Hi-VHF Crossed Folded Dipoles - TL=QWL

			• Public Gallery • Help

		• Join Now! • Log In • Feature Tour

Hi-VHF Crossed Folded Dipoles - TL=QWL

Hi-VHF Crossed Folded Dipoles (Cross-FD's) with 450-ohms Impedance Interconnecting
Feedline = Quarter-Wavelength Long (simulated by a TL Card) analyzed using 4nec2.
[In diagrams below, Feedline is NOT TO SCALE.]

With Quarter-Inch Copper Tubing (QICT), 2-in FD "Width" (distance between FD Elements)
and 2-in Separation between the Crossed FD's, a large Gain and SWR GLITCH was found
in the middle of the Hi-VHF Band, the placement depending on the overall FD Length:
177 MHz if 32-in, 202 MHz if 28-in, 209 MHz if 27-in, etc.

If the length of the Cross-FD's are much longer or shorter than when used alone, the GLITCHES
can be moved out-of-band. FD Length = 34-in or 24-in was barely sufficient to avoid the
GLITCHES, as shown below. The longer 34-in FD had 0.5 dB higher Gain and only slightly higher SWR.

They are followed by results for FD Length =27-in with Gain and SWR GLITCHES at 209 MHz.

Note that Right Hand Circular Polarization is strongest FORWARD, while Left Hand is strongest to REVERSE,
so VERY CAREFULLY check antenna connections and alignment. Reversing one interconnection reverses Polarization.

Poor Cross Polarization Loss on higher Hi-VHF channels and lack of LHCP suppression (Multipath) from REAR.

Date(s): 20 Jan 2012. Album by holl_ands. 1 - 75 of 75 Total. 2297 Visits.

