Cubical quad gain portable#
Yagi - Why go for a quad rather than a yagi Two portable antennas for 6-meter - VE7CA reprint an interesting article taken from arrl antenna compendium. Performance considerations, detailed pictures and construction notes.
Ray built hundreds two meter quads in single and paired configurations as well as his famous mobile radio direction finding quad. Includes design for 2 6 10 12 15 meter bands [ Hits: Votes: 59 Rating: 4. A backpack antenna that is easy to put together in just minutes and parts store inside the boom making it ready for travel or storage.Īt about half the cost of a tri-band yagi, you get five band coverage with a single coax feedline and excellent performance from a light, low wind load antenna.
Cubical quad gain pdf#
Quad Antenna System by Pfeiffer Maltese Excellent Quad Antenna projects for 40 20 17 12 10 and 6 meters band in this pdf file project by Pfeiffer Maltese Boomless quad antenna VU2GX Girimajij article on boomless quad antennas Cubical Quad Antenna Design By N6VNG, can be used to determine the element lengths and the gamma match values for different frequencies, includes link to excel files with formulas to dimension your quad antenna.
Graph, Plot and 7 element quad photo used with permission by Franco IZ1RZOĭrawing used with permission by Buck Rogers Sr.Includes design for 2 6 10 12 15 meter bands 2 element Quad antenna for 10 12 15 mt Detailed instructions about a home made 2 element quad antenna made in diamond configuration, resonating on 10 12 and 15 meters band, by IZ7ATH Talino Quad calculator Cubical quad antenna calculator in java script let you calculate elements size and spacing in inch and meters. However, the tuning and matching may interlock to some extent, and it is usually necessary to run through the adjustments several times to insure that the best possible tuning has been obtained. The impedance of the driven element also varies with the tuning and spacing, and thus the antenna system must be tuned to its final condition before the match between the coax and the antenna can be completed. The maximum front to back ratio seldom, if ever occurs at the same condition that gives maximum forward gain. The gain of an antenna with parasitic elements varies with the spacing and tuning of the elements, and thus for any given spacing there is a tuning condition that will give maximum gain this spacing. Using THHN wire may have a higher resonant frequency, adding 1% to the lenghts when using THHN wire should work well. The velocity ratio is close to 99% and because of the adjustments needed because of the antenna surroundings, the measurements calculated should be really be close enough to start your adjustments. There is no need to adjust the calculations for using insulated wire. Feed line is made out of standard coaxial cable (RG8/RG58) 50ohm unbalanced, to attach this feed line to the balanced drive element (Quad loop) without proper matching is not advisable, instead use an 1:1 balun, (however I rarely use a balun )ġ6 gauge to 10 gauge wire will work best. If tuning gap is present on the parasitic elements, doesn't the placement of this gap effect the polarization. Horizontal or vertical polarization of an cubical QUAD-Antenna is determined by placement of the feed point (feed gap on the driven element) - Parasitic elements need to be mounted in the same orientation as the driven element. Reflector To Driven Element_ inches cmĭriven element To First Director_ inches cmĭirector To Director_ inches cm Directors Optional Quad Antenna JavaScript Calculator for CB and Amateur Radio Communications JavaScript Cubical Quad Antenna Calculator Quad Antenna Calculations
0 kommentar(er)
