Phasing harness calculator. Note that the RG-59 center is just used as the gamma match.

Phasing harness calculator 1 x PL259 connection with 2 x 2. 38 284. In my case, with a different measurement of 0. Higher gain or a special shape radiation pattern is achieved. Co-phase harness used for connecting two antennas to one radio in a twin antenna setup. Increase gain by three decibels (3 dB) by doubling the number of antennas. This goes on all the way to the bottom. The following discussion about how to calculate the phasing lines took place in the Moon-Net reflector. An additional phasing harness could also be ordered to allow the dipole radiation pattern to tilt downwards by up to six degrees (6º) if needed. 5:1VSWR across the band. The simplest way to feed multiple bays is with a commercial power divider and equal-length 50-ohm feedlines from the power divider to each antenna. Keep in mind that stacking antennas and using a phasing harness will narrow the usable bandwidth a bit. How to build a phasing harness and direct link to their calculator. impedance ¼ wavelength phasing line for use in a circularly polarizing harness for ARROW class antennas mounted on the WRAPS rotator. There are calculators for figuring all of this out. That will present something close to a 50ohm impedance to your radio. Phasing Harness Calulator for 71 and 84 degrees; How big is the DX Commander box? Camdesk 1. 1/2 watt UHF radio on a 5000' Mountain can talk alot further than a 1/2 watt radio in a valley. I can not find any information whatsoever on these. As you know Quadrature line sections transform the Z of the antenna as presented to the main feed line and while the ‘Traditional’ Circular Phasing Harness works, I seemed to get better Symmetry by essentially ‘extending’ one leg of the 50 Ohm Tee Connector with a 50 Ohm Quadrature Section instead of possibly having Standing Waves on Feb 6, 2013 · The slower velocity makes the cables shorter and makes for a more compact phasing harness for any duplexer or phased combiner assembly. 66 for solid polyethylene type cables RG59, RG8, RG11 etc. I included Sep 1, 2004 · A phasing harness is necessary to provide the proper 50-ohm impedance to the transceiver and the proper phasing of the individual antenna elements. 7, 494, and 983. The same rule applies in that you will loose 3dB of gain in the linear polarity but talking to another circular polarity antenna you will gain 3dB over using a linear pol antenna. 1415926 'Calculate loop radius Deviations in the antenna and phasing harness dimensions can significantly skew the radiation patterns. Example: since the wavelength of the 1090MHz signal it is 275. Note that the RG-59 center is just used as the gamma match. Jan 5, 2013 · SY r=0. . Phasing Harness. The calculators, especially Dale Bickel's HAAT, Coordinate and Distance calculators are useful. 3dBD, each Big Wheel has a N-jack (female). By vertical stacking of two Big Wheels you get a gain of approx. STACKING, PHASING and MA TCHING YAGIS This is a synopsis of a talk presented to the Sydney VHF DX GROUP on Tuesday March 16th 1999 by Gordon McDonald VK2ZAB. Product is in These 2-Stack UHF Heavy-Duty Dipole Antennas consist of phasing harnesses and dipoles. The antenna has about 4Mhz bandwidth so the measurements are not extremely critical except for the phasing coils. Figure 3 shows how two individual 50-ohm antennas are connected together such that the signal is fed to both antennas in phase and the point where all antennas are combined is 50 ohms. I made a 4:1 coaxial balun to match the feed to the antenna. These rules can be found in the FCC's ET Docket No. I normally leave the antenna with stubs connected ( 10, 6 & 4m) to the phasing harness; the commercial centres uysed in the 2m version can be left wired and just the elements removed using the wing nuts. The 71-degree phasing line is 90 degrees at Mhz Cut the coax to the suggested length plus a few inches, in case your velocity factor is not quite right. The Phasing Harness. http://www. Co-phasing harness coax formula: Stacking Harness Feeding two 50 ohm antennas requires a harness to divide the power between the two antennas and also to maintain a 50 ohm system. 2. The antenna gain is approx. I found the subject so interesting that I decided to put together all the messages in this page. ). The FDC VHF Folded Dipoles are omnidirectional antennas equipped with a mounting boom and clamp. Here is the link to his website where Bill One thing to note is that for the phasing harness to work efficiently, there should be equal power distribution between the two antennas. com Phasing Harness. 5*cir/3. Having the connector already in place on the support makes it easier to assemble the phasing harness later. 