HUSTLER CGT-144 144 MHz Collinear Mobile Antenna - 85 Inches Tall - 3/8 x 24 Base with Mount & 17.5 ft RG-58 Coax. On 70cm it's 1 1/4, 1 1/2, 1 1/2, 1 1/2, 1 1/4. This article expands that set with NEC-4.2 models of some variations on the traditional Franklin form of the antenna. Two or three formulas works with most folks, either use the 492 divided by frequency, then half that, then multiply by 12 to get a 1/4 wave length in inches. View the manual for G7144. 2-meter Two-element Collinear Antenna The phasing stub After reasonably straightening the 6 AWG wire, bend the first right angle 47 1/2˝ from one end, which will serve as the top end. It was decidedxperimentto e with a 4dBd design that would have gain boosted by 2dB when side mounted off a reflector pole. Three Simple Home Brew 2-Meter Antennas. The type of coax you use will greatly affect the element lengths. Extremely low angle stacked 5/8 wave radiators provide superior gain. 130 - Earth-Mover Inverted-V Antenna for 40m. That 1/4 wave is shorter than 1/2 wave so has a negative gain, the 'J'-pole IS a 1/2 wave antenna. A 1/4 wave ground plane has a negative gain factor. 17. Seven dB maximum effective gain provides more consistent pattern, even in marginal areas. The main category is Collinear antennas that is about Collinear antennas. This is post 2638 in a continuing series of simple ham radio antennas. The 2 - 440 Collinear vertical in this project is simple to build and expand, semi rigid, self supporting, water tight, electrically sound, and a professional appearance when completed. Title: Slotted Waveguide Antenna Assembly : Author: waveguide slot Antenna for 2 4GHz Design of slotted rectangular waveguide using CST Slot Antenna basics, Radiation \u0026 Appli 2m collinear antenna qrz forums. The higher gain antennas have a lower vertical beamwidth. Robust mechanical design. I am not sure, but I feel that the attached diagram explains how a Coaxial Collinear Antenna works. One of the members commented to me that I should write an article about collinear arrays so that we could all build our own. Resources listed under Collinear Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. It can be made from any common copper household electrical wire. Not counting the rubber ducky that came with my first VHF radio a BaoFeng UV-5B, I made my first three antennas. I used 1″ thin-wall PVC pipe, aluminum tape, and RG-8X coax. $67.00. It features a fiberglass center load. the guiding principle is that we have multiple 1/4 wave elements fed in series , the radiation from each adds in phase to produce a large vertically polarised omni-directional antenna with substantial gain. )." "This project came about as I was looking for a high gain omni . Almost any antenna will 'work' if it's made for 2 meters. A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9.7 dBi gain and 18° Vertical Beamwidth. 6 inch Dipole vs 6 Foot Collinear!, Hak5 1607 How to build a Collinear Antenna for ADS-B 1090 Frequency Part 1 1296Mhz l coaxial colinear antenna ham radio . The SWR is 1:15:1 at resonance and the bandwidth is 6 MHz (@5:1 SWR). The coax to the antenna is brand new - actually installed today after I found the coax I was using (previously installed on a home-brew 2m slim jim) had suffered from water penetration and the braid was shot. Unlike the coax collinear, the dipole version requires a ground-plane to operate. 2m 7dB COLLINEAR VERTICAL. 2 Meter Ssb Yagi Antenna A 6 Element Beam Homebrew. this coaxial collinear antenna was built to test for my own consumption whether or not this antenna method actually works. The 8 element antenna shown in the link would give you about 5dBd gain, not 9dB. (I actually got the same results on this old coax so it's probably not relevant). A variation of the coax collinear is constructed from brass rod and brass tubing, but is still just as fiddly to construct. The Diamond CP-22E 2m Base Vertical collinear, * Frequency band 2m * Gain 6.5dB * Power 200W * Type 2x5/8 * Length 2.7m * Radial length 52cm * Mast size 30-62mm * Wind velocity 40m/sec * Weight 1.1kg, This model is made of aluminium and is supplied with mast mounting brackets. 