Kincaid, WD8OYG Merge a modern microprocessor with the time-proven L network and what do you get? The AT-11 antenna tuner. It provides superb current balance, very wide matching range (12-2000 Ohms) and continuous 1. And I’m going to keep this VERY simple. You have by now realized that this is about the cheapest and easier to build antenna!. The popular among them are stub or Q-section of length equal to λ/4. BUILD AN HF ANTENNA TUNER MAKE A HOMEBREW HF-VHF ANTENNA TUNER (It really isn't all that difficult. But in all application you need to "adjust" for optimum performance. On 20 meters the antenna will be too short and thus capacitive. A Single Control Remote Antenna Tuner This antenna tuner uses a single motor drive to make remote operation easier. I captured a video of the tuner in operation, as viewed on the monitor inside the shack. Kevin Loughin (KB9RLW) shows us how to use locally available materials to design, build, and use this useful tool for antenna designers. The L-Network Tuner was chosen to give a simple and efficient solution with the bonus ability to switch the capacitance to the input or output given a low or high Z load. Checkout Eham. Tuning the DXE-VMN-1 Vertical Antenna Matching Network is straightforward and intuitive. thanks guys. Find helpful customer reviews and review ratings for Zerone 1-30 Mhz Manual Antenna Tuner kit for HAM RADIO QRP DIY Kit at Amazon. But the SPC seems to go down to 160 more easily than an L network with the same C1 and L as this tuner (the big one at least) uses. Here are examples of how these goals can be accomplished, using either a military surplus L-C tuner or a commercially manufactured unit, along with an antenna analyzer that measures system performance, including load resistance and impedance, the standing wave ratio, and the net reactance at a particular frequency. Ideally we want to use the lowest amount of inductance required as the windings on the toroid are more lossy than the capacitors. Although the auto-tuner provides the ham with a more versatile device as well as protecting the rig’s components, the antenna is more vulnerable than ever. Although the built in KX3 tuner handles all the matching now, I'll describe the tuner I needed to use with my previous rigs in case anyone is still interested in a homebrew external tuner. A 100-watt Compact Z-Match Antenna Tuner By Phil Salas AD5X I've been reading about Z-Match antenna tuners for quite awhile now. If I had to do it over again, I would build it. 9 turns per inch. The wire can be wrapped up small and the whole thing fit into quite a small space. It seems that pressing the TUNE button on. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). The conventional wisdom is one can more effectively and efficiently match these big sticks at the feed point with a remotely located matchbox/antenna tuner. 80m Inverted-L Antenna (Base-loaded for 160m) Click here to jump to latest news on this antenna My coaxial-dipole would just about tune up on 160m but its replacement, a standard 40m half-wave dipole wouldn’t. The wave trap will trap out any undesired signals within its tuning range. This adapter is compatible with the Hopper family and Wally receivers. According to Kevin Loughin (KB9RLW), this low cost "tuner", made from readily available parts, is especially useful for random length wire antennas--the type many radio amateurs use in the field. I'd like to make or buy a balun for this tuner. The Versatile L-Network. Tunable impedance tuners placed in between the antenna and the RF front end minimize mismatch loss over broad frequency ranges. You get the popular MFJ-941E, all of its guts totally apart so you can build it yourself. Of course, a balanced antenna tuner should be used with this type of antenna, and they can be easily built, too. Of course the first ham project here has been to get an HF antenna up. station -- a Yaesu FT-857 with a "homebrew symmetrical double-L matchbox tuner" feeding 300-ohm TV lead-in wire to an antenna. Introduction and Purpose. Antenna Transmatch Tips. The 4sqrp, L-tuner, SLT, and Elecraft T1 are in use in Allison’s QRP rigs for power up to 10W. From its laboratories near the nation’s capital, LDG continues to define the state of the art in this field with innovative. In the 1980's, I designed an Ameritron ATR-10 antenna tuner (not related to any current Ameritron products). and has a wind load of just 2 square feet. Kevin Loughin (KB9RLW) shows us how to use locally available materials to design, build, and use this useful tool for antenna designers. Homebrew Remote ATU MFJ993 Okay, so technically I'm using a commercial atu. You can either homebrew your own one (very easy and lots of designs available on the internet - just use Google) or buy a 2m/70cm antenna from any shop that sells amateur radio equipment. Putting this in to an L network calculator shows you would need a 83 pF shunt capactior then a 1. MFJ "roller inductor" as used in the MFJ989C T-network antenna tuner. As shown in the schematic of the tuner in Fig. