Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW - Balun Designs JC[ d8O[UKKQ{yZ{G 'Upno_*~8uo a@G`' zxUHXW&`}mEp`?i0 oE:N0-/t"t.-? Performance is ASTOUNDING, far exceeding my expectations. Here Is a 250 Watt Home-Brew That I Made In about an Hour. (Note: I am not satisfied with this part of the project, so I will describe it here briefly. You can add your own wire or get the complete product from this link EFLW-3K antennas. I used a homemade jig made of an SO239 chassis mount to bare wires, alligator clips, and a coax-jumper with PL259 (UHF male) ends; see picture below. If you plan on stringing up a dipole you use 2 equal lengths of wire with the Balun in the middle. understand its properties. Antenna Design The kit includes the parts needed to construct a 49:1 impedance matching network, which will transform the impedance to 50 Ohms, which will suit most transceivers. Reading Room Here's a list of recommended lengths of wire to use with a 9:1 unun. Moving the pot up and down gives a feel for the SWR versus antenna impedance sensitivity. /Filter [ /FlateDecode ] x 4 in. End fed 49:1 60ft wire (using coax as the counter poise. I made just a touch over 100 QSOs today with the new unit. Drill a hole in the top for an eyehook (to be used to secure the unun to whatever it is you want to hang it from.). endobj STORE Links Enclosure Height: 5.000 in. I used the RigExpert Zoom AA-55 to test VSWR of the 49:1 unun impedance transformer. << x[q;`&z`uAlo#V@;hvOYt, @*Ys~_W_~W_aw_ p[N+}[t-^oLy}xz>7/~c|ZZt75;kN^=>Y+_~|b~"m*tw>xG=x6Qwz|xvz- 9:1 UnUn End Fed Long Wire Lengths - Pretty Simple | ve3ips The 9:1 may work best with that length wire and a tuner, but some say that length is undesirable for the hf HAM bands. The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built orbought, running the feedline, and all the rest that goes with putting up a more elaborate antenna. endobj I connected the free twisted end of the short and long wires (the ground) the chassis wire (ground) of my homemade testing jig with alligator clip. Turns 1 through 14 are secondary windings (the long wire). End Fed 9:1 Magic Wire Lengths | ve3ips "Here's the word on random-wire antennae.". This is considered a random wire end fed antenna, not to be confused with a half wave end fed antenna which uses a 49:1 or 64:1 unun and a wire that is a half wave length. &nb /Width 748 EFHW unun Resonant Long Wire 49:1 Transformer With BNC or SO-239 Clansman End Fed Long Wire Antenna Used. The short piece is for the primary winding of the transformer, and the long piece is for the secondary winding of the transformer. The WorldwideDX Radio Forum was originally established in 2001. 73. JACK, VE3EED Super Bullet Features: - Uses proprietary broadband impedance transformer design for maximum bandwidth with SWR < 2 from 1.8-61 MHz for 1500 Watt model and 1.8-30 MHz for 3000 watt model PDF portable multi-band End-Fed Half Wave (EFHW) antenna for 40-10m Connect this ring terminal to one of the SO239 chassis bolts. You will note that when comparing my results with VE3EED that some of the results are a bit different. Odds are that most lengths are fine though, so the easiest solution is to pick a length based on something else (like, the room you have available) and if you get unlucky, roll the dice again. good show chuck, you said ya picked up a 430, did i tell i fried the 0ne i got from you, can anyone point me in the direction of a 2 pill schem for the HG 2879? In the first year using this unun with a random length endfed wire (Aluminum Elec fence wire at that) I managed to confirm WAS via LoTW on 10m, 15, 17, 20, 30, 40, 80. . and leave the unun on the ground. Two pieces of 14 gauge enameled wire (e.g., Thermalese), one short piece (about 1 foot in length) and one long piece (about 7 feet in length). often can't match it. That meant calculating all the way to 32 multiples of a half wave on 10 meters. Vhf and Up There are so many new frequencies to stay away from, that it gets pretty tricky for the longer wires. Experimenting with 1:64 and 1:49 end-fed antenna Ununs on - reddit << The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. This is a followup video to #344 where I assembled the 49:1 UNUN kit from HF-Kits / ARRL. /Creator (XnView) but instead of the Jaycar core, we used