enlarge 51KB, 1024x849 1 Hi-VHF Crossed Folded Dipoles - TL=QWL 3D View - Length = 34-in	enlarge 297KB, 1024x976 2 Hi-VHF Crossed Folded Dipoles - TL=QWL Front View - Length = 34-in [1 big box = 2.5-inches]	enlarge 61KB, 187x1024 3 Hi-VHF Crossed Folded Dipoles - TL=QWL Top View - Length = 34-in [1 big box = 2.5-inches]
enlarge 159KB, 1024x686 4 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Hi-VHF Raw Gain ~ 2.4 to 2.5 dBi	enlarge 167KB, 1024x686 5 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Hi-VHF SWR (300-ohms) Under 2.3	enlarge 145KB, 1024x686 6 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Hi-VHF Impedance
enlarge 335KB, 1024x1024 7 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 174 MHz	enlarge 335KB, 1024x1024 8 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 180 MHz	enlarge 332KB, 1024x1024 9 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 186 MHz
enlarge 326KB, 1024x1024 10 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 192 MHz	enlarge 322KB, 1024x1024 11 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 198 MHz	enlarge 317KB, 1024x1024 12 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 204 MHz
enlarge 316KB, 1024x1024 13 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 210 MHz	enlarge 324KB, 1024x1024 14 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Azimuthal Patterns at 216 MHz	enlarge 62KB, 180x1024 15 Hi-VHF Crossed Folded Dipoles - TL=QWL Side View - Length = 34-in [1 big box = 2.5-inches]
enlarge 336KB, 1024x1024 16 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns at 174 MHz	enlarge 339KB, 1024x1024 17 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns at 180 MHz	enlarge 338KB, 1024x1024 18 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns at 192 MHz
enlarge 339KB, 1024x1024 19 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns at 198 MHz	enlarge 338KB, 1024x1024 20 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns at 204 MHz	enlarge 339KB, 1024x1024 21 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns at 210 MHz
enlarge 340KB, 1024x1024 22 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns at 216 MHz	enlarge 414KB, 1024x1024 23 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in Circular Polarization Patterns - Ani-Gif	enlarge 28KB, 791x1024 24 Hi-VHF Crossed Folded Dipoles - TL=QWL Length = 34-in 4nec2 File - Gain and SWR are OK
enlarge 56KB, 1024x836 25 Hi-VHF Crossed Folded Dipoles - TL=QtrWL 3D View - Length = 24-in	enlarge 257KB, 1024x973 26 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Front View - Length = 24-in [1 big box = 2.5-inches]	enlarge 62KB, 233x1024 27 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Top View - Length = 24-in [1 big box = 2.5-inches]
enlarge 166KB, 1024x686 28 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Hi-VHF Raw Gain ~ 1.9 dBi	enlarge 169KB, 1024x686 29 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Hi-VHF SWR (300-ohms) Under 1.8	enlarge 147KB, 1024x686 30 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Hi-VHF Impedance
enlarge 334KB, 1024x1024 31 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 174 MHz	enlarge 331KB, 1024x1024 32 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 182 MHz	enlarge 334KB, 1024x1024 33 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 186 MHz
enlarge 342KB, 1024x1024 34 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 192 MHz	enlarge 342KB, 1024x1024 35 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 198 MHz	enlarge 338KB, 1024x1024 36 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 204 MHz
enlarge 333KB, 1024x1024 37 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 210 MHz	enlarge 337KB, 1024x1024 38 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Azimuthal Patterns at 216 MHz	enlarge 63KB, 221x1024 39 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Side View - Length = 24-in [1 big box = 2.5-inches]
enlarge 344KB, 1024x1024 40 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns at 174 MHz	enlarge 335KB, 1024x1024 41 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns at 186 MHz	enlarge 334KB, 1024x1024 42 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns at 192 MHz
enlarge 331KB, 1024x1024 43 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns at 198 MHz	enlarge 329KB, 1024x1024 44 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns at 204 MHz	enlarge 328KB, 1024x1024 45 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns at 210 MHz
enlarge 327KB, 1024x1024 46 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns at 216 MHz	enlarge 373KB, 1024x1024 47 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in Circular Polarization Patterns - Ani-Gif	enlarge 28KB, 791x1024 48 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 24-in - Below the Glitches 4nec2 File
enlarge 61KB, 872x1024 49 Hi-VHF Crossed Folded Dipoles - TL=QtrWL 3D View - Length = 27-in	enlarge 260KB, 1024x969 50 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Front View - Length = 27-in [1 big box = 2.5-inches]	enlarge 66KB, 242x1024 51 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Front View - Length = 27-in [1 big box = 2.5-inches]
enlarge 155KB, 1024x686 52 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Hi-VHF Raw Gain GLITCH near 209 MHz	enlarge 182KB, 1024x686 53 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Hi-VHF SWR (300-ohms) GLITCH near 209 MHz	enlarge 159KB, 1024x686 54 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Hi-VHF Impedance GLITCH near 209 MHz
enlarge 338KB, 1024x1024 55 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 174 MHz	enlarge 339KB, 1024x1024 56 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 180 MHz	enlarge 337KB, 1024x1024 57 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 186 MHz
enlarge 338KB, 1024x1024 58 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 192 MHz	enlarge 339KB, 1024x1024 59 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 198 MHz	enlarge 336KB, 1024x1024 60 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 204 MHz
enlarge 333KB, 1024x1024 61 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 209 MHz - GLITCH	enlarge 340KB, 1024x1024 62 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Azimuthal Patterns at 216 MHz	enlarge 62KB, 224x1024 63 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Side View - Length = 27-in [1 big box = 2.5-inches]
enlarge 332KB, 1024x1024 64 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 174 MHz	enlarge 329KB, 1024x1024 65 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 180 MHz	enlarge 327KB, 1024x1024 66 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 186 MHz
enlarge 327KB, 1024x1024 67 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 192 MHz	enlarge 329KB, 1024x1024 68 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 198 MHz	enlarge 331KB, 1024x1024 69 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 204 MHz
enlarge 328KB, 1024x1024 70 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 207 MHz RHCP = LHCP at 90-deg Azimuth, No Cross-Polarization Protection	enlarge 342KB, 1024x1024 71 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 209 MHz	enlarge 347KB, 1024x1024 72 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 210 MHz
enlarge 329KB, 1024x1024 73 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns at 216 MHz	enlarge 371KB, 1024x1024 74 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in Circular Polarization Patterns - Ani-Gif	enlarge 28KB, 791x1024 75 Hi-VHF Crossed Folded Dipoles - TL=QtrWL Length = 27-in - Gain & SWR Glitches 4nec2 File

Select All.

Sign the Guestbook. Displaying 1 of 1 entries.

cialis pas nher acheter cialis
cialis sans ordonnance cialis prix
comprar cialis precio cialis
acquistare cialis comprare cialis
- LonnieDipsy | http://acquistare-cialis-italia.net/, Wed, 21 Mar 2018 8:12AM