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). ATU Matching Network The matching network used in this ATU design is a basic L-match. The antenna tuner system can match loads of up to 26:1 initial VSWR within a frequency range of 3. As shown in the schematic of the tuner in Fig. An all- band doublet shows a different feedpoint impedance at each frequency of operation. It loads and works fine on the pre-WARC bands 40-10 meters. Make your own. There is nothing special about the antenna tuner described on this page. It is difficult to get a horizontal antenna (dipole) high enough to be an effective antenna on 160. There is a web site run by NAQCC member Bert PA1B that describes milliwatting and attenuators in detail. If frequency used before, tunes to it within 20 milliseconds. robb i dont know what the full usable tx range of the antenna is since i only have cb 40 here. But, something like an SGC-237 simply would not do -- I wanted to run the legal limit. I have a really old homebrew L-network that has served me well for at least 50 years. Similar ideas HF - SLINKY-Antenna - Benvenuti su OfficinaHF! See more. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). A lot of Hams hate ‘antenna tuners’, and it’s quite understandable given that there are some common and very bad practices concerning tuner usage. Feedline Antenna. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). There is nothing special about the antenna tuner described on this page. A Z-MATCH TUNER FOR 10 THRU 80 METERS THIS TUNER ONLY HAS 2 CONTROLS AND WILL TUNE ALMOST ANYTHING ! I really didn't need another antenna tuner, but I had the parts in my junkbox and figured I'd build a homebrew Z-match tuner just for something to do. The ATR10 Ameritron was a companion to the AL84, and was designed as a companion bandpass 600-watt antenna tuner. The best results work when you have an antenna with a large vertical component. L - Network Tuner Ham Radio Antenna A KC5LDO L - Nework Tuner, W5DXS - Heart Of Texas DX Society Amatuer Radio web page of information about DX, contesting and other Ham related information. Hence it is called very versatile tuner circuit. Logged radiolistener. (antenna tuner) is that the capacitors can be fairly compact without worrying about breakdown. All DOUBLE BAZOOKA SHORTENED INVERTED-L antennas will operate on other bands with the aid of an antenna tuner. D220R: Mobile Discone Scanner Antenna. A simple "L" network (with the antenna attached to the capacitor side) provides a good match for a high-impedance load, such as a half-wavelength wire. Youkits MT1 QRP Long Wire Antenna Tuner. ANTENNA TUNER CIRCUITRY The antenna tuner is a high pass “T” network with two series variable capacitors and a shunt variable inductor connected between them and ground. It utilizes a 9:1 UNUN transformer in order to bring the impedance of the antenna to more manageable values for your antenna tuner. Neither your receiver nor your antenna are likely to be 50 ohm systems, so I am not surprised the balun didn't improve things. In the 1980's, I designed an Ameritron ATR-10 antenna tuner (not related to any current Ameritron products). Technically this schematic depicts a pi network, but Depending on your antenna one of the two capacitors can be eliminated for lower cost to make the. Equally important, the T1 always tries to achieve a 1. 8 milliamps. Balun vs Antenna Tuner. The 4sqrp, L-tuner, SLT, and Elecraft T1 are in use in Allison’s QRP rigs for power up to 10W. Homebrew Remote ATU MFJ993 Okay, so technically I'm using a commercial atu. The inductor switch is the most likely component to burn up in any antenna tuner. This page is ment to fill with antenna experiments and antenna system related topics. Suburban antenna for 630m. Since the tuner will be automatically tuned, the capacitors and inductor are controlled with motors. That is the main reason why L-networks are rarely chosen for a homebrew antenna tuner project. I don't plan to run more than 100 watts, and will probably start experimenting with QRP. Homebrew balanced-L antenna tuner. Most auto-tuners use a set of Capacitors and Inductors in a relay switched binary sequence to form either a switched L or T network. