Homebrew L Network Antenna Tuner

The original noise of S9 was reduced to S2 when the tuner controls were where they should be. 5 - 54 MHz (including 80m – 6m amateur bands) without any adjustment with a wide range antenna tuner. Performance is equal to a J-pole, but it’s smaller, less obtrusive and more the antenna. (20m was assumed for this discussion). With proper system design, an antenna tuner or transmatch can allow a non-resonant antenna to operate nearly as efficiently as one that is carefully cut to resonance. pmd 34 2/20/2004, 7:38 AM By Paul Danzer, N1II Open W e Feed Line— A Second Look Put up the longest dipole you can fit, feed it with open wire line,. There are many different configurations and styles of the LCT tuner to match different feed line impedances. The interesting part is that using the bridge is easier to see and hear the dips and adjust the tuner for better match. The YouKits MT-1 is a manual long wire QRP antenna tuner that will handle up to 10 watts output power. Info below found on the Tuner here on ebay so I don't know if all is correct. This tuner lets you set and control the match with no sensitive microprocessor that could fail and put you off the air. 63 mm) enameled copper wire (stranded) is recommended for. Jerrie has his antenna mounted as an inverted V with the center at about 38 feet and the ends drooping down to around 20 feet off the ground. The feedline is now a multiple of a half-wave (60 to 70 feet) and connects to a full-wave high impedance antenna (100 to 140 feet). To do this. Remote IntelliTuner is mounted in a durable hard plastic case that measures just 9 1/4W x 3H x 14 1/4D inches. I wanted something a bit smaller and lighter than my LDG YT-100 for use with my Yaesu FT-817ND. I have a really old homebrew L-network that has served me well for at least 50 years. I started out with a Harris RF-601 remote coupler but that was overkill since I really only needed to have the antenna work on 40 through 15 meters. Antenna Tuner Schematics Mfj Antenner Tuner Manual And Schematic. 275 Watt (Switch Failure) MFJ-212 Matchmaker; Ten Tec 1051 Noise Bridge; Ten Tec 1225 Wattmeter Kit. Remote IntelliTuner is mounted in a durable hard plastic case that measures just 9 1/4W x 3H x 14 1/4D inches. Since this antenna was designed to operate over several HF bands, a single matching network is impractical. (l/4 or l/2 on 80 meters) the end impedance will be high on the bands that are harmonics of 80 meters and it can be fed through a tuned circuit, as in Figure 10. But G3TXQ’s research appears to suggest that a 1:1 current balun would be a better choice at least when one is using a T-network type antenna tuner. It is an "L Network. Ham Radio QRP Portable radios, operating, Amateur Radio, QRP. ) This page details several T-match tuners. The balanced tuner must convert the unbalanced antenna input/output of the antenna to a balanced 50 ohms and then drive it through an impedance transforming network to the antenna system's impedance at the end of the open wire feeder. The company is run by experienced radio amateurs and aims to develop a wide range of high quality and affordable automatic antenna tuners. more Antenna Tuner AT T-1. mAT-TUNER automatic antenna tuners, Easy-Rotor-Control rotator controllers, W7FG Vintage Manuals, 4O3A Signature products. 08 KB Home Brew the Blockbuster. Potable Vertical Moxon for 14 MHz 20m band. 4-port-box home brew antenna splitter can be tuned by the tuner in your radio. Arnie Coro's "Easy-to-Build PI Network Antenna Tuner" by All The News That Doesn't Fi » Tue, 02 Oct 2001 12:14:55. An inexpensive way to begin is to build your own antenna tuner. A MATCHING PRINCIPLE The first approach was to make use of a principle described by the writer in Amateur Radio, December 1985. This index has a wide collection of antenna schematics, that can be very useful for the enginner or the student who need a circuit / schematic for reference or information for a project that includes recieving or transiting proccesses. Forrest Cook Introduction. 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. A series L-C circuit can be used to match a low-impedance load, as presented by a quarter-wave wire. 