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/Creator (XnView) REVISED: 16 19 22 26 32 33 38 44 46 48 52 64 65 66 76 78 80 88 92 95 96 99 104 110 112 114 123 128 130 132 133 138 144 152 154 156 160 165 171 176 182 184 190 192 195 198 208 209 220 224 228 230 231 234 240 242 246 247 256 260 264 266 272 276 285 286 288 297 304 308 312 320 322 323 325 330 336 338 342 352 361 363 364 366 368 369 374 380 384 390 396 399 400 414 416 418 429 432 437 440 442 448 455 456 460 462 464 468 475 480 484 494 495 496. 2. HF Underground wiki Radio Hobbyist technical blogHFU Discord EuroPirate ChatPropagation DataTeamspeak Server, TDK CXA-2090 LCD Inverter Module New Old Stock USA Seller $19.99, Shortwave Pirate Radio In North America And Around The World, And Other Signals That Go Bump In The Night, Login with username, password and session length. /MediaBox [0 0 748 752] Free Postage. the C code, in Matlab or Octave get a plot by simply putting the Clansman End Fed Long Wire Antenna Used. A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. 3 0 obj Do what works best! high the other 1.5m (4.5feet). End Fed Half Wave Antenna Coupler Schematic - 7-30MHz. Scott builds a compact random wire antenna with 9:1 Unun /Name /Im0 Moving the pot up and down gives a feel for the SWR versus antenna impedance sensitivity. answers on D - one setting. Multi-band end-fed - Nonstop Systems First, it is important to understand the difference between the end fed half wave and a random wire (or "long wire") antenna: the random wire is just a piece of wire that is matched to 50 Ohm impedance using an antenna coupler, sometimes adding a 9:1 unun. This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line. Y &lD30. , Most matching problems occur when the antenna system Power handling is 100 watts CW / SSB & 25W Data modes. Advertising Info Here Is a 250 Watt Home-Brew That I Made In about an Hour. In other DIY 49:1 Unun Impedance Transformer For End-Fed Half Wave (EFWH Continue twisting the entire length of the short wire. /Type /Page Just add or subtract as needed a little at a time toget the best compromise. 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. The bandwidth where SWR was below 2:1 was about one MHz. Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500/3000 Watts, End Fed Long I'm looking forward to getting off work and hitting 40 & 20 meters again!! the program as I did, above, for my K1. . hbbd```b``^ "Cs;D2 I*`0D;+EVUHy`qml0{YVw`b0i DvkAh |"w I2% ?W%@Fg`` 6 For instance, to work 40m be sure the antenna is at least 10m or 33' long. % He had heard good things about 'Balun Designs' so he recommended you. I have included a screenshot showing the stations that reported spotting my 200 mw beacon over the last 16 hours. Performance is ASTOUNDING, far exceeding my expectations. >> 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. 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. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. End Fed Half Wave Antenna Coupler (EFHW) - M0UKD Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth. The length should be calculated based on the lowest frequency to be worked. 1863 1.49 swr 3915 2.50 7200 1.80 14.332 1.29 18.130 1.07 21.300 1.40 24.950 1.30 28.400 1.37 This is a great antenna that is . /Contents 5 0 R This was 9m vertically metres up a fishing pole and then about 5.8m out. That is the 10th multiple of a half wave on 15 meters. As an example, a 28-31 foot wire will typically allow 40 thru 10 meter coverage and a 43-50 foot wire will provide access to 80 thru 10 meters. All you need for a random wire antenna is some wire, your tuner, one or more supports up as high as you can get them to string the wire from the supports to the tuner, at least one or two insulatorsand a little time. The Nelson antenna 9 to 1 unun did the trick. There are numerous configurations available online that will accomplish this on multiple bands (Google search "end fed half wave antennas"). The First Thing New Hams Often Ask:What Is An UnUn? Contact Just add or subtract as needed a little at a time to get the best compromise. 748 0 0 752 0 0 cm These are sometimes known as a Magnetic Longwire Balun. used by hams for dipole lengths. If you want all the bands from Continue on winding the long wire through the toroid to complete loops 3 through 14 as shown in the schematic below. How We Flew An End-Fed Half Wave (EFHW) Ham Radio Antenna On A - KM1NDY Both were on 20 meters at 97 watts, Icom 7300. You'll want to have that wire up as high as you can get.. 