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). Due to the fact that one wire leg of the antenna is shorter than the other, the OCF is more convenient to erect than a regular center fed dipole. All my tuners use choke baluns. Not being completely satisfied with the MFJ941D so-called "antenna tuner", I decided to build a better Xmatch. Those get used for the inverted L and the 160M Inverted V as all the other antennas are 50 ohm resonant removing losses though a tuner and coax. Can be matched to coax for single band operation. AT-502 - Automatic Remote Controlled RF Antenna Tuner 200 Watts for Random Length Dipoles or Loops 1. This is where the L-Match tuner comes in. I have the Ten-Tec 238B which purchased many years ago, working fine without any problem. Antenna matching networks are known by names such as Transmatch, ATU (antenna tuning unit), antenna matcher, and antenna tuner. If you're using different length monobanders, then an UNUN is the preferred matching method. That works good for me with a balanced line fed antenna and all power levels. I over-built this one to make it clear for the video, but you could make it smaller, put it in a nice box with labels and paint. Suburban antenna for 630m. If one happens to have an antenna analyzer that works at the desired frequency, this is by far the best option to adjust the tuner. The antenna diameter is 2" OD at the bottom, 0. These relays hold the tuning configuration even when power is removed; once matched, the tuner automatically enters a low-power mode where it draws only 0. Forgoing the need for a tuner (which is arguably not too big a deal) let's have a look at the predicted patterns using NEC. (Note that the plots above are for a highpass L-Network. The basic G5RV antenna measures only 102 feet across the top for 80 thru 10 meter operation, and is fed at the center through a low loss 34 feet feed-stub. Basic L network tuner with multi-tap inductor. The antenna diameter is 2” OD at the bottom, 0. 5MHz to 51MHz). It is used with a balanced feed line. Using this antenna tuner is quite easy: since the topology of the matching network has only two parameters to adjust, there is no risk to find a "wrong" and lossy match. On 10, the match may be more of an illusion than an effective reality with some designs. The categories on the left and right contain links to the articles. In October 2012 I changed my 160 meter transmitting antenna to an Inverted L with FCP (folded counter poise). A broad portfolio of ACS switches and configurable tuners allow for the creation of efficient antenna tuning solutions in various applications. Lowell, N1LO. When used with even the simplest LC tuner in an L network configuration, the "broomstick" is quite competitive with any other indoor antenna. Kevin's instructions are clear and easy to follow. If you are not in a hurry all of the necessary components can be found used for very reasonable prices. We have gone to great lengths to adapt unbalanced antenna tuners (ATUs or transmatches) to service with balanced lines. N4JTE; 6 BAND “ RIBBON” $35 ANTENNA-----This antenna article is geared towards new Hams and antenna builders looking for a very inexpensive 6 band antenna that can be efficiently fed with 50 ohm coax without a tuner. (Note that the plots above are for a highpass L-Network. Antenna tuners An external antenna tuner is often used in conjunction with HF antennas to tune antennas to resonance within a band. This antenna tuner will match end-fed half-wave vertical or inverted-L wire antennas to low impedance transceivers or coaxial cables with high power-transfer efficiency. I have used a homebrew L tuner in the past, but it had fixed taps, and every time I made a change to the antenna system, I had to rewire the tuner. First, let me add a supporting argument for the 1/4 wl inverted L. Two weeks later I found a czech webshop, offering a kit called “Altoids L-tuner”. T network antenna tuner. As the "counterpoise" itself approaches a half wavelength, the impedance approaches 5000 ohms. You have 3 options, T network, Pi network or link coupled L networks. Provisional Application No. the same antenna fed a 4:1 balun wound with 75 ohm coax on two separate type 43 ferrite cores and a remotely sited tuner fed via 200ft of low loss LDF2-50 coax vs. One of the antennas that has been around almost that long is the inverted-L. Here is a YouTube link on. The third insulator is tied to the lowest part of the antenna and another support line is passed through the insulator and tied off to a support. Saturday, February 25, 2017 Ham Radio - Build your own L network antenna tuner. It Can Be Installed On A Typical 1/4 Acre Suburban Lot. The list includes tuners which are currently available on the market, as well as a few which are only available on the used market. It will match almost any random length of wire to any transmitter from 160 thru 10 meters. On 20 meters the antenna will be too short and thus capacitive. SCHEMATICS. They confirmed that the types of people who buy the book meet the profile above. The MFJ-934 combines a versatile antenna tuner with an artificial ground. Build Your Own Antenna Analyser for under $50 Beric Dunn K6BEZ $20. This configuration allows a wide range of impedances to be matched to the 50 Ω output impedance of the radio. The Ameritron ATR10 antenna tuner used a network functionally identical to the Johnson Matchbox series. The whip tuner section uses a reversible "L" network. Since