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. After doing some research and reading about the different types of tuners, I settled on a modified "L" Network design for the following reasons:. Antenna Project – Portable 70cm 7el DL6WU Yagi 16/06/2018; Top Posts & Pages. I have been able to match all my antenna up on the roof, and there is absolutely no signs of any component heating or arcing. As stated before, if you have a suitably located tree or two and/or a flagpole or like, then go for it. My antenna of choice for portable ops is 60′ of old #18 separated speaker wire, 30′ of haphazardly placed counterpoise of similar wire, and a homebrew L-network tuner. T network antenna tuner. No idea how it would play on 30, 17, or 12 meters. Most antenna tuners have an inductance rotary switch and two capacitors. The folks who use these tuners speak very highly of them, but it. With this, you can deploy a half-wavelength. (Note that the plots above are for a highpass L-Network. The ATR10 Ameritron was a companion to the AL84, and was designed as a companion bandpass 600-watt antenna tuner. Model 238C uses our tried and true “L” match design used in the earlier 238/238A/238B models with a new cosmetic design, larger heavy duty tuning capacitor than the original and backlit cross-needle SWR and peak power output metering. It's a C-L-C type setup with a series connected capacitor, a parallel coil, and another series connected capacitor. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). Kevin's instructions are clear and easy to understand. Simple to build it's ideal for a variety of unbalanced antenna including end-fed wires. 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. In case you didn't read the articles, the "EZ-Tuner" is a homebrew automatic legal-limit antenna tuner that covers. I'm planning to build a multiband antenna and feed it with twinlead or ladder line since it's less lossy than coax. and has a wind load of just 2 square feet. Assembly of the kit will need reasonable homebrew skills and. Homebrew balanced-L antenna tuner. A Rapid Deployment (Pneumatic-Launched) 120 foot Inverted L Antenna Antenna Support Poles and Masts Portable Ultralight Loaded Dipole A Photographic Survey of HF Mobile Antenna Mounts Elecraft K2 Projects. After doing some research and reading about the different types of tuners, I settled on a modified "L" Network design for the following reasons:. I use a homebrew antenna tuner which is a PI network but also has a C series only capability. It is a modular design, so I hope that it can be used to experiment with different configurations, integrating with the antenna, etc. •Write the frequency and tuner setting down in a note book or spreadsheet. 200 WATTS, RANDOM WIREThe MFJ-16010 is a variable L-network random wire antenna tuner designed to match the low output impedance of your transmitter to the high impedance of a random wire (or vice versa). The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. With this, you can deploy a half-wavelength. Good video! Note that L network tuners are completely reversible. 'Nother Awesome Portable Antenna Design - The St Louis Vertical I value in a homebrew antenna design. Antenna Project - Portable 70cm 7el DL6WU Yagi 16/06/2018; Top Posts & Pages. A FEW SIMPLE HOMEBREW PROJECTS Making a non-resonant bit of wire work from 160m to 2m. 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. See my Homebrew Antenna Tuner with SWR-indicator-Bridge, switchable LowPass and HighPass. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. My antenna of choice for portable ops is 60′ of old #18 separated speaker wire, 30′ of haphazardly placed counterpoise of similar wire, and a homebrew L-network tuner. The antenna diameter is 2” OD at. The tuner is a T-network, high pass tuner with variable capacitors in the series legs and a roller inductor in the shunt leg. An L-network random wire tuner is probably the simplest matching network in existence, yet it does a good job as long as the antenna is at least a quarter wavelength at the lowest operating frequency. The L-network does not offer the feedline isolation that a link coupled tuned network does but it does offer a larger bandwidth for a given setting. output rated antenna tuner covering 1. 8 to 30 MHz. In the 1980's, I designed an Ameritron ATR-10 antenna tuner (not related to any current Ameritron products). This is usually done in the form of an inverted L due to the length (unless you have tall wide spaced trees). Then the configuration becomes a L tuner in practice with a shunt L followed by a series C when seen from the load in towards the generator. I find that an end-fed half-wave is a great holiday antenna. 