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diff --git a/2.-Direction-Finding-Quickstart-Guide.md b/2.-Direction-Finding-Quickstart-Guide.md index a640858..4120414 100644 --- a/2.-Direction-Finding-Quickstart-Guide.md +++ b/2.-Direction-Finding-Quickstart-Guide.md @@ -9,30 +9,22 @@ The following graphic is an overview of the entire system. # Setup Antenna Array We recommend only using a Uniform Circular Antenna (UCA) array unless you are more experienced. -**Quick Antenna Sanity Check:** Antenna hardware must be identical. Antenna cables must be of identical lengths and construction. +**Quick Antenna Setup Check:** Antenna hardware must be identical. Antenna cables must be of identical lengths and construction. ## Print Array Spacer -The antenna array must be sized correctly for your desired frequency. It is also recommended that you use an array spacer to precisely position your antennas. +You may wish to use our antenna spacing template which will help with accurate antenna placement. The more accurate your array, the better your results will be. -If you have a 3D printer you can use our .obj files for the individual arms and center pentagon that can be glued together. +Files for 3D printing and paper printing can be found in this repo at https://github.com/krakenrf/krakensdr_docs/tree/main/antenna_array -Array Arm: https://drive.google.com/file/d/1LsiqZolMU4og2NStPewQWhIh3z6N1zb5/view?usp=sharing -Array Middle Pentagon: https://drive.google.com/file/d/1fn4KO7orITNJWV99XJHYu8RlZgmTl6-5/view?usp=sharing +For both templates print the center pentagon and five arms separately, then glue them together. -If you don't have a 3D printer our paper template can be used and glued together as well. +**Each hole is spaced at 50mm radius intervals.** So you have radius spacings of 100mm, 150mm, 200mm, and 250mm. These spacings cover the following frequency range: -Array Arms: https://drive.google.com/file/d/16tjBljRIHRUfqSs5Vb5xsypVTtHK_vDl/view?usp=sharing -Array Middle Pentagon: https://drive.google.com/file/d/1ekBcr3fQEz1d8WlKEerOmj-JriCywHhg/view?usp=sharing - -**Each hole is spaced at 50mm radius intervals.** So you have radius spacings of 100mm, 150mm, 200mm, and 250mm. - -## Choose a correct radius for your frequency of interest -The array radius required will depend on the frequency range that you are interested in. Choose a multiple of 50mm close to your determined radius and enter it into the "Acceptable Frequency Range For a Fixed Array Radius". Ensure that the frequency you are interested in is within the green range. - -For example in the image below we have selected a 25cm/250mm array radius. The Excel calculator shows us that we can use frequencies between ~200 MHz - 500 MHz with this size. - - +100mm : 510 - 1275 MHz +150mm : 340 - 850 MHz +200mm : 255 - 637 MHz +250mm : 204 - 510 MHz ## Mount the antennas The image below explains how the antennas should be mounted. Make sure the array is as straight as possible. ANT-0 must connect to CH-0 on the KrakenSDR. ANT-1 must connect to CH-1 and so on. |