2 dBi. Designed for stacking/baying YB820 series Yagi. One way to implement it is by using a power divider (any kind) and a set of cables with known length. Can someone please give me a clue here? The dipoles are mounted on a tubular boom made of high strength aluminum alloy, which offers a low resistance discharge path. This is not made complex at all. 73 Big Wheel antennas by WiMo are made of stainless aluminum, all other hardware is made of stainless steel. Circularly Polarized Yagi Antennas for Satellite Communications Aug 15, 2010 · Hi Edward. To connect two antennas to one coax feed a usual phasing harness can be used. 2 March 2008 an average gain in the lowest lobe of about 7. You should really use an antenna analyzer to tune the individual phasing harness sections if you use different coax than the original project or if you change the center frequency. It also provides supplemental information on velocity factors for different The bracket should be halfway up the pipe. Oct 29, 2020 · How to calculate it, and current forcing with examples below. To determine the length of the line, use this formula. The results were mediocre---the SWR is over 2:1, with a reactive component (to be expected) at 146MHz. It is important that the elements are connected as shown ( ie don't interchange braid and centre conductor). 3 feet; however, from my understanding, the DL6WU calculator should be used for long yagi antennas. Would building a bigger Yagi better suit May 4, 2012 · The Ultimate Guide to 11 Meter CB Antennas states correctly about the 90 degree phasing harness, however the choice of cable will make or break the operation. Check out my VHF dipole array project and the phasing harness shown there will work on a DB-224. Aug 14, 2009 · The individual elements are tuned using 50ohm coax and when the 75ohm harness is installed everything will fall into place. The Feedline. 5dBD. 4-Stack UHF Phasing Harnesses MT4/420C or MT4/460C. 8 and 468 with 95% end effect factor. The azimuth pattern is as close to cir-cular as is possible with fewer than four ele-ments. Dipole Calculator - folded; Dipole Calculator - straight; Bowtie • Batwing • Butterfly Dipole Calculator; Diamond Dipole Calculator; Elliptical Dipole Calculator; Fan Dipole Calculator; Monopoles J-Pole Antenna; Lambda/4 Groundplane Designerer; Short Marconi Antenna Designer; Sleeve Antenna Designer; HB9CV Antenna Calculator; Helix Antenna Phasing line calculation 1) Impedance : After calculation, the impedance of the phasing line section is 100 ohms. – How do we calculate this? • Reduced to a simple formula, Dopt (in wavelengths) is the number 57 divided by the 3db beam-width of a single antenna (in degrees) – What is Dopt for a 2m antenna with a 3db beam-width of 30 degrees? Jul 18, 2018 · Now we are back with a blogpost showing how we fixed ourselves a new phasing harness from scratch (almost). Specially designed center fed phasing harness of exposed dipole antennas ensures equal and in phase signal distribution to all the dipoles. Otherwise most of the Dec 1, 2021 · I forgot to mention some info on making a phasing harness for this type antenna. ( Phasing line section formula : Z0= √ (ZL x ZA) → √ (200x50) → √ 10000 = 100 Ω ) Therefore the phasing line section can be constructed with 50 ohm coaxial cable « RG-58 ». Co-Phasing Co-phasing or “stacking” has long been a way to get high gain from antennas. QUESTIONS When the stacking of Yagis is being considered, the questions which usually arise are: 1. This allows for achieving a higher gain or a specialised radiation pattern. "The phasing harness is made with an odd number of 1/4 wave-lengths of 75 Ohm coax to each antenna from the centre feed point (' T '), allowing for the velocity factor (vf) of the coax not just the free air wave length. 500Mhz exact center, 142 to 152Mhz bandwith less than 1. Support poles are not included and must be ordered separately. Aug 12, 2014 · In my opinion if somebody can make a harness friendly dipole it is lector. to navigate to use esc to dismiss. As with all radio services antenna systems can make or break a radio system. 2 meter balun for turnstile antenna Dual antennas use a co-phasing harness that has to be a specific length and impedance to get the 50 ohm match. 