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holl_ands | Home > Circular Polarized incl. Rabbit-Ears > Crossed Dipoles > Browse:Hi-VHF Crossed FD's - 2TL=QWL+HWLHi-VHF Crossed Folded Dipoles - TL=QWLHi-VHF Folded-Dipole-Pair - Cir. Polar.Hi-VHF Dipole-Pair - K6STI's Cir. Pol.
Hi-VHF Dipole-Pair - K6STI's Cir. Pol. Hi-VHF Crossed Dipole-Pair with Right Hand Circular Polarization analyzed using 4nec2. Derived from K6STI's VHF Dipole-Pair, found as cirdip3.nec in 4nec2's c:\nec2\models\VHFsimple sub-directory, as well as here: http://heplx3.phsx.ku.edu/~dzb/antcal/nec-files/circdip3.nec. Rescaled so that Left Hand Circular (Cross) Polarization is MINIMUM at 90-deg azimuth on 198 MHz. Provides very good Right Hand Circular Polarization performance, with Left Hand (Cross) Polarization difference between 6 dB (at band edges) and 20+ dB at 198 MHz.  Gain is between 0.7 dBic (low freqs) and 2.1 dBic at 198 MHz. SWR (75-ohms) is excellent, under 1.8. Note that Right Hand Circular Polarization is strongest FORWARD, while Left Hand is strongest to REVERSE, so VERY CAREFULLY check antenna connections and alignment. Poor Cross Polarization Loss on high & low Hi-VHF channels and lack of LHCP suppression (Multipath) from REAR. Date(s): 16 Jan 2012. Album by holl_ands. 1 - 20 of 20 Total. 2397 Visits.
enlarge 33KB, 1024x949 1 Hi-VHF Dipole-Pair - RtCirPolar 3D View enlarge 238KB, 1024x831 2 Hi-VHF Dipole-Pair - RtCirPolar Front View [1 big box = 2.5-inches] enlarge 44KB, 150x1024 3 Hi-VHF Dipole-Pair - RtCirPolar Top View [1 big box = 2.5-inches] enlarge 131KB, 1024x686 4 Hi-VHF Dipole-Pair - RtCirPolar Hi-VHF TOTAL Raw Gain ~ 2.2 dBi enlarge 184KB, 1024x686 5 Hi-VHF Dipole-Pair - RtCirPolar Hi-VHF SWR (75-ohms) under 1.8 enlarge 147KB, 1024x686 6 Hi-VHF Dipole-Pair - RtCirPolar Hi-VHF Impedance enlarge 336KB, 1024x1024 7 Hi-VHF Dipole-Pair - RtCirPolar Total, Horiz. & Vert. Azimuthal Patterns at 174 MHz Horizontal Gain much stronger than Vertical. enlarge 327KB, 1024x1024 8 Hi-VHF Dipole-Pair - RtCirPolar Total, Horiz. & Vert. Azimuthal Patterns at 198 MHz Horiz. & Vert. Gains about Equal at 90-deg & 270-deg. enlarge 322KB, 1024x1024 9 Hi-VHF Dipole-Pair - RtCirPolar Total, Horiz. & Vert. Azimuthal Patterns at 216 MHz Vertical Gain much stronger than Horizontal. enlarge 331KB, 1024x1024 10 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 174 MHz Right Hand Circular stronger FORWARD. Left Hand Circular stronger to REVERSE. enlarge 329KB, 1024x1024 11 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 180 MHz enlarge 329KB, 1024x1024 12 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 186 MHz enlarge 325KB, 1024x1024 13 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 192 MHz enlarge 326KB, 1024x1024 14 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 198 MHz Left Hand Circular (Cross) Polarization is MINIMUM. enlarge 335KB, 1024x1024 15 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 204 MHz enlarge 340KB, 1024x1024 16 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 210 MHz enlarge 341KB, 1024x1024 17 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns at 216 MHz enlarge 397KB, 1024x1024 18 Hi-VHF Dipole-Pair - RtCirPolar Polarization Patterns - Ani-Gif Left Hand Circular (Cross) Polarization MIN at 198 MHz. enlarge 27KB, 791x1024 19 Hi-VHF Dipole-Pair - RtCirPolar 4nec2 File enlarge 45KB, 176x1024 20 Hi-VHF Dipole-Pair - RtCirPolar Side View [1 big box = 2.5-inches]
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