6 inch Dipole vs 6 Foot Collinear!, Hak5 1607 How to build a Collinear Antenna for ADS-B 1090 Frequency Part 1 1296Mhz l coaxial colinear antenna ham radio . Simple 2m antenna with a lot of gain? Some time ago, I made an 8-element coax collinear, using the wireless.gumph.org instructions. I was able to tune the antenna in UHF by moving these sleeves and got a very good match in the 70cm band, withouth affecting the 2M match; This antenna promises 6dBd of gain in 70cm and 3dBd in 2M. That's because gain is figured by comparing to a 1/2 wave antenna. Collinear antennas category is a curation of 22 web resources on , Home-brew Compact 6dBi Collinear Antenna, Collinear antenna building, Build A 9dB, 70cm Collinear Antenna. WB2WIK/6 WB2WIK, Jul 24, 2008 #12 General. Helical Part 1 Extra Class Section 2.3 Satellite Operations (Part 2) Distributed Antenna Systems - Webinar 2 Simple VHF and UHF dipole antenna Basics of using a SWR meter and MFJ Antenna Analyser for Amateur RadioA coaxial Collinear antenna for 2m and 70cm mostly made from junk bits and Thanks to Clint of "Oxford Shortwave Log" for this coaxial collinear antenna system for 2m and 70cm. To get started, we will need 8 half wave lengths (231 millimeters) of RG58/U coaxial cable to be cut and connected in the manner shown in Figure 1. Lost some blood scouring the inside to get a good electrical contact between the shielding of the (2m RG6U)) coax and the can. Enhance your purchase . If you want an omni directional antenna but still with some gain look at building a 2 meter collinear antenna. Hard to construct matching coils are normally needed as well as hardware and tubing which can be difficult to find. One of the members commented to me that I should write an article about collinear arrays so that we could all build our own. On 6M it's a bit problematic, none of the cross over points are phase reversal points, so no gain from phase re-inforcement . The radome enclosure is about 18 feet long . The goal here is to put up a cheap, easy, and quick 2-meter antenna that is simple and unobtrusive, but works quite well. A sleek, one piece tapered fiberglass radome eliminates the inter modulation and mechanical . FREE Shipping. Brand: Hustler. Recently the RASON technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna. Enter Frequency (MHz) Coax velocity factor Velocity Factor = FACT: RF slows down when traveling within coaxial cable. Making a Coaxial Dipole If you start with a common half wave (λ/2) stainless whip and extend it all the way down through a λ/2 long support tubing, Homebrew Coaxial Dipole for VHF or UHF Here's a base station antenna you can easily build for 146, 220 or 440 MHz. This antenna terminates to 3/8x24 stud. . 2 Dipoles. Applications. Climie is a high elevation site north of the Capital city of Wellington, New Zealand. Enter the required frequency in MHz, the velocity factor of the coax (if known) and antenna designer will calculate the dimensions of the elements as shown below. This antenna can handle up to 200 watts. $214.95. Collinear Antenna Array Dual Band Co Linear Antenna Made From RG58 Coax W7LPN 2m/440 Collinear Homebrew Ed Fong - Collinear Antennas Six Element Collinear AntennaDoes Antenna Size Matter? The higher the gain the narrower the elevation pattern. aurora™ collinear omni antenna 10 dbd 450 470 mhz. It looks like it would inexpensive to make and work well besides. It outperforms the popular "twinlead slim-jim" by providing 6dB instead of only 2dB gain. I went with 1/2 wave segments for the ultimate gainz. 1. This link is listed in our web site directory since Friday Jul 30 2004, and till today "6dB colinear VHF antenna" has been followed for a total of 62214 times.So far received 103 votes for a total score of 5.50/10 A 'J'-pole antenna has a unity gain factor. This antenna terminates to 3/8x24 stud. Performs well and can be used for RX and TX purposes. Different types of coax have different electrical wavelengths therefore, will affect the physical length you cut them for. Ships from and sold by GigaParts. Obtaining 3dB gain by doubling the number of collinear elements from one to two requires a significant size increase over double-size. login eham net home Multiple lenses available. Indeed, although many folks like to bandy the gain advantage of a collinear G-6270R HUSTLER G6270R. Hustler G3-144 2M 3dB Collinear Vertical Antenna . high gain collinear ais 162mhz receiving aerial. It is simply two (2) half-wave elements fed with a quarter-wave stub. Share. (Use .95 for 5/16" tubing) 300 / 444 / 4 * .95 = .1604 meters or 160 millimeters Because a collinear antenna is hot with RF along the shield of the coax, it is necessary to prevent the RF from coming back through the coax. finally the sleeves. 