Nokta C28 11" Search Coil for CF77 Coin Finder Metal Detector

The Nokta C28 11-inch search coil is compatible exclusively with the Nokta CF77 Coin Finder metal detector. This coil uses a wired connection and plugs directly into the CF77 control box without requiring adapter hardware. The C28 is not compatible with other Nokta detector models such as the Anfibio, Kruzer, Score, or Impact series, as each Nokta detector line uses a different coil connector and signal protocol. If you own a CF77 Coin Finder and want to expand your coil options, the C28 and the larger C45 17.5-inch coil are aftermarket search coils available for the CF77.

The C28 11-inch coil delivers deeper detection and wider ground coverage compared to smaller coils. The 11-inch diameter increases the electromagnetic field volume significantly, which pushes coin-sized targets deeper and covers more ground per sweep. The C28 maintains tight target separation even with the larger footprint, so you gain depth without sacrificing precision in trashy sites. Compared to smaller coils, the C28 offers enhanced depth while remaining maneuverable enough for productive searching in confined spaces.

The C28 coil is waterproof and can be used in wet conditions. The coil handles wet sand, shallow streams, and surf zones without issue, so you can hunt beaches, wade in shallow water, and detect in rain without damaging the coil. The waterproof construction makes the C28 a solid choice for beach hunters working the slope between dry sand and surf, where saltwater mineralization and wet conditions challenge standard coils.

Choose the C28 11-inch coil when you hunt trashy sites, confined spaces, or areas with moderate ground mineralization where target separation matters more than maximum depth. The C28 excels in old homesteads, school grounds, and parks where iron nails, bottle caps, and pull tabs litter the ground, because the smaller footprint isolates individual coin signals between trash targets. The C45 17.5-inch coil delivers maximum depth and ground coverage for wide-open fields and beaches, but the larger size makes it more sensitive to ground mineralization and harder to maneuver around obstacles. For more guidance on coil selection, explore metal detector search coils: DD, concentric, monoloop & SEF upgrades.

The C28 coil detects coins, jewelry, relics, and small gold nuggets with improved sensitivity over smaller stock coils. The 11-inch round configuration delivers consistent depth across the entire sweep, so you won't miss edge-of-sweep targets when you vary your swing angle. The C28 works with the CF77's discrimination settings, which means you can notch out iron and focus on high-conductivity targets like silver coins and gold rings. The coil's medium size balances sensitivity to small targets with the depth required to reach older coins below the trash layer at worked-over sites.

The C28 coil does not require adapter hardware and connects directly to the CF77 control box using the wired connection. Installation is straightforward: unplug the old coil, plug in the C28, and you're ready to hunt. The wired configuration provides reliable connection. The C28 is engineered specifically for the CF77 platform, so the signal protocol and discrimination settings work seamlessly without calibration or firmware updates.

The C28 is designed to work in various soil conditions. The 11-inch size is less sensitive to mineralization than larger coils like the C45 17.5-inch, which makes the C28 a better choice for red clay, volcanic soil, and saltwater beaches. Run your CF77's ground balance settings to null out the mineral signal, and the C28 will separate coin targets from the ground matrix. If you hunt extremely mineralized ground, consider starting with smaller coils and stepping up to the C28 once you've dialed in your ground balance settings.

The C28 coil package includes the Nokta C28 11-inch round search coil with a wired connection for the CF77 Coin Finder. Protective covers are available separately if you hunt in rocky terrain or abrasive conditions to prevent cuts and scratches that can damage the coil housing. The C28 is compatible with the CF77 Coin Finder. No additional accessories or adapters are required to install and use the C28.

The C28 coil can detect small gold nuggets and is suitable for gold prospecting in areas with moderate mineralization. The CF77 Coin Finder platform is designed primarily for coin and jewelry hunting, and the C28's 11-inch round configuration delivers good sensitivity to small gold targets in park and beach environments. If you hunt gold-bearing ground with heavy mineralization or need to detect sub-gram nuggets, a dedicated gold detector with higher operating frequencies and specialized ground balance will deliver better results. For general-purpose detecting that includes occasional gold prospecting, the C28 is a versatile choice.

Weighing approximately 1.7 pounds, the C28 search coil features an open-build, wired design engineered to minimize physical strain in the field. Because its weight is distributed evenly across the entire 11-inch diameter, it balances beautifully on the CF77's shaft without causing significant arm fatigue during long, multi-hour hunting sessions. If you are planning an all-day relic hunt and want to compare how this footprint handles structural balance against other setups, browse our complete selection of metal detector search coils or reach out directly to our team for specialized advice.

Contact us for warranty information on the C28 coil. Our team supports every Nokta metal detector and accessory we sell, and we answer technical questions about coil selection, installation, and performance from direct field experience. If you have questions about warranty coverage or return options for the C28, reach out to our team for specific details.