1 Download; How to Tune a monoband HF Vertical Quarter Wave Ham Radio Antenna; How to build a low-band (40m, 80m and 160m) antenna; How high should my dipole be? What is the report for the IOTA contest; Quarter Wave -vs- 5/8ths Wave Vertical Stacking Kit, for Two 2M HO LOOPs only, w/50 in. Scroll down on the link to find the pdf instructions. Use the best connectors and coax you have. The third and forth bays are crossed over again. You can use the Coaxial Length Calculator for any cable that is not shown in the table providing you know the velocity factor and loss per 100m at any frequency you wish to use. No 50ohm coax required. Oct 30, 2010 · Coaxial cables 1/4 wave long serve a variety of useful purposes in antenna assemblies. Information. Mar 31, 2021 · You would use a phasing harness with one leg 1/4 wavelength longer in coax plus velocity factor or use a high power divider with one coax 1/4 wavelength longer. + ? + shift + ? : N5DUX Oct 15, 2023 · In the main, we use phase lines to split power to more than one antenna. The effect in the H plane of phasing SMD antennas is fairly minimal, with only a slight reduction in the horizontal beamwidths (as shown for a single antenna) when up to four antennas are phased. I have 4 consecutive serial numbered boxes. Usually the center of the band is a good start. 5m leads also terminated in PL259 plugs. Jan 11, 2001 · Figure 17B shows the details of the phasing harness which is made from copper shield type RG-59/U. On the other hand, the phasing calculations provided in the harness datasheet are totally different. What are the reasons for stacking anyway? 2. Choose an option to suite your needs. " The sort of power splitters hams use for stacking Yagis are that sort. For making a phasing harness to match two 50 ohms antennas to a 50 ohm its already figured out. The first thing is measure the phasing harness for length before you start. When you are through with both pieces of coax, you now have a completed phasing harness tuned to the same frequency of your antennas. Doing Christman calculations by hand is covered in Chapter 7. You can use the Power Compensator to calculate dBW. Jan 29, 2020 · Looking to stack these 8 folded dipoles on my 100ft tower. PH and PHE Series phasing harnesses are used to feed multiple antennas from a single input. This calculator gives the lengths of the radiating element of a quarter wave (λ/4) ground plane monopole and the radials. Just enter any power in watts and the calculator will convert it to dBW. 93-62. References: 1. 8 inches (1. Dec 8, 2020 · A length of 75 ohm cable can be used to match some things to 50 ohms but it depends entirely on the impedance you want to transform. The Phasing Harness This is not done hard at all. 9+10 reports from Hartenbos and George. Try 142. Wednesday April 2025 Phone +44 (0) 7753225261; Subscribe. To do this, each leg of the harness needs to be 1/4λ (or odd multiple of a 1/4λ) long of 75 ohm coax. How to calculate the phasing lines. The ATA can be viewed as a "hybrid" between a standard turnstile and a QFH; it utilizes two varying length pairs of driven elements like a QFH, while keeping the construction simple like a As you know Quadrature line sections transform the Z of the antenna as presented to the main feed line and while the ‘Traditional’ Circular Phasing Harness works, I seemed to get better Symmetry by essentially ‘extending’ one leg of the 50 Ohm Tee Connector with a 50 Ohm Quadrature Section instead of possibly having Standing Waves on The first application shown in Figure 3 is one of the most common - a phasing harness for a 6M stacked beams. 09Mhz. On 27 November 1998 KC7YVZ wrote: Phasing Harness Calulator for 71 and 84 degrees All you need is the target frequency and velocity factor for this one. The Vertical stacking distance of stacked dipole antenna are factory adjusted for highest possible efficiency. Each of the runs is using 75 ohm coax, probably RG-59. Achieve higher gain or special-shaped radiation patterns. Stacking antennas can add about 3db of gain for each antenna added. This would be a coax jumper that is 1/4 wavelength long, taking into account velocity factor of the coax and any offset between the horizontal and vertical elements. When phasing SMD antennas, designers should first take into account the antenna to mast spacings. Phasing Harness, for Two Mono-Band Beam Antennas, works for 2m or 70cm bands, UHF Female Common to 2 Equal Length Coax Cables w/UHF Male, Each Part Number: DMN-SS770R 5. Usage . Cookie Policy; anti-spam; Delivery Information; Terms and conditions; This is the computation for the length of phasing harness required to any frequency computed from antenna center frequency that you are stacking . First, where does the 100 Ω impedance ¼ wavelength phasing line fit into the big picture? Figure 1 shows a pair of ARROWs set up for circular polarization operation. By selecting the right lengths of delay / phase lines, we can skew our energy toward May 17, 2014 · With that said, you can make a simple phasing harness from RG-59, RG-6 or RG-11 and I found using F type compression connectors and F type "T" adapters really simplifies the construction. 