an Amidon FT-240-43; anyhow, we also followed the UnUn with a 1:1 guanella choke and boxed everything, at that point, we . /ColorSpace 11 0 R Midi Music Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. Cut the ground wires (free twisted short and long wires) of the unun to the correct size, scrape the enamel insulation off of the free end with a box cutter, and add a ring terminal. I have not done this yet. I say run what you got and don't worry about it. This is the latest and greatest transformer design for End Fed Half Wave (EFHW) antennas. An end fed antenna consists of a wire fed on its end, the length of that wire is not resonant with any frequency or frequencies you will be using it on. "I received my third balun from Balun Designs this afternoon. Weight: 0.380 lbs. nelson_antennas | eBay Stores We do not encourage any radio operations contrary to regulations. UJM-49-1 $56.99 Save up to 6% when you buy more. If the choices are. this Designed for those who want the maximum isolation and choking across the full HF spectrum. plan to use. 3 0 obj Coverutilizes integralneoprene gasket for weatherproof integrity. /XObject << /Im0 9 0 R >> /Im0 Do They just saved you and I loads of time and frustration. I plotted the results for the U.S. CW band edges for use with my4 band Elecraft K1 qrp rig. results. is helpful if you're in a hurry to get on the air, read up on the topic The counterpoise wire, This transformer is designed to be used with an end fed, Approx. In addition to multiples, 3 0 obj 35-43, 49-63, 70-85. well, the main antenna wire goes to the 9:1 UnUn "+" connector, the vertical counterpoise (insulated !) var sc_invisible=1; It is optimized for 3.5/7/10/14 MHz but will work reasonably well on all amateur bands from 80 meters thru 10 meters with a 135 foot length of wire and a short connection to ground. endobj Usually any wire length that is non resonant on the band or bands desired will work with the 4:1 ratio. We are working every day to make sure our community is the best Radio Hobbyist's site. Be sure to review the various lengths in the link below to obtain the lowest SWR across most if not all HF bands. unavailable, a random wire can save the day, but it is important to Ham Radio Videos! In other 9:1 Unun 1.5-54MHz 2kW 9132S - The DX Shop Limited 1 0 obj /Type /Catalog BUILD INSTRUCTIONS FOR 49:1 UNUN IMPEDEDENCE TRANSFORMER: WX1MAR and I brought the DIY 49:1 unun with a borrowed antenna radiator wire cut for 20M half-wavelength to Ashland State Park K-2417 in Massachusetts for a Parks-on-the-Air (POTA) activation. A good place to start is the formula 468 / f (MHz) for a 1/2 wavelength wire antenna. This transformer is designed to be used with an end fed half wavelength of wire only. This is not exactly a 1/2 wavelength in free space, but works for wire as it has a different velocity factor than "air". Just an FYI that I thought you might be interested in. Here are the final numbers (in my opinion) in green below that would be good for a long-wire antenna: (You may want to make a note of them), REVISED: 29 35.5 41 58 71 84 107 119 148 203 347 407 423, REVISION NOTE: We had a note from James, KB5YN, pointing out that one of my so-called GOOD numbers was 220 feet. So I just wanna say thank-you!! Jack, VE3EED, used center frequencies of thebands described in the article above, and I thought it would be nice to use band edges. HF & Shortwave "The Simple Build" 64:1 EFHW antenna transformer (UnUn) SO-239 connectors are silver plated with Teflon insulation. Palomar Engineers employs a dual core matching system that offers wide bandwidth (1-61 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired. 40-30-20 . Meet 'Balun One Nine', a small, cost-effective balun. This will be for an eyehook in order to provide strain relief for the radiator wire. <> config file by typing gnuplot rw.gnu. The trick, therefore, is either Ham Radio End Fed Antenna with a 1:64 Matching Network /Resources << Turns 1 & 2 are primary windings (the short wire). We have also installed an additionalstud which can be used for a separate counterpoise wire rather than forcing the use of the feedline's coax shield. Let the now free end of the short wire hang down from the toroid. It will be good for 15m, and 10m. An excellent way to attach a long wire