the tuner will be automatically tuned, the capacitors and inductor are controlled with motors. I don't plan to run more than 100 watts, and will probably start experimenting with QRP. 8 to 30 MHz. The MFJ-1625 Window/Balcony Mount Antenna will allow the operator to get on the air from locations where antenna size is limited. This is an End-Fed Half-Wave (EFHW*) antenna for 160/80/60/40m. I use it to quickly determine L and C values to match new antenna configurations. NorCal Doublet Antenna By Doug Hendricks, KI6DS The NorCal Doublet Antenna came about due to my desire for a simple antenna that could be erected very fast, only needed one center support, and did not take up much storage room. A while ago Tjeerd PA3GNZ donated me some Barkleys mint tins (identical to the famous Altoids tins), which are rather popular by QRP builders to house small homebrew stuff. Antenna Transmatch Tips. 6AH6 Electronic T/R Switch Manually switching between transmit and receive when using one antenna can easily become tiresome, as you must remember to switch and do it quickly. There are many different configurations and styles of the LCT tuner to match different feed line impedances. Antenna and related topics. You won't even need to change modes to tune. Hf Radio Dipole Antenna Diy Tv Tv On The Radio Radio Amateur Ham Radio Antenna Communication System Air Cannon Ham Soup As an amateur radio enthusiast, [Andrew] sometimes has to set up impromptu antennas up to 160 meters in length. The current Model 238-C is still available new, but it is not cheap. I'm building the "QRP manual days Antenna Tuner Tune. I saw that several tuners for this type antenna didn't require much more than an L-network, so I ditched one of the variables. I wanted to demonstrate that it is very easy to build an automatic antenna tuner with the Arduino. HVC21: 15m Loading Coil for HV7A & MV3A. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. balun on the tuner output. I have the Ten-Tec 238B which purchased many years ago, working fine without any problem. DOWNLOAD MANUAL MFJ Catalog Dealer Listing TUNERS, ANTENNA TUNERS: WEATHER STATIONS:. On 80m the antenna’s propagation is NVIS. One of the antennas that has been around almost that long is the inverted-L. This is be- cause they do not provide a match between the feeder and the antenna. Collinear antenna building, by Karl Shoemaker, AK2O. (Note that the plots above are for a highpass L-Network. Two weeks later I found a czech webshop, offering a kit called “Altoids L-tuner”. If you are tuning an antenna that has MORE than 50 ohms impedance (like his big long wire), you want the coil to go to the radio. This type of tuner is specifically used for open wire transmission lines with balanced antenna systems, generally in the range of 450 - 600 ohms. It is a simple T-network and I have found that it can match any unbalanced antenna system I've ever put on it. Automatic Antenna Tuner developed by lCOM Iutili'zing the Even when the'auto-tune circuit is turned off, the AT-150 still functions. The first thing I did was buy some 24 guage black wire, specifically this 100 foot spool. The following is a design tool which calculates the values for an L matching network. 8 - 30 MHz continuously, including MARS and WARC bands. It is used with a balanced feed line. It weighs just 20 lbs. N4JTE; 6 BAND “ RIBBON” $35 ANTENNA-----This antenna article is geared towards new Hams and antenna builders looking for a very inexpensive 6 band antenna that can be efficiently fed with 50 ohm coax without a tuner. The plating rubs off and the contact resistance becomes intermittent and high because the base metal is not reliable any more. That works good for me with a balanced line fed antenna and all power levels. You get the popular MFJ-941E, all of its guts totally apart so you can build it yourself. A 100-watt Compact Z-Match Antenna Tuner By Phil Salas AD5X I’ve been reading about Z-Match antenna tuners for quite awhile now. Commercial antenna tuners use unbalanced circuits such a Pi-, T-, or L-network to match unbalanced loads to 50 ohms for our transmitters. The Ameritron AL-811 power supply is built tough so you get peak performance year after year. Doublets, ladder line and automatic remote tuners We're back in the old QTH of Wilton, New Hampshire. Loop and pre-matching circuit Uses a ladder line as impedance transformer The length of the ladder line is approx. W8ZR High-Power Antenna Tuner - This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. It is also used to build high-pass, low-pass and band-pass filters. I'm building the "QRP manual days Antenna Tuner Tune. The MFJ-934 combines a versatile antenna tuner with an artificial ground. I am using the QRP L-match with an 80m EFHW mounted as an inverted V for SOTA activations. It is a small, compact tuner that has a sensitive SWR circuit allowing precise tuning with low power thanks