Скачать с ютуб Building a LoRa APRS Ground Plane Antenna in just two hours! в хорошем качестве

Building a LoRa APRS Ground Plane Antenna in just two hours!

Details, bill of materials, STL-files for the 3D-printed parts and more on GitHub: https://github.com/LB5JJ/433MHz-GP-An... Continuing my journey into LoRa APRS it was about time for my iGate / Digipeater to get it's own antenna. So far it's been connected to the X50 I normally use for 2m/70cm FM. After evaluating many potential designs, from a regular vertical dipole to a j-pole, I settled on the venerable ¼λ (quarter wavelength) ground plane antenna. For my use case, this has the perfect combination of a high gain and a high enough WAF (wife acceptance factor). The traditional design usually calls for 4 radials, pointing downward at a 45° (more strictly 42°) angle for the best match to a 50Ω coaxial cable. The dimensions given during the build turned out to be to long, and I ended up cutting 27mm of the radials and 5mm of the vertical element. Thus the finished project, that showed an SWR of less then 1:1.2 at 433.775MHz, was as follows: Radiator: 159mm Radials: 157mm 00:00 - Introduction 01:10 - Bending the radials 02:55 - Cutting the radials to length 07:00 - Putting the inserts into the radials 11:00 - Cutting the main radiating element 13:00 - Putting the inserts into main radiating element 14:10 - Drilling the holes in the mast/support 18:05 - Preparing the coax feed line 24:30 - Making the choke 25:55 - Putting in the top insert and coax 29:12 - Installing the main radiating element 33:00 - Attaching the BNC at the bottom 40:35 - SWR and final thoughts