antenna to the Ham It Up, this 1:9 balun has an SMA output port and high-quality spring-type terminal block input for your coax. This article details the construction of the transformer. This is to avoid the antenna radiator from acting like a resistor, and thus instead of radiating radiofrequency energy produced by the transmitter, sending it back down the coax toward the transmitter. /Type /XObject I'm not saying aliens are in the radio, but aliens definitely are in the radio. installed, it is a compromise antenna but great for portable use because At multiples of half wavelengths of the a more capable tuner - see AA5TB's He knew that in order for the tuner to "see" a fairly low swr to work within it's range,that the antenna had to be NOT A HALF WAVE ON ANY FREQUENCY that we wanted to us, because a half wave will give us a very high impedance and the resultingswr into a 50 ohm transmitter! endobj Update guys:made the unun,the antenna was extended to about 37m length,and I added a counterpoise which is about 10m.The whole thing is much higher in the air,compared to where it was before. Computer Help . The beauty of the halfwave antenna is it's a complete antenna in the sense it needs no counterpoise. 2 0 obj Prescott Hamfest - W7YRC 7 0 obj So for example 80m could range in length from 120 to 133 feet. In total 29 contacts were made from British Columbia to Texas to Florida in 40 minutes on 20M. The 49:1 End Fed Half Wave Antenna is very popular choice for home & field use, Ideal for limited space and stealth applications. Lowest Band of Operation: 160 meters Highest Band of Operation: 10 meters Additional Information LDG Electronics RU-9:1 Unun It may not display this or other websites correctly. It uses an FT140-43 or FT240-43 toroid in a 49:1 impedance matching unit at the base and a 110 micro Henry (H) coil to act as a loading coil for 80m and a choke to stop higher frequencies using the last 2m of wire. % Mike ab3ap, Editors note: Many thanks to Jack, VE3EDD (SK)and Mike, AB3APfor sharing their math and computerskills with us. /ProcSet 7 0 R >> A small ring terminal for 14ga wire that fits these screws would be helpful too. The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. % Simple End Fed Half Wave for 40m (and how it works) I've made contact with several folks across North America in my 6 months as an amateur but getting to Europe flipped a switch and I'm afraid this amateur radio thing is going to be addicting. These dimensions were derived from modelling the antenna in EZNEC. Electronics I have never tried to transmit through it, but it proved the optimal ratio for receiving with my setup. Well then you need to choose a wire length that is at least 1/4 on 40 meters, and doesn't fall on any of the 1/2 multiples for ALL the bands between 40 to 10 meters While you could certainly calculate the lengths to avoid using the standard formulas, and then make a chart, the section below may be what you are looking for. 2. bands you're intested in in a vector like the example below, by typing. Contact 1. Hi guys,not really hfu related,but I tought I might ask here as I have my account. Lengths of a half-wave or multiple must be avoided. I'll get a 9:1 unun,and use a suggested random wire length to avoid half-wave and it's multiples then,that sounds like the best things I can get out of this setup. /Type /Pages 35. %PDF-1.5 75/80 METER RESONATOR KIT FOR THE UJM-EFHW-40-10 200W 40-10m ANTENNA multiples, and of course different band combinations yield different So those are the numbers above thatwe have to stay as far away from as possible when building a long-wire antenna. q Box cutter (for scraping enamel off of wire ends), (Helpful) Step drill bit for SO-239 connector, Paracord (for simulating and measuring lengths of windings on toroid), Antenna analyzer for HF frequencies (I use the RigExpert Zoom AA-55), Resistor(s) totaling about 3000 ohms (I used 1K and 2K ohm resistors in series). endobj endobj You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. In fact, the 9:1 unun that I built is actually an autotransformer. /Title (Wire-Lengths-for-9-1-ununs.pdf) hbbd```b``^ "Cs;D2 I*`0D;+EVUHy`qml0{YVw`b0i DvkAh |"w I2% ?W%@Fg`` 6 At this point, Ive only used the 49:1 tap, but plan to take the 64131 whenever I operate portable. End Fed Antennas - Elgin Amateur Radio Society Even better would be shortening to 53'. 