to its 6w FSD setting and it has outputs for coax, wire and balanced feeder (although I won't talk about the MFJ 'heavy duty' 1:4 vo. In part one of this series, I covered the use of one brand of commercially available, small transmitting loop antennas, also known as 'magnetic loops'. (That stops harmonic. The tuner is a T-network, high pass tuner with variable capacitors in the series legs and a roller inductor in the shunt leg. antenna! – Proximity to earth changes the impedance – High dipoles are closer to 75 ohms – Low dipoles are closer to 50 ohms • Feedline SWR (and loss) depends on the match between feedline and antenna – Use feedline that matches the antenna • XMTR will reduce power if mismatched – Use an antenna tuner to make the rig happy. The MFJ-934 combines a versatile antenna tuner with an artificial ground. Here are examples of how these goals can be accomplished, using either a military surplus L-C tuner or a commercially manufactured unit, along with an antenna analyzer that measures system performance, including load resistance and impedance, the standing wave ratio, and the net reactance at a particular frequency. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). Welcome! Monty has been a ham for 35+ years. ;-) I did just that in a newer. 9 - Preselector/Matcher Schematic An additional form of antenna matching network is shown in Fig. Back to Basics: Impedance Matching (Part 2) Lou The basic impedance-matching circuit in the MFJ Enterprises MFJ-928 automatic antenna tuner is an L-network with a switched tapped inductor and. "tuner") is a valuable accessory for both your home shack and portable operations. I have used a homebrew L tuner in the past, but it had fixed taps, and every time I made a change to the antenna system, I had to rewire the tuner. This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. They confirmed that the types of people who buy the book meet the profile above. This page contain electronic circuits about Electronic Antenna Tuners Circuits. If you're a CW op, and sound out 'ESE', you'll understand why. Looks and works great. Use something like a pair of 100 or 200 pF caps to ground and a tapped coil in the series leg. Then I started fiddling around with an EFHW and counterpoise. I am using the QRP L-match with an 80m EFHW mounted as an inverted V for SOTA activations. Use something like a pair of 100 or 200 pF caps to ground and a tapped coil in the series leg. Your antenna channels will show up in the DISH guide just like it was a satellite channel, so you can see what is playing up to 14 days ahead. Topic: L Matching vs T Match networks in Antenna Tuners (Read 18006 times) NB8I. C1 — Variable capacitor, 360°, 380 pf, 8 kV. • Variable component “L” networks are not commonly used for wide range matching on the lower frequencies for good reason. After doing some research and reading about the different types of tuners, I settled on a modified "L" Network design for the following reasons:. Since you gave no information at all on the type of antenna you're going to be using with the tuner, it's hard to say what the best configuration might be. What I don't like about the quarter-wave HF vertical antenna, as it's typically installed for home base use is that: It requires a network of buried radials that invariably bleed RF energy to the ground, causing signal losses. Also, most of them have a maximum SWR mismatch, over which they do not operate. Back to Basics: Impedance Matching (Part 2) Lou The basic impedance-matching circuit in the MFJ Enterprises MFJ-928 automatic antenna tuner is an L-network with a switched tapped inductor and. I have some experience with this from designing commercial antenna tuners. Hence it is called very versatile tuner circuit. The plating rubs off and the contact resistance becomes intermittent and high because the base metal is not reliable any more. Remote Control Port Plug in the MFJ-993RC (this is a remote control that can be used for MFJ's line of IntelliTuner™ Automatic Antenna Tuners) remote control and put your tuner at your antenna. Not being completely satisfied with the MFJ941D so-called "antenna tuner", I decided to build a better Xmatch. His latest is an even nicer tuner, his so called Hex-tuner. Homebrew L-C-L Antenna Tuner This homebrew transmatch is similar to the design of the famous Murch Ultimate Transmatch, which is the basis for nearly all commercial transmatches in production today. You can more easily achieve a 1:1 SWR with an tuner other than an L network, but is more likely you’re dissipating RF output within the tuner itself. Commercially sold antenna tuners are usually fancier, using Pi- or T- networks. Welcome to my EZ-Tuner website! This site is intended toaccompany the three-part series of QST articles on the "EZ-Tuner" from the April, May, and June, 2002 issues, and the writeup in the 2003 edition of the ARRL Radio Handbook. If