Nokta RC18C 7" Concentric Search Coil for Racer and Racer 2 Metal Detectors

The RC18C 7-inch concentric coil is compatible with the Nokta Racer and Nokta Racer 2 metal detectors. The coil uses a wired connection that plugs directly into the Racer series control box without requiring firmware updates or adapter hardware. This coil is designed specifically for the Racer series, making it a plug-and-play upgrade that ships ready to hunt. If you own a Racer or Racer 2 and want a smaller coil for trashy sites, the RC18C delivers enhanced target response and improved discrimination on shallow targets. You can browse the full range of metal detector search coils: DD, concentric, monoloop & SEF upgrades to compare coil configurations across brands.

The RC18C concentric coil performs best in ground with low to moderate mineralization, parks, schoolyards, freshwater beaches, and urban sites where iron content is minimal. Concentric coils deliver cleaner target signals and better discrimination on shallow targets in these conditions compared to DD coils, which are engineered to handle heavily mineralized ground. If you hunt saltwater beaches with black sand or inland sites with high iron content, a DD coil will give you more stable performance. The concentric configuration excels when target separation matters more than ground-balancing capability, so detectorists working trashy urban environments see the biggest advantage from the RC18C's focused detection field.

Smaller coils generally trade maximum detection depth for tighter target separation in trashy areas where multiple signals overlap. The RC18C's 7-inch diameter generates a more focused electromagnetic field, which lets you isolate a coin sitting 2 inches from a pull tab or foil wad, scenarios where a larger coil gives a blended audio response. Many shallow targets in parks and schoolyards benefit from this focused detection pattern, where the depth tradeoff rarely costs you finds in urban environments. The compact footprint also improves maneuverability around playground equipment, fence lines, and park benches where larger coils drag or catch on obstacles. The concentric design delivers cleaner signals for better target identification in low-mineralization ground.

The RC18C is waterproof and can be submerged during surf hunting or shallow creek work without damaging the coil housing or internal components. The waterproof rating supports wet-grass hunting, wading in calm surf, and rinsing the coil after beach sessions. Keep in mind that concentric coils perform best in low-mineralization ground, so heavily mineralized saltwater beaches with black sand will reduce the coil's discrimination advantage compared to a DD coil. Detectorists working freshwater beaches or low-mineral saltwater sites see strong performance from the RC18C in wet sand and shallow water. For those hunting harsher environments, you can explore our complete lineup of the best Nokta metal detectors built to handle heavy saltwater mineralization.

The RC18C excels in trashy urban sites where multiple targets sit close together, park benches, schoolyard perimeters, and fairgrounds. The concentric field pattern isolates signals from adjacent junk better than a DD coil in non-mineralized ground, letting you hear the dime under the aluminum scrap or the silver ring next to a bottle cap. Coin shooters working modern parks with moderate trash density see faster target recovery because the focused field reduces masking from adjacent targets. The 7-inch size also fits between playground equipment and fence posts where larger coils drag or bump. If you spend most of your time in low-mineral environments hunting shallow modern drops, the RC18C gives you cleaner audio and better discrimination than larger coil configurations.

No, the RC18C is completely plug-and-play. The wired connection interfaces directly with your existing Racer or Racer 2 control box right out of the box without requiring firmware updates. Because a concentric configuration inherently changes the architecture of your search field, you won't need specialized modes to separate targets. Simply run your preferred discrimination segments and sensitivity levels, adjusting normally for local ground noise as you hunt.

While your stock coil is built for maximum ground coverage and raw depth in open fields, the RC18C 7-inch concentric coil is a specialized tool for surgical trash separation. Swapping to this smaller footprint allows you to navigate dense iron trash, pull-tabs, and foil without your signals masking adjacent targets. It makes the detector lighter, highly maneuverable around physical obstacles, and much sharper on shallow jewelry and coins hidden in high-traffic parks.