Nokta SX28 11" Waterproof DD Search Coil for Simplex LITE, BT, and ULTRA

If you're running a Simplex detector and want to cover more ground per session, the SX28 11-inch coil delivers both wider sweep coverage and deeper detection than the standard coil. The DD configuration handles mineralized soil better than concentric designs, making it a solid choice for relic hunting, coin shooting, and beach detecting where ground conditions vary.

What's included

• Nokta SX28 11-inch DD search coil
• Protective coil cover
• Complete mounting hardware kit

Why detectorists choose this coil

• Faster ground coverage: 11-inch sweep width means fewer passes to cover the same area.
• Deeper target detection: larger electromagnetic field reaches coins and relics the stock coil misses.
• Better performance in mineralized soil: DD configuration reduces ground interference that causes false signals.
• Hunt in any weather: fully waterproof construction handles streams, wet sand, and rain without worry.
• Protected from the start: included coil cover guards against rocks and debris during aggressive hunting.

When to upgrade to the 11-inch coil

The larger search pattern makes the SX28 ideal for open areas like fields, parks, and beaches where you want maximum depth and efficiency. In high-trash areas, a smaller coil may offer advantages, but for relic hunting on old homesteads or coin shooting in wide-open spaces, the 11-inch footprint is the right tool. The DD coil shape excels where concentric coils struggle, particularly in iron-rich soil or black sand beaches where mineralization causes standard coils to chatter.

We've used this coil in wet conditions without issue. The waterproof construction lets you hunt shallow water, wet sand after tide changes, and muddy fields after rain. The protective cover that comes in the box is worth using from day one, especially if you hunt rocky ground or dense brush where the coil takes a beating.

Installation and compatibility

The SX28 is a direct replacement coil with no modifications needed. The included mounting hardware connects to your Simplex's lower rod section. Installation is straightforward with the included hardware.

This coil is compatible with the FindX Pro and all Simplex series models: the Simplex LITE, Simplex BT, and Simplex ULTRA.

Field performance notes

In terms of target separation, the DD configuration maintains good precision even with the larger size.

Coil care and maintenance

The coil cover protects against scratches and damage when detecting.

Real-world use cases

Beach hunters appreciate the waterproof rating for surf hunting and wet sand work. The larger coil covers more ground during low tide windows when you're racing against the incoming water. Relic hunters use it in open fields where deeper targets like old coins and buttons sit below plow depth. Park hunters find it efficient for covering soccer fields and large grassy areas where targets are spread out.