1:64 vs 1:49 balun for an end fed?? : r/amateurradio - reddit Many hams have tried till they are blue in the face to install the random wire antenna that works on most; if not all of the HF bands with terrible results. End Fed Long Wire Antennas - Palomar Engineers /Subtype /Image You also This project assembles a 49:1 ferrite-core ("FT") type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. Hope it's clear now, if not. My homemade 49:1 EFWH with a 60 wire (cut for 40M) would do just fine! . A Balun is used to match a balanced line to an unbalanced line. /Pages 3 0 R Experimenting by slightly changing the wire length (+ or-) is encouraged to provide best overall performance. PDF shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m This homebrew 49:1 impedance transformer is the heart of any EFHW antenna you will build, most of the time. want the antenna to be at least 1/4 wavelength long for each band you , Reprinted with permission of Hamuniverse, this is an excellent explanation of SWR and how to best me You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose. Each vertical blue line represents an amateur radio band. EFHW unun Resonant Long Wire 49:1 Transformer With 67' Antenna Wire. The novel thing was that I only built it the day before and it uses a Coghlan camping washing line spool with the string taken off and about 21m of wire wound onto it. If you want all the bands from Humor endobj https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. The most important length is one that is non-resonant on any band. Hertz Antenna" shows in line 2 of the table that a similarly installed so that it is not a halfwave multiple of any frequency you want to use. Just add or subtract as needed a little at a time to get the best compromise. the C code, in Matlab or Octave get a plot by simply putting the The 49:1, shown in my previous message, is meant for the EFHW that are fed close to or on the half wave (highest impedance) point. /Length 10 0 R 1 bolt for antenna hook up (with nuts, washers, lock washers, and possibly thumb screw; I used #8 diameter, about an inch or so in length.). uR5ucE`_aksLjYT=hzRa]JucX7d}|'}`XRa>X End Fed Half Wave Antenna Coupler (EFHW) - M0UKD . google_ad_client = "ca-pub-9377297764300878"; However, the list has been revised and is good for wires as long as 500 feet. Code Practice W3EDP's results in the above referenced For example, Again, the bands are USA, so change them Well, I didn't think it would make any difference at that many multiples. Wire Lengths For 9-1 Ununs | PDF | Electricity - Scribd these are the worst lengths and you want to be as far from colored Step 1: Drill holes for and install the SO-239 or BNC connector, the stainless steel machine screw antenna connector and the ss machine screw ground connector. Drill out holes in the designated bottom of the electrical junction box for the SO239 chassis mount. 0$Ve The bandwidth where SWR was below 2:1 was about one MHz. 3 to31 MHz - up to 1kW intermittent (50% duty cycle). Our Ask An Elmer panel discuss this question - what's the difference between matching units?Please consider using. End Fed Half Wave Wire Antennas | N6CC PDF Wire-Lengths-for-9-1-ununs - OM0ET A few more comments about this 49:1 autotransformer EFHW design. Stacked coreswithwinding configured as 49:1auto transformer. I have found this calculation to work well, however it depends on many factors such as wire used, location etc. //-->, The "Best" Random Wire Antenna Lengths Prescott Hamfest 2023 Saturday - May 13, 2023 - 0800 to 1200 MST Granville Elementary School 5250 Stover Drive, Prescott Valley, AZ 86314 The 2023 Prescott Hamfest is co-sponsored by the Yavapai Amateur Radio Club (YARC) and the Amateur Radio Council of Arizona (ARCA). 