It was incredibly heavy and very quickly became a sagging and corroded eyesore on the corner. Being the crafty maker type I wanted to build my own antenna.
Collinear Antenna Ham Radio Antenna Ham Radio Antennas
Collinear 58-Wave Omni Antenna for 2 Meters.
2 meter collinear dipole. Horizontal X 2 Dipole dipole and traveling-wave vee were each fed withtwo equal length coaxial cables whose outer conduct. Simple j-pole antenna for 2 meter how to build a J-pole antenna for 2 meter band with many photos ecc. Shop for 2 Meter Antennas here.
A 2 meter 146 Mhz J-Pole antenna that is inexpensive and easy to build. The fix was to turn it into a collinear with the addition of a 180 degree phased stub between the two half-wave sections. Each pair of cables terminated abovegroundat the collinear output.
Z1with BLUE colour is the RG58 section which Ive described ïn the Gamma match Dipole page. Collinear arrays and stacked element arrays with gains ranging from 3 to 9 dB1. A couple of years ago I designed this antenna which had the good property of substantial low elevation gain and the model generated consistent and predictable 4NEC2 results.
10 element 13 dBd gain. I settled on a 2 meter vertical dipole. 2 Meter 54 Wave Antenna Revealed.
It can be mounted on a roof top for use as a fixed antenna and it also folds conveniently for travel making it an excellent backpack antenna. Performance of a 20 Meter Vertical Collinear Antenna. Aztech Communications Dipole Antenna Transmission1 Butternut 2mcv 2 Meters Collinear Antenna Hardsoft Products.
2-meter Two-element Collinear Antenna The phasing stub After reasonably straightening the 6 AWG wire bend the first right angle 47 12 from one end which will serve as the top end. 5 element 94 dBd Gain. These Collinear antennas are 4 Megs wide and must be supported at the top by a yard arm or tree limb.
Its wise to lake advertised claims with a grain of salt. WB3AYW 2 Meter Collinear Vertical - Improved Version. 2 Meter 440 Vertical Collinear Antenna Project By W7lpn Rick Frazier.
By John Conklin WDØO. See older version here 3 element 7 dBd Gain. I decided it was time to set up a 2 Meter base station.
Ham Radio Projects By Csaba Yo5ofh High Gain Collinear Ais 162mhz Receiving Aerial Experimental Dual Band High Gain Flower Pot Antenna Ham Radio Antenna Ham Radio Dual Band 2 Meter Bobtail Beam Antenna Project 2 Meter Slim Jim Antenna Kb9vbr Antennas. 2M Collinear Antenna. WB3AYW WIRE COLLINEAR FOR 2 METERS.
This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago but it is a simple center-fed dipole. I used 1 thin-wall PVC pipe. This gain its not something exotic if the antenna compares with a 2 x 58 or a 3 x 58 Lamda Commercial antenna which it has about.
2 Meter 440 Vertical Collinear Antenna Project By W7lpn Rick Frazier. Get Images Library Photos and Pictures. Band VHF Dipole with Gamma.
Wire Antennas For Ham Radio Raynet Hf Technical Team Portable Antennas Collinear Antenna Col17 J Pole Antenna Wikipedia. This easy to build dual band VHFUHF antenna makes a great project for the new ham that is ready to get on the 2 meter and 70 centimeter amateur radio bands. Collinear antenna building by Karl Shoemaker.
Discussion in Antennas Feedlines Towers Rotors started by KJ4EKS Jul 23 2008. Thoughts On Vertical Coaxial Sleeve Dipole Driven Slim Jim Collinear Antenna Qrz Forums 144 Mhz Omnidirectional Horizontal Antennas Part 1 The First Amateur Lunar Tests Contacts 2nd Part 1966 1976 A Tree Friendly 2 Meter Halo Antenna Kr1st F23 Homebrew 144 Mhz Antenna Youtube. Gain for two collinear 12λ or shorter dipole elements peaks with 09λ wavelength spacing.
He is credited with original article in QST magazine. The goal here is to put up a cheap easy and quick 2-meter antenna that is simple and unobtrusive but works. 6dB colinear VHF antenna Building details of a VHF colinear antenna with 6 db gain 58 Collinear antenna A 58 wave stacked j-pole antenna plan 9 element yagi for 2.
A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 97 dBi gain and 18 Vertical Beamwidth. Band VHF Collinear with 2 Dipoles by SV1BSX This page is the second part of my VHF Collinear antenna project with matching-system for 2 dipoles model Gain 515 DBi. My question is if I were to have one dipole element facing the exact 180 degree opposite direction.
Homebrew 144 Mhz Coaxial Dipole Antenna In 2020 Dipole Antenna Ham Radio Ham Radio Antenna. It requires a balun and works very well. There are several methods of constructing a vertical dualband dipole and a simple method is.
On this collinear the length of Z1 is 136 m 1 Lamda electrical Lamda2 x 2 because the Lamda2 is not enough from Gamma match up. 1 shows the 2 dipoles with details about the coaxial cables. The space between the two dipoles is 15 m 075 wave length.
144 Mhz Wideband 5 Element Portable Antenna Pa144 5 1 5b. I am considering constructing a collinear antenna from Practical Antenna Design 140-150 mhz book. Bend a second right angle in the other direction 13 34 from the first right angle.
This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago but it is a simple center-fed dipole. With a 12λ dipole in each element the dipole center spacing below would be 09 - 25. 2 METER440 DUAL BAND SLEEVED DIPOLE MODIFICATION BY W7LPN Rick Frazier The photo above is of my balun modification of the QST August 2006 page 50 2 Meter440 dual bander sleeved dipole by Geoff Haines N1GY.
The original sleeved dipole project idea is from Harold Melton KV5R. Not open for further replies. A Simple 2m70cm Vertical Dipole Antenna.
This page is the first part of my VHF Collinear antenna project wich gives a gain of about 51 DBi with 2 dipoles and 81 DBi with 4 dipoles Omni directional. The wire that it would replace was already pretty good so its taken two years to decide to build it. I proceeded to make a very heavy dipole from copper pipe akin to the type used for J-poles.
The higher gain antennas have a lower vertical beamwidth. Radiation is caused by current and so areas of maximum current are where radiation primarily occurs. In a previous post we debunked the 2 meter 54 wave antenna as actually an end-fed full-wave antenna resulting in a poor radiation pattern hardly optimal for terrestrial use.
The project below is my own design for a dualband vertical dipole for 2 meters and 440. A dummy load or isotropiceven the venerable dipole has 21 dB gain over isotropic. Ost commercial 2-meter repeater antennas with gain fall into two categories.
Homebrew 144 Mhz Coaxial Dipole Antenna In 2020 Dipole Antenna Ham Radio Ham Radio Antenna. Portsof 50 9 broad-band hybrid junctions. I used 1 thin-wall PVC pipe aluminum tape and RG-8X coax.
I like to tinker so when I finish one project I go on to another even if it works well. Commercial antenna performance at a home-brew price. A collinear or co-linear antenna is an array of dipoles mounted in such a manner that every element of each antenna is in an extension with respect to its long axis of its counterparts in the other antennas in the array.
W7LPN 2m440 vertical dipole.
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