5:1. " Mar 4, 2024 · a stacking harness should be longer normally so i guess they misunderstood you on the phone and sent you the phasing harness for circular polarisation (and in fact you need two or three of them) phasing circular and stacking (ontop or side by side) are different things (in theory its the same thing . This impedance matching harness of coaxial cable construction, can be used in a large variety of applications 8. It is nothing more than a piece of 300 ohm twinlead that is electrically 1/4 wavelength in length. Unless you use a different antenna, or harness length, or There are a lot of variables involved. Clearly for use as a phasing harness it is not possible to place a 100 Ohm resistor on the outputs as the 6M beams need to be stacked at least 12 feet apart. Radiation Pattern: Dec 9, 2011 · You can build the complete phasing harness yourself for relatively low cost, if done correctly no combiner is required, the phasing harness is the combiner. Bluewave Marathon BME139FN1H0 138 - Jun 8, 2012 · If you think you might have regrets later about butchering up a good phasing harness, I would suggest just removing the whole harness intact, and use new line to the individual elements. My research is telling me that some AstroBeams came with twin RG59U 75-ohm cables at 6' long, wired in parallel, for an outcome of 35 ohms. I don’t know of a technique to measure coax line lengths using an SWR meter and 50 ohm load. If you change your mind later and want to restore it to it's original condition, you simply put the old harness back on. However, if using economy coax, your quoted VC may be off, so if that’s the case, you may want to measure a 90 degree test piece (that’s also shown in the calculations). RFI 850/900MHz Phasing Harness . 83 mm is needed (see screenshot). This build is based on the design by W4NFR. Phasing . Using the DL6WU calculator, it came out to be be 3. The middle part is where the 75 ohm connector connects to the phasing harness. The length of the RG-142 B/U coax between the cavities should be an electrical quarter wavelength, as should the length between the cavities and the T-connector. 9, 299. In the "4-bay dipole array project" link above, that project antenna is centered around 153MHz and its phasing harness calculations center it around the same frequency. 0:1 SWR on my radio and the radio's cut-back was working, so I switched on my auto-tuner to take care of the mismatch. 2-Stack VHF Phasing Harnesses 2-Stack VHF Phasing Harnesses couple two antennas together to feed in-phase, keep a low SWR and have minimum insertion loss. Also, select what radiation pattern desired. Lengths E and F are 63. A phasing harness is basically (2) sections of 75-ohm cable cut to odd quarter wavelengths X velocity factor, transitioning to a 50-ohm cable, which is usually the transmission line. 3; Phasing Harness Calulator for 71 and 84 degrees; How big is the DX Commander box? Camdesk 1. Phasing Harness Calulator for 71 and 84 degrees All you need is the target frequency and velocity factor for this one. If you have three or four stacked dipoles you must build a phasing harness – read the sentence above that is in bold again. So, we see that SW is right, we can use a random length for our harness, and we can even use 50 ohm coax, without a phasing harness, but we won't get a workable tune. However, in the case, I also have the original phasing harnesses, which seem in very good condition. Co-phasing involves placing two (or more!) identical antennas either side-by-side or one over top another (“stacking”) at a certain distance apart (usually a 1/2 Wavelength or more) and feeding the antennas in-phase. If we were going to put up stacked antennas, one must decide on what freq one will use to calculate on. This should leave the phasing harness transformer (color coded red) open for connection to the station transmission line. 78 the length is 15. These 4-Stack UHF Phasing Harnesses combine four antennas to ensure they are in sync, maintaining a low standing wave ratio (SWR) and minimal signal loss. 2mm, a difference of 1/2 of that (187mm) will put the signals in opposition of phase, canceling them. Feb 24, 2007 · This document provides instructions for building a stacking harness to combine two 50 ohm antennas. The radiation pattern can be changed in the field by use of common hand tools. Next, trim the coax by an inch, and repeat the steps above until the SWR dips at the same frequency as your antennas are resonant for. The branches of the harness are impedance-transforming sections and must not […] Apr 28, 2015 · How one type of phasing system works. 