Biquad Antenna FPV 1.2GHz

thingiverse

Human Version 2 1280 MHz Biquad Available - https://www.thingiverse.com/thing:2519983 This thing is a biquad antenna for FPV flying that can be printed in three different frequencies: 1280 MHz, 1200 MHz & 1360 MHz. For a specific frequency, contact me and I'll send custom STL files easily. It's built using 18 AWG silicon wire together with a piece of coax cable. All dimensions have been taken from IBCrazy's work, for which full credit goes. More info can be found at RCGroups - https://www.rcgroups.com/forums/showthread.php?1328260-DIY-BiQuad-11dbi-antenna-tutorial%21 The SketchUp file is available to download if you want to make your own modifications. Parts 18 AWG Silicon Wire x 45cm - http://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR1.TRC0.A0.H0.Xsilicon+wire+18awg.TRS0&_nkw=silicon+wire+18awg&_sacat=0 SMA RG316 Coaxial Cable x 30cm - http://www.ebay.com.au/itm/10-15-30-50cm-1m-SMA-Male-Jack-to-Female-Nut-Extension-RF-Pigtail-Cable-RG316-/191490074919?var=&hash=item2c95b2a927:m:m7wcOaCmV65T-xtusEKsghQ M3 x 10mm Button Head Screw x 8 - http://www.ebay.com.au/itm/Qty-10-Button-Head-Socket-M3-3mm-x-10mm-Plain-Screw-Bolt-12-9-Grade-Black-/231618484358?hash=item35ed899886 Reflector Plate - Single-sided Copper PCB / Galvanized Steel Sheet (1200 MHz = 24.8cm x 24.8cm, 1280 MHz = 23.3cm x 23.3cm, 1360 MHz = 21.9cm x 21.9cm) Instructions Print the antenna frame and four matching frequency spacers. Cut the reflector plate to size (1200 MHz = 24.8cm x 24.8cm, 1280 MHz = 23.3cm x 23.3cm, 1360 MHz = 21.9cm x 21.9cm). Align the antenna frame in the middle of the reflector plate and mark the position of the frame center and four spacer holes. Drill 3mm holes through each mark on the reflector plate (enlarge the center hole if needed so that the coax cable can pass through). Remove the same length as the printer spacer from the coax cable outer sleeve. Insert the coax cable through the back of the reflector plate. Fold back 8mm of the ground shield. Solder all exposed ground shield (keeping it straight). Solder the ground shield to the reflector plate. Trim 2mm from the inner conductor shield and tin. Attach the spacers to the reflector plate using four M3x10mm button head screws. Insert 18 AWG silicon wire into the antenna frame, starting from the center wrap it right around through the channels. Solder the two ends of the wire together with 15mm of wire excess (this excess wire will be soldered to the coax ground shield later on). Attach the antenna frame to the spacers using four M3x10mm button head screws. Solder the joined antenna wire to the coax ground shield (be careful not to solder the inner conductor too). Perform a continuity check (test the coax fitting ground against the reflector plate and the antenna wire, make sure the coax inner conductor is not touching ground at this stage). Remove a small piece of the antenna wire silicon shield (directly opposite from the ground attachment) and solder the coax inner conductor to the exposed wire.