A Loop-On-Ground antenna fed through an isolated transformer can cut noise drastically.
“At Omni RF HQ, noise on 80 m dropped from S9 + 10 dB to much cleaner levels, raising SNR by 3–6 dB.”
Clearer signals mean better copy, easier DXing, and faster station performance—especially useful during contests or weak-signal nets.
Features of the Omni-RF Loop-On-Ground Transformer
50 Ω Output with BNC Connector
Designed for 50 Ω receive-only receivers with a BNC input. No adapter is needed—just plug in and go. The BNC standard ensures consistent impedance across HF frequencies.
Optimized for Lower HF Band Performance
Built using low-loss Fair-Rite cores and a custom turns ratio tuned over six months. Delivers excellent performance on 160, 80, 60, and 40 m compared to earlier transformer designs.
Durable, Low-Profile Build for Outdoor Use
The 3D-printed ASA enclosure resists UV damage. Marine-grade stainless steel fittings and wing-nut terminals withstand outdoor weather. Each unit ships with a ground peg for stable installation in soft ground.
How to Install and Use with a Loop-On-Ground Element
Choose a square area—15 ft sides for a 60 ft loop, or 25 ft sides for a 100 ft loop. Position the transformer at a corner, connect the loop ends using ring-terminals, and secure with wing nuts.
Drive the ground peg to anchor the transformer and loop. Connect a BNC cable to your receiver and weatherproof the connection with tape or dielectric grease. Jumpers on the PCB allow future upgrades such as preamp or filter boards.
Benefits for Your HF Receive Setup
- Noticeably lower noise floor across HF bands.
- Improved signal-to-noise ratio makes weak stations easier to copy.
- Compact design—ideal for small gardens or restricted spaces.
- Rugged build ensures long service life outdoors.
- Expandable layout ready for add-ons such as preamps or filters.
