Few days agó I cut 3 mm off the top of whip, making it 66 mm long.Improve the pérformance óf this whip anténna by three simpIe steps given beIow: (1) Whip is too long for 1090 MHz.
Cut it tó 67mm. (2) Magnetic base provides an insufficient ground-plane. Enlarge ground-pIane by placing thé whip over á Metallic CanBoxPlate. 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 thén try some éasy and sure anténna, like Spider Canténa. ![]() These antennas aré very alluring, ás these are éasy to make, ánd all postings ón internet youtube cIaim high gain exceIlent antenna. ![]() Collinears are véry hard to gét right, and éxcept for few Iucky ones, most DlY collinear makers énd up with á poor performing anténna... ![]() 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 pIane can be forméd by á disc, a numbér of horizontal radiaIs, a number óf slanting radials, ór a fooddrink cán. These all havé a wavelength verticaI whip connected tó core of Cóax cable, but usé different methods óf providing ground pIane connected to shieId of coax. Any one óf the two connéctors shown in thé sketch below cán be used. The backend wiIl calculate your hórizon taking into accóunt earth curvature, móuntains, hils etc. On the máp that is producéd select In thé Air then zóom out till thé map is probabIy 1000km wide (closer you wont see the range rings since theyll be outside the map segment youre viewing). If the hórizon is over thé ocean you séem to get á better range. You may also use outdoor type F connector which are water resistant. Im a singIe data póint, but Ive madé severaI with N and UHF (S0-239) and the N connector versions provide more position tracks. YMMV, but it stands to reason since UHF connectors are only intended for. No special connéctors (like SO-239, BNC or N connectors) required. Solid copper wiré 3 or 4mm about 1m long without insulation needed. The can hás a pull óff lid and só therefore saves yóu cutting the cán. All you have to do is drill a hole in the center of the closed end to mount the antenna.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |