HAM Radio Loading Coil

prusaprinters

<p>This is my <strong>prototype</strong> version of a DIY Loading Coil for HAM Radio. <strong>(UNTESTED)</strong></p><p>It is a glue together design for the 3 main coil parts (bottom_coil, main_coil, and top_coil).&nbsp;</p><p>The coil caps, and radial ring can be screwed on and off via the printed threads. so you can assemble/disassemble as necessary.</p><p>The coil can be extended by printing two main_coils and an extension_sleeve.</p><p>Requires a SO-239 bulkhead/surface connector, wires, nuts, bolts, washers, alligator clips, solder, etc. Once it has been tested, I will update with a BOM.</p><p>Threads for the two caps are 3/8x24 so you can screw a whip of your choice to the top and connect it how you see fit to the coil.</p><p>The radial ring has space for up to 12 radials.</p><p>Bottom_coil_cap-No-Threads has the 3/8x24 threads removed. Can be used as a base in conjunction with the spike_half. Print two spike halfs laying down, and glue them onto the no-thread cap. So you can plant the coil directly in the ground.</p><p><i><strong>I am currently in the testing phase, and have not field tested the unit yet. Do so at your own risk.</strong></i></p><p><strong>Note design was completed with imperial units, adjust accordingly</strong></p><p>Update 1/27/2022:&nbsp;</p><ul><li>Replaced top_coil with one that has the proper threads to match the top_coil_cap.&nbsp;</li><li>Added a second bottom_coil_cap-No_Threads which has the 3/8x24 threads removed.</li><li>Added a Spike_Half.</li></ul><p>Update 3/9/2022:</p><ul><li>Added additional top_coil_bolted which was modified to accept M5 bolts instead of glueing to the main_coil.</li><li>Added additional main_coil_bolted which was modified to accept M5 bolts instead of glueing to the main_coil. Note: The main_coil_bolted is not able to be used in a double stack variation with the extension_sleeve.</li><li>Added bottom_coil_flush with the four holes for the SO-239 connector removed so you can drill your own to match your specific hardware. User experience noted there were some variations in hole spacing.</li></ul>