you're using different length monobanders, then an UNUN is the preferred matching method. But in all application you need to "adjust" for optimum performance. A Balanced Balanced Antenna Tuner Are you using the right antenna tuner for the job? If you use a balanced, open-wire-fed antenna, the versatile balanced L net- work is the circuit for By Richard L. The S-Match is not available for purchase, but is very simple to home-brew. Kincaid, WD8OYG Merge a modern microprocessor with the time-proven L network and what do you get? The AT-11 antenna tuner. HV7A: Mobile antenna system. An antenna tuner is. An efficient Magnetic Loop Antenna has a very high Q. Basic L network tuner with multi-tap inductor and a single variable capacitor. The Elecraft K2 is a modern kit, reminding us of Heathkit of years gone by. robb i dont know what the full usable tx range of the antenna is since i only have cb 40 here. Welcome! Monty has been a ham for 35+ years. To this end, I purchased and installed the MFJ-998RT Automatic Remote Antenna Tuner. This tuner lets you set and control the match with no sensitive microprocessor that could fail and put you off the air. Hence it is called very versatile tuner circuit. This term is widely misused in both the ham and listening communities. A con- sideration of the L network is provided In the followmg comment In a footnote: "For tuners dedicated to specific anten-. 0:1 like some tuners. 'Nother Awesome Portable Antenna Design - The St Louis Vertical I value in a homebrew antenna design. The Versatile L-Network. If you are tuning an antenna that has LESS than 50 ohms (say a loaded whip or other short antenna), the coil goes towards the antenna. After doing some research and reading about the different types of tuners, I settled on a modified "L" Network design for the following reasons:. The plating rubs off and the contact resistance becomes intermittent and high because the base metal is not reliable any more. The next evolution in the search for the all band HF antenna was made by Brian Austin, ZS6BKW, now G0GSF, who in 1985 was a professor at the University of Witwatersrand, Johannesburg, South Africa. However, there are some combinations of L and C that allow for better power transfer (and minimise losses) than others. The list includes tuners which are currently available on the market, as well as a few which are only available on the used market. Get 160-6 Meters Coverage and 1500 Watt Operation with a single antenna! This MFJ-2990 is a 43-foot self-supporting vertical antenna that covers 160 through 6 Meters with the use of an antenna tuner. Recently I've become interested in antenna tuners (due to issues I've recently had with them) and I've begun exploring the topic. HVC14: 20m Loading Coil for HV7A & MV3A. The main category is Antenna Tuners that is about Homebrewing antenna tuners. Here is a little project to help facilitate our field day operations and give us a portable random wire or doublet tuning with 100 watt capability. I've also tried a lot of T, Z, Pi and link-coupled matching networks, but I always seem to go back to simple L-networks. 6 m (84 ft), because such a length permits parallel tuning of the antenna tuner circuit on all bands from 80 to 10 m with conveniently located coil taps in the antenna tuner coils for each band, or, where the alternative form of antenna tuner employing a three-gang 500 pF/section. My Top Five Backyard Multi-Band Wire HF Antennas L. This makes construction easier if you're using a metal case. Seriously kludge. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. Relocating the balun to the input of an unbalanced network does not help the balun do a better job and complicates tuner construction. That is the main reason why L-networks are rarely chosen for a homebrew antenna tuner project. 5K End Fed Long Wire Antenna. 8 to 30 MHz. Use of a L-network antenna tuner, like the MFJ Versa Tuner V Model J-989, allows me to tune the rest of. Ideally we want to use the lowest amount of inductance required as the windings on the toroid are more lossy than the capacitors. Youkits MT1 QRP Long Wire Antenna Tuner. its great for traveling, emergency or as a makeshift antenna. It will match almost any random length of wire to any transmitter from 160 thru 10 meters. When used with even the simplest LC tuner in an L network configuration, the "broomstick" is quite competitive with any other indoor antenna. HF VHF ANTENNA TUNER. This page is ment to fill with antenna experiments and antenna system related topics. 0 out of 5 stars Simple QRP T-network tuner for 80m-10m ham bands. So my offering to FDIM 9 will also be a matter of 5: my personal selection of the top 5 HF wire antennas for the backyard and for multi-band operation. OFF Center Fed/Loaded HF Antennas VE3KL •Searching for the elusive 40,30,20 m Short Antenna •Small, no bulky traps, minimum of components •Leads to a general design approach for a broad class. T network antenna tuner. This home brewed balanced link coupled tuner is designed for 160 - 20 meters, and is rated for maximum legal power on the amateur radio bands. 