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.). The unun was floating at about 15 feet above ground. The WorldwideDX Radio Forum was originally established in 2001. >> The Short Answer Would Be That an UnUn Is a UN balanced to UN balancedmatching transformer. In fact, the 9:1 unun that I built is actually an autotransformer. Single Wire/End Fed Antenna - K7MEM 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. >> End Fed Half Wave Antennas - Elgin Amateur Radio Society it is easy to pack and easy to install. endobj The second smallest number I measured was 2.7pF, derived from the self resonance at 2.72 MHz with the magnetizing inductance (measured at 25.8 H) with the secondary open and the output wire folded to a small 1/2 length. frequencies for your country or favorite modes. When on the trail, at Field Day, or whenever a good antenna is Prescott Hamfest - W7YRC unavailable, a random wire can save the day, but it is important to 1 0 obj 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. The most important length is one that is non-resonant on any band. endobj Repeater Basics V#X~[Z?\ZcX:-Y?&Y?IqTnayZ{jTZOub}=UTWu1G>o.,RaT c=W>:sECXTkc=X 7 0 obj He used 300 ohm twin-lead and a 4:1 UNUN, with a 1:1 current choke between the UNUN and the coax to the tuner and transceiver: The full-size "flimsy" (ref. Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. Here's a list of recommended lengths of wire to use with a 9:1 unun. The transformer usually used with an end fed wire is a 9:1 transformer. As typically <> doing the initial 468/f on C and D scales. wire is at least 1/4 wavelength. . 49:1 UNUN Transformer 2 Kw 160 - 40 m - Wire Antennas 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. For best results, use the Wire Length Feet 1.8 MHz 3.7 MHz 5.3 MHz 7.1 MHz 10.1 MHz 14.2 MHz 18.1 MHz 21.2 MHz 24.9 MHz 28.5 MHz 50.1 MHz 2 0 obj N4UJW. IMG_2.jpg Step 2: Take the 6 feet of 18 gauge enameled copper wire, measure 11" from one end and fold it back. 4 0 obj Vhf and Up Best SWR was . That meant calculating all the way to 32 multiples of a half wave on 10 meters. something as high as you can find. Quantity: Sold individually. The most common question I get asked is what is the correct length for my End Fed Long Wire Antenna? hb```YloD@(aKI V!}g@~}%Q/[[~_=Wy-:O)x[~hs/~SGeG _QE C6q %r Presented for your consideration by Jack, VE3EED. this So for example 80m could range in length from 120 to 133 feet. thank you. program or two to do all the dirty work. Lowest Band of Operation: 160 meters Highest Band of Operation: 10 meters Additional Information LDG Electronics RU-9:1 Unun So is an essential piece of gear to have. //-->, The "Best" Random Wire Antenna Lengths I say run what you got and don't worry about it. When you're 1/2w long you're around 2k ohms or more where the balun won't under or over xform; as you approach 3/4w your z is going to drop to where a coax match can be made just by soldering the wire to the center conductor sans balun - more or less the principle of the windom and ocf dipole. q ?7{*. Drill a hole in one side for the antenna radiator wire mount (for a #8 bolt in my build). I used the RigExpert Zoom AA-55 to test VSWR of the 49:1 unun impedance transformer. Theme: Newsup by Themeansar. The length of enamelled copper wire per winding for the T-200-2 powdered iron toroid core is determined by length per winding = 50mm per turn plus 250mm tails. config file by typing gnuplot rw.gnu. Shortwave Listening A way of connecting the analyzer to the transformer. Start winding the toroid with the twisted wires at loop #1 (see schematic below). Recommended wire lengths for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. Alternate connectors and Mounting Options are available in the. EFHW unun Resonant Long Wire 49:1 Transformer With BNC or SO-239 49:1 Impedance Transformer for EFHW Antenna - DX Explorer I sent him the link to the 49:1 unit to get his feedback. 9:1 UnUn End Fed Long Wire Lengths - Pretty Simple | ve3ips 10m or 33' long. /Height 752 Use with other lengths can potentially damage the transformer depending on power level in use. 49:1 EFHW Antenna 40-10M 100W - M1ECC-Antennas Technical specification : Type : 49:1 Unun Frequency : 1.81 MHz - 30MHz Impedance ratio: 1:49 Input Impedance: 50 Output Impedance: 2500 Power Handling (CW/SSB) : 250W Core Type : 1x FT240-43 by Fair-rite Co. Capacitor 100pF 3KV Assembled and tested. Random wire lengths you should and should not use! Designed for those who want the maximum isolation and choking across the full HF spectrum. When used with the stated Balun Designsis now offering a low power alternative for those who want to use an End Fed Half Wave for portable or temporary installations. plan to use. 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 . For calculating the length of a half wave in metres, I use 141 (MHz) for wire elements. << Part List: Twist the short and long wires together starting at an end of each wire. SWR will vary based on topography, wire orientation and use of ground or counterpoise. The length of a half wave antenna is calculated using the following formula: L (ft) = 468 / f (freq in mhz). 