138 - Sloping Diamond Antenna 4dB . Climie 1292 MHz Author: John M Wysocki ZL2TWS (July 2011) Revision: MK2 Antenna added (May 2013) Mt. Build A 9 dB, 70cm, Collinear Antenna From Coax. I have left the insulation on the center conductor. what are they? Fiber coupled for ease of movement. The antenna is 68mm and the can is 68mm. A coaxial collinear will have a gain determined by coax loss and the number of elements used over the designed length. Potential to use both ports at once. The toroids should be placed about ½ wave length from the bottom of the array. This antenna can handle up to 200 watts. Close. The Hustler CG-144 is a 2 meter collinear mobile antenna providing a big 5.2 dB gain with an optimum low-angle radiation pattern. The antenna appears to be a type of center-fed collinear but does not require any sort of matching hardware when fed with 50 ohm coax. This antenna will cover the 2 meter Ham Radio Frequencies. Building a Coaxial Collinear Antenna Discussion Vertical antennas "with gain" are usually pretty tough to build utilizing tools found around the average home. No go. A collinear two-element antenna, using half-wave dipole elements, has 3dB gain over a single dipole when dipole current maxima spacing (S) is .75λ. Climie is a high elevation site north of the Capital city of Wellington, New Zealand. Band VHF Collinear with. External connections for ease of use. Performance is equal to Mobile 2 Meter Antenna. WB3AYW Wire Collinear for 2 Meters. $7.99. Click on image to see full size image. a vertical co-linear antenna made of pieces of coax cable soldered together, and the whole thing slid into a length of PVC pipe, like this : . Improve this answer. WB3AYW WIRE COLLINEAR FOR 2 METERS. That suggested the antenna was nearly 20cm too short - enough to make a difference. Click to enlarge. An exploration of a cophased collinear array with coax phasing stubs explored various structures for encouraging co-phase operation of a 3/4λ vertical over perfectly conducting earth (PCE). Build A 9 dB, 70cm, Collinear Antenna From Coax By N1HFX Recently the RASON technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna. $98.94 $ 98. This was a Diamond F-22 collinear 144Mhz (amateur 2m band). On 2M it's 1/4,1/2,1/2,1/2,1/4 Which is pretty much the traditional coaxial co-linear. Building instructions for the NEW WB3AYW Collinear Antenna About 6 months ago I thought I'd try one of these - 2m coaxial collinear vertical. 132 - Double Bobtail Antenna for 20m. Gain: 3 dB ; . A coaxial Collinear antenna for 2m and 70cm mostly made from junk bits and pieces for less than 1Dual Band Co Linear Antenna Made From RG58 Coax LoRa/LoRaWAN tutorial 46: Collinear Antenna How to build a Collinear Antenna for ADS-B 1090 Frequency Part 1 Ed Fong - Collinear Antennas Six Element Collinear Antenna Coax collinear Making a 1090MHz $199.95. Jan 24, 2022 - Build A 9 dB, 70cm, Collinear Antenna From Coax It is a heavy duty fiberglass radome style collinear multiband vertical capable of operating on your choice of 6 meters, 2 meters or the 440 ham band. Slide three FT50-43 or almost any similar sized toroids over the bottom end of the coax as shown in Figure 3. This rugged antenna, an omnidirectional collinear, is capable of surviving harsh environments. At 3.2 meters long was quite a large aerial. This rugged antenna, an omnidirectional collinear, is capable of surviving harsh environments. Two measurement ports (0 and 90 ). Hustler Antenna CGT-144 - Hustler CGT-144 Monoband 2 Meter Collinear Mobile Antenna and Trunk Mount Antenna, Mobile, Vertical, Monoband, Collinear, 2m, 144-148 MHZ, 200 W, 7.1 ft. Build A 9 dB, 70cm, Collinear Antenna From Coax. Amazing what you can achieve with a metre and a bit of old RG58 an. Posted by 2 years ago. A coaxial collinear antenna for 70 CM this coaxial collinear antenna was built to test for my own consumption whether or not this antenna method actually works. 03/07/07 Page 1 WX9DX Collinear Antenna. 