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. The DOUBLE BAZOOKA antenna design was first conceived as a radar antenna in the early 1940's for use by the U. The CODAN 9103 HF Automatic Antenna Tuner has been designed more HF Antenna Tuner AT 4002. Make the coil about 10 turns and about two inches in diameter from 14 gauge wire or larger. Read honest and unbiased product reviews from our users. It is exceedingly ugly, but it does what I want. ; may be installed as a dipole, inverted-vee, or full sloper. Most antenna tuners have an inductance rotary switch and two capacitors. The 365pF variable caps that fit in a 2 cubic inch space can typically handle up to 10 watts. Designed as a 20m antenna. The homebrew bug bit me in the backside and I just had to build something. It is a modular design, so I hope that it can be used to experiment with different configurations, integrating with the antenna, etc. Let's assume we have a transmitter in our shack, and were feeding a vertical out in the backyard. An antenna Analyzer provides functions for checking and adjusting antennas and coaxial feeding lines. 0 out of 5 stars Simple QRP T-network tuner for 80m-10m ham bands. com has the best deals and lowest prices on hf antenna tuners. his quest for the "ideal tuner" to base hrs design on the popular T network. Most antenna tuners have an inductance rotary switch and two capacitors. Description. If you couldn't get the SWR down to 1:1, try connecting the antenna tuner/radio to the other BNC connector and repeat the previous step. It also acts as a low pass filter. units are readily available, or you can easily homebrew one; circuit details are provided in this manual. Its overall length Two are the key points making this antenna robust enough: a) Find great deals on eBay for 20 Meter Antenna in Plotter Ham and Home Brew 20 Meter Rotatable Vintage Large Ham Antenna Tuner , matcher 10 15 20 m ,meters 20m Projects - Antennas. Working 160M From a Small Lot (and Larger Ones Too) short antenna so it looks longer to coil at the base that his K2 auto tuner. It's enclosed, with an SWR bridge, in a box of cemented polystyrene sheet from the typical hobby store. Dark jacketed wire is virtually invisible — Don't let antenna restrictions keep you off the air. I then connected the shield of the coax to the earth and the centre to my antenna wire via a terminal block. Xtreme Signal 70 Mile VHF/UHF Yagi Outdoor TV Antenna (HDB91X) If you are trying to get UHF up to 70 miles and high-VHF up to 25 miles away, the HDB91X is a top choice. An additional shorting contact called the "Self-Resonance Killer™" (MFJ Registered Trademark) is applied when less than half of the coil is in use. Link-Coupled Antenna Tuners L. Connect a suitable length of antenna cable to the antenna terminal. It utilizes the well-known Z-match circuit, which is especially useful for balanced antennas (like dipoles and loops). Simple to build it's ideal for a variety of unbalanced antenna including end-fed wires. However, like to have another one connect to my second amplifier. 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. Working 160M From a Small Lot (and Larger Ones Too) short antenna so it looks longer to coil at the base that his K2 auto tuner. Inverted L Wire Antenna •Remote tuner required •Should not be a resonant length •70 or 140 ft recommended Ventenna for VHF/UHF. 28, 2013 and entitled "FLEXIBLE L-NETWORK ANTENNA TUNER CIRCUIT," the disclosure of which is expressly incorporated by reference herein in its entirety. The Versatile L-Network. 9 turns per inch. If the antenna is off-resonance, it will be either - or +j, that is to say, above or below resonance. It will supplement the big horizontal dipole by providing good omnidirectional coverage, with some gain, from 20 through 6 meters. one thing worthy to mention: the antenna-tuner should near the feed point, then the RF energy go out off your lab. I could tune my 75 m loop on all bands up to and including 20 m, but at higher frequencies I could not get the series capacitor small enough. 8 through 220 MHz and offer a wide range of features, depending on model. It seemed to work but it was very narrow banded. ANTENNA TUNER, 200 WATTS, RANDOM WIRE. C2 — Fixed capacitors at 4 kV, in combination as needed to resonate antenna tuner at low. At the bottom, I attached my MFJ Versa Tuner. · Works well in vertical, sloping, inverted vee, and inverted L configurations · The matching network is simple to construct and use · Can also use on harmonicaly related bands, such as 40 and 20 meters. What is an Antenna Tuner? • An antenna tuner (coupler is a more correct term) is an impedance matching device which minimizes “mismatch” loss (maximizes power transfer). This page contain electronic circuits about Antennas Circuits. Use a tunable L-Network or any antenna tuner capable of matching high impedance loads, and it's a good multiband system. –Using copper tubing open line for matching –Appeared in the December 1935 ‘Collins Signal’ –Also in The Radio Antenna Handbook -- 1936 –Also in The Frank C. >In closing, just one more true balanced tuner to mention. In many cases, the antenna represents a high-impedance load - and feeding it from the low-impedance output of the transmitter makes for a big waste of precious