29 feet the 17. except a sharkfin. It explains that coaxial connectors and equal length phasing lines are needed, with the phasing lines being odd multiples of a quarter wavelength. Cutting the length will throw it all out of whack. Contact us for more details. (vf=0. Once the crossover has been completed, the next two phasing wires will go straight, connecting the second bay to the third bay. Masts, Hardware, Junction, Phasing Cables, Kit See More Specifications M2 Antennas HO LOOP Stacking Kits STACKKIT2M. Do this for both pieces of coax, which comprises the phasing harness. The normal turnstile antenna has a simpler construction than a QFH or a DCA, but also relies on a correct phasing harness and an impedance matching network. Nov 7, 2021 · However, I came across this picture: Various J-Poles types diagram indicating the phasing stub for a colinear 5/8λ antenna is a λ/4, is that right because I've had been modeling the antenna with a 3/8λ phasing stub? When modeling the λ/4 phasing stub as suggested by the diagram, the pure resistance drops to 72 ohms with the λ/4 stub, the Big Wheel antennas by WiMo are made of stainless aluminum, all other hardware is made of stainless steel. A quick Google search for Yagi phasing harness should yield a few answers. But you'd still want two feeds for this. The Phasing Harness . When consulting other forums and by using online phasing calculators, an extra length of -18. Dakota Digital Gauge Instrument Systems, AEM Engine Mar 24, 2021 · I've seen guys undertake a restoration on these antennas, only to complain about high SWR issues. Meanwhile a coax antenna in the harness is easy but still not as good as dipole. HF-Antenna. 9. It is absolutely nothing more that a piece of 300 ohm twinlead that is an electric 1/4 wavelength in length. Calculator Enter Frequency or wavelength of operation, Velocity factor % increase of radial length over the main vertical radiating element (0% means the radial length is the same as the monopole) Make sure both sides of bowtie are soldered together. RG-63/U (125 ohm) is easier to find but causes more of a mismatch when used with a 50 ohm main transmission line. The exact length of the cable is important as it's a matching Q section. Be sure to match the color codes. Feb 11, 2019 · You'll need to build a co-phasing harness which will require the following: [li] 2 antennas space 1 wave apart[/li] [li] 2 pieces of an odd quarter of 75 ohm coax (3/4 works if going with 1 wave of spacing)[/li] [li] a simple T connector[/li] Hook it all up, I'd use the lowest frequency you wish to use to figure your spacing out. 1 Download; How to Tune a monoband HF Vertical Quarter Wave Ham Radio Antenna; How to build a low-band (40m, 80m and 160m) antenna; How high should my dipole be? What is the report for the IOTA contest; Quarter Wave -vs- 5/8ths Wave Vertical Instructions are included below for building the antenna in an example for 147. split power and transform impedance) In the antenna datasheet, a mechanical offset of 200mm is specified. It will be fine for regular antenna feed line use if it is short, but I would trade it for LMR400 if I could. Modifying the Phasing Harness. Molded phasing harness cable joints and N-Female antenna termination connector ensures complete waterproofing and many years of maintenance free operation. I just dont cur You need 75 ohms on the harness to keep the system impedance at 50 ohms. The xls spread sheet comes with 2 program "sheets", each containing a different calculator program. Don't know if the bigger size or the impedance matching electronics in the lectro dipoles but no antenna comes even close. I apologise I couldnt go into more detail. Phasing harnesses are built with 1/4 wavelength multiples of feedline. 75 inches. The result is 3 db more than justRead More Stacking Distances Online Calculator using the DL6WU formula - including background infos Preview Phasing & Matching Lines How to measure coax stub lines, produce coaxial impedance transformation lines, Baluns and how to stack and match with coax lines Since the stacking height between the antennas is 12. May 31, 2022 · Well to be honest that isn't a large price. 31 foot long phasing line will reach between the two dipoles. Pre-made harnesses available, no "T" required, easy peasy. This example was first described by Richard Lax, G4AHN, in issue #23 of SIX NEWS. Jan 21, 2024 · Typically you would harness them together with a phasing harness. The Christman calculator will get you quite close to the proper length of coax for the feedlines and phasing line (assuming you know the velocity factor of the coax cable), but for fine-tuning I don’t think SWR is a suitable parameter — the line lengths are best cut for minimum Z I used RG58 and a good quality 75 Ohm TV line for the phasing harness and still received 5. and 18 in. Apr 8, 2022 · Calculating the 1/4-wave (90º) frequency of a coaxial cable of known length. 