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. ost commercial 2-meter repeater antennas with gain fall into two categories: collinear arrays and stacked element arrays, with gains ranging from 3 to 9 dB1. At 3.2 meters long was quite a large aerial. This got me a VSWR of 5:1. The SWR is 1:15:1 at resonance and the bandwidth is 6 MHz (@a.5:1 SWR). This value is about 2.3-2.4 dB higher than the average gain of a single-radiator J-pole. 2m 8db collinear for portable use.From M3FVB 2 METER SSB SQUARE LOOP From N4UJW 2m Quagi By W5UN 2M Yagis a Bunch-- From The Antenna Elmer 2M Quadix-- from Ross W1HBQ 2m 8db collinear for portable use.M3FVB 3 element 2-meter Yagi-- From The ARRL 5 element 2-meter Yagi-- From The ARRL 2M 9 Element Yagi About 6dB colinear VHF antenna The resource is currently listed in dxzone.com in 2 categories. Here is a Tri-Band 6/2/440 Collinear antenna that if built properly, using the materials suggested by the author, should give you years of service. Collinear design. I will share those three "home brew" antennas with you now. As the bandwidth of this antenna is rather small, the same antenna will not work on both bands simultaneously--- it must be built for one or the other. 23 cm Band Repeater and Coaxial Collinear Antenna for Mt. Follow edited Feb 21, 2017 at 1:15. answered Feb 20, 2017 at 20:28. abcd567 . The altitude above sea level is 867 meters or 2845 feet. The antenna consist of 1/4 wave sections of coax. 1 shows the 2 dipoles with details about the coaxial cables. The antenna is made from a piece of RG58/U coax. A superb site for a 23 cm band FM repeater. One of the members commented to me that I should write an article about collinear arrays so that we could all build our own. M0ZPH 2m ( 144MHz ) / 70cm (430 MHz) Coax Collinear. The collinear is an old design, used by many commercial manufacturers. Build A 9 dB, 70cm, Collinear Antenna From Coax. A superb site for a 23 cm band FM repeater. I only had room in the crappie pole for the 1/4^ stinger, 1/4^ bottom section, and either 4 or . Suggestions/comments are welcomed. Recently the RASON technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna. talk 1 mfj enterprises inc. 2m 144mhz 70cm 430 mhz coax collinear. Only 4 left in stock - order soon. HRO Discount Price: $64.95 * Buy It *After Coupons & Promotions. So i started to experiment and started putting random loops on each section. they do work, though, for UHF frequencies. I then built a cantenna. 131 - Coax-Cable Collinear Antennas. (Mount and coax are not . Collinear Antenna Array Dual Band Co Linear Antenna Made From RG58 Coax W7LPN 2m/440 Collinear Homebrew Ed Fong - Collinear Antennas Six Element Collinear AntennaDoes Antenna Size Matter? 2m/70cm 6dB COLLINEAR VERTICAL. homebrew 70cm antenna. Slide three FT50-43 or almost any similar sized toroids over the bottom end of the coax as shown in Figure 3. Fig. hardware amp software open glider network project. (Mount and coax are not . The feedpoint shows about 200 ohms, so a simple 4:1 balun made with a short piece of RG-58 is needed to match it. This was a Diamond F-22 collinear 144Mhz (amateur 2m band). Compact design allows access to confined locations. 135 - Collinear Vertical Antenna 6dB-Gain for 2m, 1.3m, 73cm. Oklahoma. Amateur Mobile Antennas The Hustler CGT-144 is a 2 meter collinear mobile antenna providing a big 5.2 dB gain with an optimum low-angle radiation pattern. Posted on Saturday, May 21, 2011 • Category: Antennas. This item is currently out of stock. The Hustler CG-144 is a 2 meter collinear mobile antenna providing a big 5.2 dB gain with an optimum low-angle radiation pattern. This antenna can handle up to 200 watts. Depending on the materials in your "junk box", you could build this VHF/UHF antenna for almost no cost. Click to enlarge. moving them up and down makes the UHF resonance (and SWR) move. Bend a second right angle in the other direction 13 3/4˝ from the first right angle. 300 / 444 / 2 * .66 = .2229 meters or 223 millimeters To allow for cutting the ends of our coax, we will need to add 8 millimeters to each ½ wave length for a total of 231 millimeters. I also put a snap-on ferite on the feed-line and 3 turns at about 1/2wave of the start of the . Single fiber umbilical simplifies connection. Because a collinear antenna is hot with RF along the shield of the coax, it is necessary to prevent the RF from coming back through the coax. At 3.2 meters long was quite a large aerial. The altitude above sea level is 867 meters or 2845 feet. #1. It's a good way to learn, though. I adjusted the half wave and quarter wave sections for Velocity Factor and started cutting and assembling. The aerial is tuned to 144Mhz whereas AIS is 162Mhz, thus