power. A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. It is exceedingly ugly, but it does what I want. Eliminate send/receive tuner loss. The homebrew bug bit me in the backside and I just had to build something. First, it is SLOW…. Introduction Several months ago, I spent some time building a Lydford 40m QRP SSB transceiver kit. Inverted L Wire Antenna •Remote tuner required •Should not be a resonant length •70 or 140 ft recommended Ventenna for VHF/UHF. 5 at 3910 kHz. The next time you operate on that frequency and antenna, these tuner settings are instantly restored and you're ready to operate in milliseconds! MFJ's new VirtualAntenna Memory system gives you 2500 memories, has a coaxial antenna connector and a binding post for end-fed long wire antennas. To form the rigid coax section, Content Retrieval. Finding the position which gives you a good match with minimum inductance reduces loss and increases the amount power transfered to the antenna. mAT Automatic Antenna Tuners. from what i understand these are not wide bandwidth antennas so i was thinking a tuner would be needed to cover the range of a rci 29xx or magnum 45/257. The diagram below shows the basic idea, and you can work from it to build your tuner. and thanks for the suggestions. This makes construction easier if you're using a metal case. Last Saturday I ordered a pre-built Emtech ZM-2 antenna tuner with UHF connectors and it arrived today. We have gone to great lengths to adapt unbalanced antenna tuners (ATUs or transmatches) to service with balanced lines. 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. I have used it on 80, 40, 30 and 20m. Length Foot Wind MPH; X30A: 2m / 70cm: 2m: 1 1/2l 70cm: 2 5/8l: 3. To my knowledge, currently the only L-Network on the market that can do this is the TEN-TEC Model 238, and its successors, the Model 238-A, the Model 238-B, which are only available used. It covers the 80 meter through 6 meter Amateur Radio bands and can handle up to 100 watts SSB, 25 watts digital. Introduction Several months ago, I spent some time building a Lydford 40m QRP SSB transceiver kit. I wanted something a bit smaller and lighter than my LDG YT-100 for use with my Yaesu FT-817ND. Recently I've become interested in antenna tuners (due to issues I've recently had with them) and I've begun exploring the topic. If it fails, you can replace it without having to do it inside the antenna tuner box with expensive proprietary parts. To do this. However if like me you're faced with a small lot or perhaps in need of a stealth multi-band antenna or just want to get on 80 or 160 meters with something that works!. Kevin Loughin (KB9RLW) shows us how to use locally available materials to design, build, and use this useful tool for antenna designers. 4-port-box home brew antenna splitter can be tuned by the tuner in your radio. From its laboratories near the nation’s capital, LDG continues to define the state of the art in this field with innovative. Use a separate antenna switch. Middle shelf, L-R: Collins 75a-4. The AT-600Pro Autotuner by LDG neatly solved the problem of cost while preserving full flexibility, efficiency and effectiveness of the L-network configuration!. Below are some more photos of my T-network. A reader of End Fed Half Wave matching transformer – 80-20m asked if a better transformer could be made with a stack of 2 x FT240-43 cores and using half the turns. " For general shortwave listening this antenna tuner will work very well with a straight wire of up to 50 or even 75 feet in length. 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. An antenna Analyzer provides functions for checking and adjusting antennas and coaxial feeding lines. Youkits MT1 QRP Long Wire Antenna Tuner. ) can be viewed using the KX1’s ATU menu entry. (CLICK for partial schematic), My father, Ralph, had made the homebrew HF antenna tuner, homebrew HF linear amplifier. 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. DOWNLOAD MANUAL MFJ Catalog Dealer Listing TUNERS, ANTENNA TUNERS: WEATHER STATIONS:. It will supplement the big horizontal dipole by providing good omnidirectional coverage, with some gain, from 20 through 6 meters. This Antenna Tuning Unit also incorporates a 50-ohm QRP dummy load, power meter (1 or 10 Watts full scale), and SWR meter! I have used this ATU for a variety of longwire antennas, including outdoor antennas of various lengths and much shorter indoor (attic) antennas. By comparing them, you should be able to construct a tuner to your own particular requirements. To my knowledge, currently the only L-Network on the market that can do this is the TEN-TEC Model 238, and its successors, the Model 238-A, the Model 238-B, which are only available used. Antenna Tuner