Ads B Antenna Diy3/27/2021
Improve the performance of this whip antenna by three simple steps given below: (1) Whip is too long for 1090 MHz.Cut it to 67mm. (2) Magnetic base provides an insufficient ground-plane.An added advantage of placing whip over an ironsteel can is that whips magnetic base will cling to the can and keep the whip stable upright.Signal is weak indoors.
You can then try some easy and sure antenna, like Spider Cantena. Ads B Antenna Diy How To Make InstructionsIn next two posts below, there are how to make instructions for Spider Cantenna. The problem shows up when these antennas are put to service, and give poor perfamance. Collinears are very hard to get right, and except for few lucky ones, most DIY collinear makers end up with a poor performing antenna... EASY ANTENNAS FOR BEGINNERS The main disadvantages of stock antenna supplied with DVB-T USB Dongle are: Problem (1): It has a very short lead. Due to this, in most cases the antenna cannot be placed at an optimum location. Problem (2): The stock antenna is not optimized for 1090 Mhz. The ground plane can be formed by a disc, a number of horizontal radials, a number of slanting radials, or a fooddrink can. These all have a wavelength vertical whip connected to core of Coax cable, but use different methods of providing ground plane connected to shield of coax. Any one of the two connectors shown in the sketch below can be used. The backend will calculate your horizon taking into account earth curvature, mountains, hils etc. On the map that is produced select In the Air then zoom out till the map is probably 1000km wide (closer you wont see the range rings since theyll be outside the map segment youre viewing). If the horizon is over the ocean you seem to get a better range. You may also use outdoor type F connector which are water resistant. Im a single data point, but Ive made several with N and UHF (SO-239) and the N connector versions provide more position tracks. YMMV, but it stands to reason since UHF connectors are only intended for. No special connectors (like SO-239, BNC or N connectors) required. Solid copper wire 3 or 4mm about 1m long without insulation needed. The can has a pull off lid and so therefore saves you cutting the can. All you have to do is drill a hole in the center of the closed end to mount the antenna.
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