6 m (84 ft), because such a length permits parallel tuning of the antenna tuner circuit on all bands from 80 to 10 m with conveniently located coil taps in the antenna tuner coils for each band, or, where the alternative form of antenna tuner employing a three-gang 500 pF/section. I've also tried a lot of T, Z, Pi and link-coupled matching networks, but I always seem to go back to simple L-networks. published an article in Radio ZS, the journal of the South African Radio League on. The wave trap will trap out any undesired signals within its tuning range. 0:1 like some tuners. By comparing them, you should be able to construct a tuner to your own particular requirements. Volts, Amps and Watts A loss resistance = X/Q ohms is considered to be in series with each component. Antenna modeling suggests that the impedance is closer to 1800 ohms depending on the "counterpoise" length used. Attach your antenna coax to an output on your antenna tuner. Antenna Tuners. Then I have about 15' of coax that screws to the match box and I run it into my car window to my operating position in the drivers seat. Here is a recommended tuning best practice for a tapped-inductor T-network tuner:. It turns a random wire into an effective antenna that works. I just attached a ring terminal and some wire to the rotor shaft. And since we NEVER work over 5 watts, this homebrew project will be nice addition to your arsenal without breaking your ham budget. I’ll try not to get too much into mathematics, and I’ll also try to squash a few myths. Figure 4 - Link Coupled Tuner, Switchable You can also use a commercially made, unbalanced (generally a T-type circuit) tuner, with a balun to tune this system. I am using the QRP L-match with an 80m EFHW mounted as an inverted V for SOTA activations. If you didn't guess I am a ham. Kees/PA0LL, unfortunately Kees is SK, made a S-match tuner for me some years ago. I have also used the antenna with an L-network tuner on 75, 40, and 20 meters with delightful results stateside. DOWNLOAD MANUAL MFJ Catalog Dealer Listing TUNERS, ANTENNA TUNERS: WEATHER STATIONS:. Then I started fiddling around with an EFHW and counterpoise. If you are tuning an antenna that has MORE than 50 ohms impedance (like his big long wire), you want the coil to go to the radio. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. "tuner") is perfect for random wire antennas or for end fed half wavelength antennas. According to Kevin Loughin (KB9RLW), this low cost "tuner", made from readily available parts, is especially useful for random length wire antennas--the type many radio amateurs use in the field. A series L-C circuit can be used to match a low-impedance load, as presented by a quarter-wave wire. 28, 2013 and entitled "FLEXIBLE L-NETWORK ANTENNA TUNER CIRCUIT," the disclosure of which is expressly incorporated by reference herein in its entirety. EFHW-16040-2K Multiband band End Fed Half Wave Antenna. matchbox/antenna tuner located in the shack. Here are examples of how these goals can be accomplished, using either a military surplus L-C tuner or a commercially manufactured unit, along with an antenna analyzer that measures system performance, including load resistance and impedance, the standing wave ratio, and the net reactance at a particular frequency. Tuning out the leakage inductance of the primary would require increasing the capacitance which is like adding an additional L network made up of. The antenna diameter is 2" OD at the bottom, 0. Whenever I would go to a sidewalk sale or hamfest I would pick up any components that might someday come in handy to make a tuner. Antenna matching networks are known by names such as Transmatch, ATU (antenna tuning unit), antenna matcher, and antenna tuner. I realize that good antenna tuner components can be quite expensive when purchased new if you are even lucky enough to find a supplier. The large and well legible LC-display shows settings of the tuner like C and L settings, SWR, selected antenna output and more. It utilizes a 9:1 UNUN transformer in order to bring the impedance of the antenna to more manageable values for your antenna tuner. I really don’t like the name “antenna tuner. automatic antenna tuner, automatic antenna tuner schematic. My Top Five Backyard Multi-Band Wire HF Antennas L. (Note that the plots above are for a highpass L-Network. It covers the 80 meter through 6 meter Amateur Radio bands and can handle up to 100 watts SSB, 25 watts digital. I captured a video of the tuner in operation, as viewed on the monitor inside the shack. MFJ-939 uniquely measures your antenna’s complex impedance (R, X), computes the L-network and snaps in needed components for instant matching.