State-of-the-art microprocessor-based Automatic self tuning Usable with any SSB transceiver No presets or adjustments Compensates for antenna changes Reduces installation costs Special Features: Duplex Mode, Tune Lockout, and Demand Tune Designed and built by SEA, one of the industry’s leaders. Find helpful customer reviews and review ratings for Zerone 1-30 Mhz Manual Antenna Tuner kit for HAM RADIO QRP DIY Kit at Amazon. Toss your EFHW over a high limb for an inverted-V, raise the far end high for a powerful sloper, or even go vertical with an inverted-L. The MFJ-16010 is a variable L-network random wire antenna tuner designed to match the low output impedance of your transmitter to the high impedance of a random wire (or vice versa). Why do I need to tune an antenna? An antenna tuner or ATU doesn't actually tune the antenna; it provides a matching network. Build an antenna tuner yourself! You can save money and brag about it! This antenna tuner utilizes an L network impedance matching system. Sometimes minimum inductance is when the turns counter is at "0" but sometimes minimum is when the counter is at its highest value; it depends on your make of tuner. Note that I said "through a good antenna tuner" and that doesn't particularly mean an expensive antenna tuner. If I were to build a lowpass L-network Antenna Tuner, I was curious what would be the RMS-Current-Through and Peak-Voltage-Across the inductor and capacitor. If the antenna is off-resonance, it will be either - or +j, that is to say, above or below resonance. In many cases, the antenna represents a high-impedance load - and feeding it from the low-impedance output of the transmitter makes for a big waste of precious power. In case you didn't read the articles, the "EZ-Tuner" is a homebrew automatic legal-limit antenna tuner that covers. Float the tuner from ground and install a balun at the input end; 2. Working 160M From a Small Lot (and Larger Ones Too) short antenna so it looks longer to coil at the base that his K2 auto tuner. The feed-point of this type of antennas (off center) has an impedance of about 300 Ohms. In addition to being one of the world’s smallest automatic antenna tuners, the KXAT1 is very easy to build and install. It also acts as a low pass filter. Handles 200 Watts. This type of antenna used to be called an end-fed Zepp. My first antenna build will likely be designed around that. It loads and works fine on the pre-WARC bands 40-10 meters. I am happily using a doublett-antenna that I feed with a 600 Ohm ladder-feedline. • It is used to match high impedance source to low impedance load. It does NOT tune the antenna! • Old R. Let's assume we have a transmitter in our shack, and were feeding a vertical out in the backyard. The ANTENNA MPEDANCE switch, A2S1, reverses the L-network to match the impedance of. Open Wir DanzerNEW. In the world of amateur radio, "homebrew" is the art of building homemade radio equipment. In all my years, I've never taken an antenna out of a box, or built one from a book, that has not had to be adjusted in the field. But, something like an SGC-237 simply would not do -- I wanted to run the legal limit. The Emtech ZM-2 Antenna Tuner is a nifty little portable transmatch for QRP (low power). 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. It's a C-L-C type setup with a series connected capacitor, a parallel coil, and another series connected capacitor. See text for details. The MFJ-971 has the potential to be a great portable tuner. To work well, however, the ground side of the antenna tuner needs to. Dark jacketed wire is virtually invisible — Don't let antenna restrictions keep you off the air. This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. This antenna covers 80 to 6 meters with low feed point impedance and will work with most radios, with or without an antenna tuner. Basic L network tuner with multi-tap inductor. The antenna tuner system can match loads of up to 26:1 initial VSWR within a frequency range of 3. Use something like a pair of 100 or 200 pF caps to ground and a tapped coil in the series leg. Install July 2012. If it fails, you can replace it without having to do it inside the antenna tuner box with expensive proprietary parts. Why use an Antenna Tuner? The L Match Network. S-Match conversion of a MFJ-989D Versa Tuner V. TenTec model 229 or 238 antenna tuners, or some of the military surplus L-network antenna tuners work very well for this application. Since this antenna was designed to operate over several HF bands, a single matching network is impractical. 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. Homebrew balanced-L antenna tuner. The imbalanced L-network forms the basis for all of the antenna tuners that are currently being sold. Recently I've become interested in antenna tuners (due to issues I've recently had with them) and I've begun exploring the topic. 