When it comes to setting up a reliable antenna for your car fire scanner, the NMO mount stands out as a robust and favored option. Known for its durability and waterproof nature when correctly installed, the NMO mount, or “New Motorola” mount, provides a secure and lasting base for your antenna. While the design has been around for decades, its effectiveness and ease of use have cemented its place as a top choice for many. If you’re looking to install an NMO mount for your car scanner antenna, this guide will walk you through the essential steps to ensure a successful and weather-resistant setup.
Installing an NMO mount might seem straightforward, but a little guidance can go a long way, especially if it’s your first time. Taking the time to understand the process and the nuances involved will help you avoid common pitfalls and ensure a professional-grade installation. Follow these steps to securely mount your fire scanner antenna using an NMO mount:
Step 1: Drilling the Hole
The first step is creating the necessary opening in your vehicle’s surface. You’ll need to drill a 3/4 inch hole to accommodate the NMO mount. Precision is key here, so measure carefully and ensure you’re drilling in the desired location for your antenna.
Step 2: Feeding the Coax Cable
Once the hole is drilled, the next step is to feed the coaxial cable through the hole from underneath the mounting surface. It’s crucial to remember to feed the coax cable upwards through the hole before you attempt to place the mount. The NMO mount is designed to be inserted from the top down and will not fit if you try to install it from underneath.
Step 3: O-Ring Placement – Ensuring a Waterproof Seal
A critical component for a waterproof installation is the o-ring on the NMO mount. Carefully inspect the o-ring and ensure it is properly seated in its designated groove on the mount’s ring. This small rubber ring is what creates the watertight seal, protecting your vehicle’s interior from water damage. The most common cause of leaks in NMO mounts is a pinched or damaged o-ring due to improper installation. Take your time with this step to avoid future issues.
Step 4: Using the Right Tools for Tightening
The NMO mount is designed with two small holes on the part where the coax cable attaches. These holes are intended for a specialized tool that prevents the mount from spinning as you tighten the retaining ring. If you don’t have this specific tool, a pair of needle-nose pliers works perfectly. Insert the tips of the pliers into these holes to hold the mount steady while you tighten the ring from above.
Step 5: Tightening the Retaining Ring – Finding the Right Balance
When tightening the retaining ring onto the mount, it’s essential to find the right balance. The goal is to compress the o-ring enough to create a waterproof seal and ensure the metal of the ring makes good contact with the vehicle’s metal surface. Over-tightening can lead to damage, potentially breaking the mount. Tighten the ring securely, but avoid excessive force.
Step 6: Wrench Size and Alternatives
The correct wrench size for the NMO mount retaining ring is 15/16ths. However, if you don’t have this specific size wrench readily available, a pair of channel-lock pliers can be effectively used as an alternative. Channel-lock pliers provide enough grip and leverage to tighten the ring securely without overdoing it.
By following these steps carefully, you can confidently install an NMO mount for your car fire scanner antenna. This robust mounting solution will provide a stable and weatherproof base, ensuring optimal performance for your scanner. Remember to always double-check your work and if you have any questions, don’t hesitate to seek advice from experienced installers or consult online resources for further guidance.