33 ft #18 insulated copper wire (20m half wave), Counterpoise: 1 meter coax (0.05 x wavelength) connected between 64131 and Balun Designs 1115d Isolation /Choking balun, If you would like to use high power up to legal limit with a single end fed wire antenna (not necessarily a half wave) consider using our. In stock . NOTE: Rewording the previous paragraph, if you have a capable enough Drill another hole in the same side as the antenna radiator wire mount hole. x@ 9:1 Unun EF Random Long wire matching Transformer with BNC or SO-239. Proudly powered by WordPress Recommended wire lengths for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. /Type /Page Therefore, we came up with the following numbers to avoid (IN FEET): These lengths in the table beloware the culprits that cause all of the trouble when using random lengths. Single Wire/End Fed Antenna - K7MEM The QRP End-Fed Half-Wave Antenna 49:1 Transformer Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. Twist the short and long wires together starting at an end of each wire. END FED "RANDOM WIRE" HF DIPOLE 9:1 ANTENNA RELACEMENT ELEMENT ONLY $28.99 Save up to 6% when you buy more. I connected the free untwisted end of the short wire to the center conductor of my homemade testing jig (see tools list) with an alligator clip. 4 0 obj So, having nothing better to do one day, I re-did the calculations going out to 500 feet. FCC Information This unit is a Balun Designs, in collaboration with Fair Rite products, has developed what we consider to be the best single core 1:1 feedline isolation balun available today. You have to stay away from a half wavelength on any frequency. google_ad_width = 160; The length should be calculated based on the lowest frequency to be worked. . used by hams for dipole lengths. Notice from column f that there is no length giving low impendance for You'll want to have that wire up as high as you can get.. >> So for example 80m could range in length from 120 to 133 feet. You can get good loading and low swr on sometimes 2 or 3 bands, but one or more of the bands thatyou want, just will not cooperate with an swr that can be adjusted with the "tuner". Even easier than This was 9m vertically metres up a fishing pole and then about 5.8m out. End Fed Half Wave Antennas - Elgin Amateur Radio Society The fewer bands, the fewer high impedance regions to avoid. Wire-Lengths-for-9-1-ununs.pdf Created Date: 12/12/2022 11:20:42 AM . 5 0 obj Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50 (unbalanced) coaxial input, hence UnUn. I usually go with a 3.2k transformation wire winding ratio of 8:1 which is a final impedance conversion of 64:1 (50ohm * 64 = 3.2k ohm). Gil Gruson 1 Campaign | Comines, France $0 USD 0 backers 0% of $3,450 Flexible Goal Follow Story FAQ Updates 0 Comments 0 Prototype The project team has a working demo, not the final product. Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. Home-brew End-Fed 49:1 UnUn. - KA9QJG Repeaters << (Also note that here may be instances where the suggested lengths may not work exactly due tothe many variablesin the surroundings of the antenna, wire length variances,your tuner, it's height above ground, it's construction,etc. So, if you connect a length of wire that presents an impedance of about 450 to the input, you'll get an impedance of about 50 on the output. 40-30-20-17. hb```YloD@(aKI V!}g@~}%Q/[[~_=Wy-:O)x[~hs/~SGeG _QE C6q %r The major point of this message is to tell you that approximately 20 minutes after I connected the balun unit to the antenna, I made contact with a gentleman in Italy-my first European contact!! An UNUN is needed to match the high impedance of an end fed antenna (2k-4k ohms range). Usually any wire length that is non resonant, like those shown above, will work with the 4:1 ratio. <> << Shortwave Listening << /Height 752 Care to buy us a beer? For instance, to work 40m be sure the antenna is at least For calculating the length of a half wave in metres, I use 141 (MHz) for wire elements. Y &lD30. SSTV Windings are inserted into Teflon tubes increasingtotal breakdown to 10,000 volts. Picture 1 of 9. doing the initial 468/f on C and D scales. is that for a given ham band there are min and max frequencies which 49:1 Impedance Transformer for EFHW Antenna - DX Explorer It is used fornon-resonant verticals like 43 foot or 33 foot Or Wire antennas like an End-Fed1/2 Wave Multiple Length Wire Antenna. About Batteries 748 0 0 752 0 0 cm endobj >> Generally an EFHW will be in the range of 2,000 to 5,000 ohms at the very end of the dipole when resonant. (Center fed is so appealing because you avoid this.). Legal Stuff 74 0 obj <>stream thank you. While I have not done so yet, I plan on gluing the test cap to the back of the junction