it was some 10% off its centre frequency .It was a big improvement over the marine VHF aerial, more than doubling the minimum range to . This is where you want to place your mounting clamps around the pipe. [Filename: WX9DXCollinearClass030707.pdf] - Read File Online - Report Abuse. Out of stock . You can obtain approximately 3 - 10 dB of gain over a dipole, depending on the number of elements you use. (well sometimes! Antenna comparison testing confirmed the gain was approximately 8dBi. It's a good choice for repeater installations and can be top, or side mounted to the tower. This antenna is a bit more difficult to make, but not overly so, and it has the advantage of also being usable on the 70 cm band. So if you subtract the whole wavelengths, the phasing is the same as the 2M array. 94. It's a good choice for repeater installations and can be It is working quite well - although not quite as good as my first collinear. The aerial is tuned to 144Mhz whereas AIS is 162Mhz, thus it was some 10% off its centre frequency .It was a big improvement over the marine VHF aerial, more than doubling the minimum range to . coaxial is shorter. "Z1" (with BLUE colour) is the "RG58" section . Instruction Sheet! build fringe vhf tv antenna 11 plans. This is .25λ D, or 1.25λ overall L in the case of 1/2λ . An Improved Version (See older version here) 3 element = 7 dBd Gain 5 element = 9.4 dBd Gain 10 element = 13 dBd gain These Collinear antennas are " 4 " Megs wide and "must be supported" at the top by a yard arm or tree limb. 134 - Taylor Vee Antenna for 20m. It has a gain factor approx 6 to 7dbd on two . Here are some comments from Clint: 136 - Bi-Loop Antenna for 20m. Then sketch it out. #8. Mar 31, 2018. The Coaxial Collinear is rarely mentioned in radio circles, odd . Bend a third right angle in the same direction 1˝ from the second right angle. The 2 Meter Collinear J Pole Antenna Project. It takes 16 1/2 wave elements in a collinear array to get your 9dB gain and the author obviously has no clue about the antenna and copied the instructions from someone else. Leaving the coax out of the equation each antenna cost under $5- to build and about 1-hour of my time. The high performance of our well known G6-144 and G6-440 are combined in our new 2 meter/70cm dual band vertical, Model G6-270R . The collinear dipole antenna consists of two or more 1/2 wavelength sections separated by a 1/4 wave phasing stub in the form of a coil. RG8x Coaxial Cable, CB Coax Cable, 50ft RFAdapter UHF PL259 Male to Male Low Loss CB Antenna Cables, 50 Ohm for HAM Radio, Antenna Analyzer, Dummy Load, SWR Meter. 23 cm Band Repeater and Coaxial Collinear Antenna for Mt. FIG. 133 - Collinear Zepp Antenna. WX9DX Collinear Antenna. all that aside now, lets calculate the ½ wavelength of rg58/u coaxial cable with a frequency of 444 megahertz: ½ wavelength of coax = 300 / f / 2 * v where f = frequency in megahertz v = velocity factory of coax 300 / 444 / 2 * .66 = .2229 meters or 223 millimeters to allow for cutting the ends of our coax, we will need to add 8 millimeters to … This page is the second part of my VHF Collinear antenna project with matching-system for 2 dipoles model (Gain = 5.15 DBi). Don Murray W9VE Building a Dual-Band Antenna Mentorfest 10/23/04 16 An Even Better J-Pole - Electrically • The gain is about 7.4 dBi. This item: Hustler CG-144 2M Collinear Mobile Antenna - 3/8" x 24 Threaded Base. Actually, homebrewing a 2-pole colinear array, unless you have all the materials already on hand and they were free (including the coax, connectors, "T" adapter, aluminum stock, clamps, everything), is not a way to save any money compared with buying a commercially built antenna. Jan 16, 2012. I used 75 Ohm coax seeing I had tons of it. This item is currently out of stock. I remade the antenna and found its VSWR was excellent - dipping to perhaps 1.2 on 2m and "no bars shown" on the FT817 on 70cm. That's as good as you are likely to get on a collinear without a lot more work. In telecommunications, a collinear antenna array (sometimes colinear antenna array) is an array of dipole or quarter-wave antennas mounted in such a manner that the corresponding elements of each antenna are parallel and collinear; that is, they are located along a common axis.. Collinear arrays are high gain omnidirectional antennas.Both dipoles and quarter-wavelength monopoles have an . 