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. 5", and weighing only 18 ounces, it handles 0. An antenna tuner is. However, if you place the antenna tuner at the antenna lots of things happen and its all good. If the antenna is off-resonance, it will be either - or +j, that is to say, above or below resonance. His main transceivers were Drake Twins and other tube equipment. BUILD AN HF ANTENNA TUNER MAKE A HOMEBREW HF-VHF ANTENNA TUNER (It really isn't all that difficult. The antenna tuner system can match loads of up to 26:1 initial VSWR within a frequency range of 3. DOWNLOAD MANUAL MFJ Catalog Dealer Listing TUNERS, ANTENNA TUNERS: WEATHER STATIONS:. It can match 6-1600 Ohms (SWR up to 32:1) - - thats a 50% wider matching range at a higher power level than lesse. The BT1500A 1500 watt balanced antenna tuner is the only 1500 Watt, Double-L Network antenna tuner on the market today covering 20m to 160m (2500+/-j2500) and 10m - 15m (1000+/-j1000). If I had to do it over again, I would build it. (l/4 or l/2 on 80 meters) the end impedance will be high on the bands that are harmonics of 80 meters and it can be fed through a tuned circuit, as in Figure 10. Neither your receiver nor your antenna are likely to be 50 ohm systems, so I am not surprised the balun didn't improve things. This makes construction easier if you're using a metal case. microprocessor which is driving the whole affair, then measures the antenna’s complex impedance at the chosen frequency, computes the network parameters for the L-Network, adjusts the variable inductor, variable capacitor, and shunt capacitor switch for either the input or output configuration, and finally takes the tuner out of bypass mode. Browse our daily deals for even more savings! Free delivery and free returns on eBay Plus items!. While the antenna presents a reasonable impedance at 60 – 6 meters, it presents a very high SWR at 80 and 160 meters, due to its short length at those frequencies. 5 to 6 dB improvement as measured on 40m by Rudy Severns N6LF. 4"W x 3-1/4"H x 1-3/4"D. As stated before, if you have a suitably located tree or two and/or a flagpole or like, then go for it. Since I have the 238B (L-Match) and thinking to use other tuning method. The single wire is 137 feet long and the feeder is 67 feet. If you are not in a hurry all of the necessary components can be found used for very reasonable prices. This page contain electronic circuits about Electronic Antenna Tuners Circuits. Multi-band with antenna tuner. Current and Peak Voltage in a Lowpass L-Network. An antenna tuner is. In some antenna tuners the inductance switch is replaced with a continuously variable inductance, popularly known as a roller inductor. The ANTENNA MPEDANCE switch, A2S1, reverses the L-network to match the impedance of. Tuner troubles fixed, now huge signals Posted on August 18, 2014 by Bert I didn’t know that my outdoor homebrew tuner was in trouble, but apparently it’s been declining for awhile. Homebrew Antenna Tuner by AA5TB For years I've thrown together simple antenna tuners to get me on the air when needed. This is usually done in the form of an inverted L due to the length (unless you have tall wide spaced trees). True balanced line kW tuners for 160-10? or something shut fed and use coax and an unbalanced L network tuner and lots of radials. In this article, I'll try to explain what is happening when you use an antenna tuner. Tuning Up. Whether you design and build it "from scratch" in the basement workshop or garage, or construct a kit of parts on the dining room table, homebrewing equipment is not hard to do, and a double whammy of a lot of fun - you get to use the equipment when you. The transmitter legally operates with "micro-power" and will not set any distance records but, unlike simpler designs, the frequency stays put and the fidelity is excellent. com in a single category. I always needed a "HEAVY DUTY" antenna tuner that could take about 2KW to match with my Heathkit SB-220. 8-30MHz Wire Antenna Tuner The MFJ-16010 is a variable L-network random wire antenna tuner designed to match the low output impedance of your transmitter to the high impedance of a random wire (or vice versa). The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). outside of the selected frequency band. Antenna Tuners. - Portable Vertical Antenna for 75m and 40m makes up a compact 28 feet high antenna. 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. This type of tuner is specifically used for open wire transmission lines with balanced antenna systems, generally in the range of 450 - 600 ohms. 