COIL DESIGN COMAPRISON

Here is an example to rebuke claims made against our coil design. We groove our coil for proper spacing and placement of our high quality heavy duty stainless steel wire. Claims made that how we groove our core degrades the schd 40 PVC by 30% is unwarranted and false. We shave off 1/64 off the core; this is measure using a caliper.

We tested many different cutting depths until we found the perfect match that gave us the spacing we needed for the wire without compromising the PVC strength for mounting any size antenna whip. Without sophisticated tensile testing equipment we attempted to crush or bend our grooved core against a non-grooved core by squeezing with a table vise. There was no difference between either core.

Here is an example of their coil that was taken off my Jeep after just 6 months of use and weathering,

and our coil, also mounted on our Jeep for over 6 months. Notice the difference in corrosion.

Corrosion has a negative affect on your antennas performance and SWR.

Both coil samples were mounted on the same mount using the same whip element.

Our tuning couplers are made using a heavy gauge stainless steel pick up clip. The clip is drilled and tapped to accommodate a #6 stainless steel machine screw. The coupler is also drilled and tapped to allow a secure bonding of the pick up clip and shortening wire. Finally a steel #6 nut is used to lock everything together. The stainless steel clip against the stainless steel coil wire helps reduce corrosion between metals, thus a lower stable SWR. A nylon set bolt is added on our mobile coils to avoid any accidental changes of the tuning coupler once adjusted.

Lastly we use high grade stainless steel wire in our coils. At the HF frequencies using this amount of stainless verses other materials like copper has a nominal affect, and with the advantage of being corrosive resistant you get the maximum signal at your antenna. Stainless steel has the properties of being able to reform a protective layer once scratched. Sliding a tuning coupler up and down on other materials slowly erodes their protective coating thus causes corrosion which can cause arcing or burn outs. In addition a simple wiping the coil with a dry cloth will get rid of any of the bugs or other road debris you’ll collect. You coil will look shinny and new for years to come.