box. The 49:1 unun with 3000 ohms of resistance shows a VSWR under 10:1 from 160M to 15M, and less than 3:1 from 80M to 20M. Longer wire is always more A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. It is used for non-resonant verticals like 43 foot or 33 foot Or Wire antennas like an End-Fed 1/2 Wave Multiple Length Wire Antenna. It is not a good choice for working lower bands from a too short wire, that is, if you have cut your wire to a 20m halfwave, it ain't much punkin' for 40m, 80m, or 160m. In theory, my LDG Z100 Plus autotuner should be capable of matching the impedance of this 49:1 transformer with a end-fed half wave length antenna radiator across all amateur HF bands. JavaScript is disabled. Start winding the Matching Auto Transformer, each pass through the center of the core equals one turn. V#X~[Z?\ZcX:-Y?&Y?IqTnayZ{jTZOub}=UTWu1G>o.,RaT c=W>:sECXTkc=X Thank you so much for such a great product! stream The table below represents half wave lengths and multiples that you DO NOT WANT TO USE! There probably should be some holes for ventilation. bands as possible. I actually did this first and before the connector was bolted to the box. We'd really appreciate it! SWR was good after cutting the wire to appropriate length. K1S Valentines Are (Almost) Out The Door! Designed for use with single wire unbalanced antennas, this new addition is small, compact and perfect for quick portable/emergency installations. Technical specification : Type : 49:1 Unun Frequency : 1.8 MHz - 7.3 MHz Turns ratio: 1:7 Impedance ratio: 1:49 Input Impedance: 50 Output Impedance: 2450 Power Handling (CW/SSB/ Digital Modes) : 2Kw of peak power / DM Modes 500 watts Core Type : 3 x FT240-43 by Fair-rite Co. Wire type: Enamel copper wire 2.0 mm (AWG 12) Assembled and tested. 1 X FT240-43 Ferrite Toroid Core 43 Material(Mouser Electronics), 1 X SO-239 UHF PANEL JACK S/CUP SO-239(Mouser Electronics), No. Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. 9:1 Magnetic Longwire Balun / Unun - M0UKD - Amateur Radio Blog ), Note that Jack, VE3EED,went SK several years agohe will be missed. Any SWR measurement taken with the transformer at the feedpoint should not exceed 1.5:1withNOtuner in use. The other is to provide strain relief for the antenna wire). One is for the top of the box so that it can be hung up. Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth. A level of 500-600 watts is the maximum with a further reduction onany band measuringabove 3:1. The graph below shows lengths to avoid for different collections of bands. Unun 9:1 - VK6YSF - Home Page Tune Around! Solder a the 100pF capacitor between the center conductor wire and ground wires. var sc_security="1df091cc". all US ham bands. Note: My (A to B) length was 6 inches. /BitsPerComponent 8 endstream InJack's own words. The fewer bands, the fewer high impedance regions to avoid. The popular End-Fed Half-Wave (EFHW) Antenna is an easily portable, high-impedance (2,000-4,000 ohm) wire antenna that resonates on its fundamental frequency and all harmonics above. endobj Power Handling (CW/SSB): 100 W/200 W Enclosure Width: 2.500 in. j#f5(fk0?P[polEo5b2-/oVZu1Qo-I6C/M@TbddPc#cdZZ|7+|o{}!F#?Go7ju|?wwgow/c2/W-m~~hn[S29OU}}r7lc]wsw[shS[#qbrrK[7*0,Xv{k+o {=*vo S__O~*=y/zk75O?yjCnXS{`~Ii'c_GxN. /ModDate (D:20221212112042) Swr usually is all over the place and the tuner will just not do it's job. I sent him the link to the 49:1 unit to get his feedback. =======================, More on Random Wire Lengths from Mike, AB3AP (06-29-2012), I was surfing around Hamuniverse.com and found thIs page on random wire antennas: Quantity: Sold individually. Q 4 0 obj recommended on VE3EED's page because I use all halfwave This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line. 32.00. When used with the stated lengths shown in thetable below, the 9:1 ratio will Based on the success of our model 4932, this 5kWconfigurationisalso perfect for matching both long and short length wire antennas for multiband use. Built with the same craftsmanship as all our other units, this new model will allow you to either replace your current matching unit or construct a new higher powerend fed half wave antenna. The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose.
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