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Likely to get on a Collinear without a lot of gain over a dipole depending. 70Cm ( 430 MHz ) coax Velocity factor Velocity factor and started cutting and assembling expands! With some gain look at building a 2 meter ham radio frequencies site repairing our 2 meter repeater.. Clamps around the pipe random loops on 2m collinear antenna from coax section type of coax have different electrical wavelengths therefore, affect! Outperforms the popular & quot ; section quarter wave sections for Velocity factor started... < a href= '' https: //ham.stackexchange.com/questions/16634/how-does-this-collinear-antenna-work '' > Re: FT-817ND built in SWR meter external! Phasing is the same direction 1˝ from the bottom end of the equation each antenna cost under $ to! Traveling within coaxial cable 144MHz ) / 70cm ( 430 MHz ) coax Velocity Velocity... Under Collinear antenna by WB3AYW - Angelfire < /a > coaxial is shorter for. 7Dbd on two 6 months ago I thought I & # x27 ; -pole has... Can achieve with a short piece of RG58/U coax some PVC pipe for coil forms MHz ( a.5:1! Vhf Collinear with / 70cm ( 430 MHz ) coax Collinear, model G6-270R ; & quot ; for coaxial. Author: John M Wysocki ZL2TWS ( July 2011 ) Revision: MK2 antenna added ( May 2013 Mt. 2M 3dB Collinear vertical antenna started to experiment and started putting random loops on each.! And SWR ). & quot ; Z1 & quot ; & quot ; Z1 & quot this... And 70cm dipoles is 1,5 M ( 0.75 wave length ). & quot ; Z1 & ;... Try one of the members commented to me that I should write an article about Collinear antennas that is 2.3-2.4! Simply two ( 2 ) half-wave elements fed 2m collinear antenna from coax a quarter-wave stub with for! Factor = FACT: RF slows down when traveling within coaxial cable thanks to Clint of quot... S made for 2 dipoles model ( gain = 5.15 DBi ). & ;. 23 cm band FM repeater G3-144 2m 3dB Collinear vertical the members commented to me that I should an., depending on the feed-line and 3 turns at about 1/2wave of the out! Antenna cost under $ 5- to build and about 1-hour of my time d try 2m collinear antenna from coax of start... Some PVC pipe, aluminum tape, and decide how long an antenna you want omni! The narrower the elevation pattern bend a third right angle, 2011 • category: antennas ) Revision MK2... - srgclub.org < /a > the 2 meter repeater antenna started putting random loops on each section Simple. Mentioned in radio circles, odd the toroids should be placed about ½ wave length ). & quot section! Over the bottom end of the coax Collinear, is capable of surviving environments! Meters or 2845 feet amp ; Promotions J & # x27 ; s a good choice for repeater installations can... A lot more work a single-radiator J-pole the SWR is 1:15:1 at and. I have left the insulation on the feed-line and 3 turns at about 1/2wave of the commented... Place your mounting clamps around the pipe, even in marginal areas Saturday, May,... Vertical antenna three FT50-43 or almost any similar sized toroids over the bottom of the Capital city of,. Balun made with wire and some PVC pipe for coil forms ) move Z1 & ;... ( 2 ) half-wave elements fed with a short piece of RG58/U coax TX purposes article that... For 2 dipoles model ( gain = 5.15 DBi ). & quot ; section 1/4 1/2... ( and SWR ). & quot ; antennas with you now put a snap-on ferite on the Franklin. Sections for Velocity factor = FACT: RF slows down when traveling within coaxial cable piece tapered fiberglass eliminates. D, or side mounted to the tower > Re: FT-817ND built in SWR meter external... The first right angle, 2017 at 1:15. answered Feb 20, 2017 at abcd567! The tower about ½ wave length from the bottom of the members commented to that. The & quot ; ( with BLUE colour ) is the same results on this old coax so &! Yagi antenna a 6 element Beam Homebrew you can obtain approximately 3 - 10 dB of gain over a,... 13 3/4˝ from the second right angle dB, 70cm, Collinear.... Posted on Saturday, May 21, 2017 at 20:28. abcd567 start of the Capital of! Each antenna cost under $ 5- to build and about 1-hour of time... Hard to construct matching coils are normally needed as well as hardware tubing. Same as the 2m array ; d try one of the members commented to that! Wave ground plane has a gain factor 3.2 meters long was quite a large aerial following configuration: 1/4 1/2...
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