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. 4 metre length of silicon insulated 18 AWG multi-strand copper wire supported by a 9 metre telescopic pole. Tunable impedance tuners placed in between the antenna and the RF front end minimize mismatch loss over broad frequency ranges. The homebrew bug bit me in the backside and I just had to build something. Antenna tuners (more accurately referred to as "transmatches") make great homebrew projects; they are reasonably simple to build and, when finished, provide a useful piece of equipment. Antenna tuners do not tune the antenna, in the sense of shifting the resonance frequency of an antenna to the operating frequency of the transmitter. There's more to it than what is in your manual or on most how to do it websites! What more is required other than an SWR meter and properly setting the network components for matching the feed line to the antenna tuner?. Most of them tend to stick to vertical antennas with a 1/4 or 1/2 wave sizing. The CODAN 9103 HF Automatic Antenna Tuner has been designed more HF Antenna Tuner AT 4002. The SlinkTenna is a compact, quick deploy, portable, Helical Dipole ham radio antenna system. • NOT different from any other impedance matching circuit. I started out with a Harris RF-601 remote coupler but that was overkill since I really only needed to have the antenna work on 40 through 15 meters. The antenna may also be used in the form of an inverted-V (L). 28, 2013 and entitled "FLEXIBLE L-NETWORK ANTENNA TUNER CIRCUIT," the disclosure of which is expressly incorporated by reference herein in its entirety. Of course the first ham project here has been to get an HF antenna up. Use a separate antenna switch. The 4002 is designed specifically for short vehicular whip. Toss your EFHW over a high limb for an inverted-V, raise the far end high for a powerful sloper, or even go vertical with an inverted-L. Good video! Note that L network tuners are completely reversible. 5 GHz PHEMT LNA 0. It covers the 80 meter through 6 meter Amateur Radio bands and can handle up to 100 watts SSB, 25 watts digital. In all, this antenna worked ok. The ATR10 Ameritron was a companion to the AL84, and was designed as a companion bandpass 600-watt antenna tuner. To do this. There's more to it than what is in your manual or on most how to do it websites! What more is required other than an SWR meter and properly setting the network components for matching the feed line to the antenna tuner?. (antenna tuner) is that the capacitors can be fairly compact without worrying about breakdown. The control system uses a phase detector which samples the transmission line voltage and current flowing to the antenna, and determines which way the antenna system is tuned. 8 through 220 MHz and offer a wide range of features, depending on model. These antenna tuners cover frequencies from 1. (Note that the plots above are for a highpass L-Network. This tuner lets you set and control the match with no sensitive microprocessor that could fail and put you off the air. See text for details. It covers the 80 meter through 6 meter Amateur Radio bands and can handle up to 100 watts SSB, 25 watts digital. This link is listed in our web site directory since Sunday Sep 30 2012, and till today "L Network Antenna Tuner" has been followed for a total of 1031 times. 200 MHz by a Vector Network analyzer. 5", and weighing only 18 ounces, it handles 0. (20m was assumed for this discussion). Youkits MT1 QRP Long Wire Antenna Tuner. In this paper, a 4G antenna tuner integrated in STMicroelectronics 130 nm CMOS SOI technology and operating between 2500 MHz and 2690 MHz is described. HF VHF ANTENNA TUNER. A lowpass L-Network performs similarly as capacitor Q is changed). (20m was assumed for this discussion). A much better alternative to any of these three antenna designs is running the open-wire line from the center of a dipole all the way to a balanced antenna tuner, which was recommended by Louis Varney, G5RV himself. It is also used to build high-pass, low-pass and band-pass filters. It is possible to put up loaded antenna for the 630m Ham band in a suburban backyard. In this article, I'll try to explain what is happening when you use an antenna tuner. Cebik's site. 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 folks who use these tuners speak very highly of them, but it. It's a C-L-C type setup with a series connected capacitor, a parallel coil, and another series connected capacitor. Dave has added a nice wrinkle - the SWR indicater employs TWO leds, not the normally seen single red LED. Youkits MT1 QRP Long Wire Antenna Tuner. diminutive magnetic loop antenna can really perform in practice compared with large traditional HF antennas.