0 out of 5 stars ( 1 ) Apr 4, 2021 · So stacking on the Stacking distance E plane in inches, looks like my distance between the Yagi antennas would be roughly 3 feet, center to center. A phasing harness is a device which combines a set of antennas with a certain phase relationship. Co-Phase Harness. These antennas deliver exceptional performance, with a nominal gain of 2 dBd and an impressive VSWR of less than 1. So, I decided to try one out. Previously, I've constructed custom harnesses for ham use and they worked well. Jan 16, 2021 · Rough and ready video showing how to calculate the length of a specific electrical length of coax. Whether it is the phase delay line for a Turnstile Antenna like the 80 meter Turnstile Antenna or to make the feed lines for a four-square antenna, the transformer action of a 90 degree long feed line serves many purposes. Please note: Antennas must be at least 8 feet apart and radiation pattern will be affected. This is likely the result of them not having a phasing harness. The phasing harness I used consists of 6 pieces of RG-59 coax. Make all connections snug but do not apply heavy force with pliers. Keyboard Shortcuts. Key Features . The Feedline Frequency response 146. Notice the resultant wavelengths. A phasing harness is needed if two or more Quagi antennas are stacked for additional gain. Jan 11, 2021 · Short overview of the main components of the Christman Phasing System. Each piece of coax needs to be an odd multiple of a quarter wavelength for the frequency you built the antenna for May 9, 2017 · Phasing harness solutions for optimal wireless communication coverage and capacity. Lengths A, B, C, and D are 40. Feed the dipole with 50 ohm coax unless you are building a phasing harness for multiple dipoles (detail of the harness is not given here but it is a common "odd quarter wave" matching harness). RG-133/U (95 ohm) is the best to use for the harness. Jun 17, 2005 · "A phasing harness however, based on my understanding, consists of various coaxial lengths with varying impedances, thus it seems to be different to a power splitter. net May 5, 2024 · Then the phasing harnesses are very critical in the manner of construction having to follow the root of the sum of the squares, then the fact that there will be 5 T connection up in the air as part of the phasing system, and no matter how good the connections are these will be subject to the weather and temperature extremes. ctrl + shift. The FDC four stack arrays use center-fed, broadband, half-wave antennas supplied with a mounting boom and clamp. The lengths of the coax harness must be long enough to reach each antenna per that spacing. sciencewriter. Amateur Radio operators licensed by the Federal Communications Commission of the United States of America are required to do a "routine evaluation" of the strength of the RF fields around their stations, subject to certain exemptions. 04 meters) long from the dipole feed to the center of the T. In our case the mission is quite simple. I have installed ones that cost many times more than that in commercial applications. Edited October 23, 2015 by RadoStefanov Things to notice: try frequencies 149. Any thoughts if I am correct in my research Feb 16, 2025 · Build a Phasing Harness For Stacking Antennas By Mike Thompson WB8ERJ (Off-site link - opens in a new browser tab) Mike needed to make a phasing harness for a two bay antenna, where each antenna was 100 ohms. The 2-meter Jan 29, 2022 · You will need a 75ohm phasing harness (RG59 works fine) to connect your Wilsons in a phased array. Description FDC 4-Stack Dipole Arrays. In my situation, with a rate variable of 0. A calculator can be found on the N5XU web site. Since we are dealing with coax cable these calculations need to include the velocity factor to Apr 8, 2005 · This setup showed >2. If you use other cable than RG58 and 75 Ohm TV line then you have to re-calculate the length of cables as the velocity factor of cable differ. 5 with no velocity factor. The Christman feed system is well known as using a pair of 84 and one 71 degree line connected together to achieve a 90 degree phase shift with a pair of 1/4 wave ground mounted verticals spaced 1/4 wavelength apart. Sep 8, 2018 · The phasing basically requires two cables exactly identical in length and same material. This means the you really need to make an effort to reduce the SWR down to 1. In this case, it is the 155º line used in Christman phasing schemes where the relay switching box is replaced with a Tee connector fixing the array’s directivity. 2:1 or so on each antenna to make a real difference. Using the DB212-4 phasing harness, connect the two completed DB212-2 units together (see Figure 9). Leaving one end of the coax open, set your RF analyzer to Mhz and trim the coax until you see minimum Z impedance (alternatively, you can also look for minimum X reactance). 2) Length ( VHF Eggbeater ) : 2-Stack UHF Phasing Harnesses Two-Stack UHF Phasing Harnesses harnesses are used to couple two antennas together so they are fed in phase, keeping a low SWR and minimum insertion loss. 62 meters) long from T center to T center. COAX PHASING calculator. yvqrwta waveu fbqa tgvgvtr wtwf fuqq ioqkswy pilaoqu axibuh dgft tvayv tilcvo hev ukb slpwn