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. Suggested wire lengths for 1-61 MHz operation (measured from Bullet wire point): Bands Covered (meters) Wire Length (feet) Minimum Coax Length (feet) 40-30-20-15. One is for the top of the box so that it can be hung up. FCC Information A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. Even better would be shortening to 53'. PDF 33ft Verticals and 4:1 Ununs - G8JNJ Caution: When used atfull power rating of 1kW, the antenna must have a low SWRon the band selected and be used on a 50% duty cycle. Links Thanks for your answer,I will probably go with the 9:1 then. Simple End Fed Half Wave for 40m (and how it works) 9 0 obj The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. This homebrew 49:1 impedance transformer is the heart of any EFHW antenna you will build, most of the time. I purchased a MFJ-16010 Random Wire Tuner and an LDG RU 1:1 unun. The idea 2 0 obj 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. 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. random wire page. Stacked coreswithwinding configured as 49:1auto transformer. This article details the construction of the transformer. 49:1 vs. 9:1 Transformer for RX only? - RadioReference.com Forums Privacy Policy Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. endobj A success! The QRP End-Fed Half-Wave Antenna 49:1 Transformer 3 0 obj Site Map 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. END FED "RANDOM WIRE" HF DIPOLE 9:1 ANTENNA RELACEMENT ELEMENT ONLY $28.99 Save up to 6% when you buy more. 2 eyehooks with washers and nuts (I used #8 diameter, but size is up to you.) so that it is not a halfwave multiple of any frequency you want to use. Care to buy us a beer? /Filter [ /FlateDecode ] End Fed Long Wire Antennas - Palomar Engineers Ham Radio End Fed Antenna with a 1:64 Matching Network A couple hours later when I sat down to do some more DXing, I made contact with a gentleman in Slovenia-my second European contact. Drill another hole in the same side as the antenna radiator wire mount hole. Usually any wire length that is non resonant, like those shown above, will work with the 4:1 ratio. google_ad_width = 160; You are using an out of date browser. Here is an ARRL End Fed Half Wave Wire Antennas | N6CC I made just a touch over 100 QSOs today with the new unit. rig, often with no feedline, and the other end in the air attached to endobj I have found this calculation to work well, however it depends on many factors such as wire used, location etc. Having the option to switch rapidly between 49:1 and 64:1 should prove to be a really nice feature.. However, the radio didn't tune up very well on 15 meters. 32.00. 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. The graph below shows lengths to avoid for different collections of bands. %%EOF /Kids [ 4 0 R ] CQ-Calling All Hams! presents an extremely high impedance to the tu Drill out holes in the designated bottom of the electrical junction box for the SO239 chassis mount. See the picture below. Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. excellent page for EFHW info - or, addressed below, to cut the wire here are values for CW portions of the USA I connected it to a 33 wire running from my balcony, through the trees, and ran WSPR overnight to check things out. Yes, with the recent surge in popularity of the end-fed half-wave antenna, the 49:1 balun has also become the defacto ratio for use with them. Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. Lengths of a half-wave or multiple must be avoided. Here Is a 250 Watt Home-Brew That I Made In about an Hour. InJack's own words. 5 0 obj u?X`f0&/Ri;W0Tn_*TX:ug 4 x 4 x 2 electrical junction box (available at big box hardware stores), One PVC DWV Test Cap (available at big box hardware stores in plumbing). This transformer is designed to be used with an end fed half wavelength of wire only. 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. Because I had some spare Cu-Wire I wound another 1:49 Unun on a smaller FT-140-43 toroid and tried different capacitors between feedline and ground (to compensate for the 10m band). Par EF 20 and par EF 40 (I realize for 17m I would prob just add that band to a 49:1 balun) That's that my question is. =======================, 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: Upon further research, I remade it tightly twisting those two separate wires together, just as it shows in archjeb's picture, and it worked surprisingly well. A so-called random wire antenna is an end fed antenna. Wait a few minutes for glue to set. 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. Because I'm more visually oriented I then plotted the many overlapping "red zones" and ended up with the page at: Meet 'Balun One Nine', a small, cost-effective balun. wire lengths less than 1/4 wavelength of the lowest desired frequency Some important and helpful references I used for this work: https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. You also #347: Quick test of the 40m Halfwave End-Fed antenna using a 49:1 want the antenna to be at least 1/4 wavelength long for each band you uR5ucE`_aksLjYT=hzRa]JucX7d}|'}`XRa>X What Is an End-Fed Half-Wave (EFHW) Antenna? - OnAllBands You can add your own wire or get the complete product from this link EFLW-3K antennas. endobj The QRP End-Fed Half-Wave Antenna 49:1 Transformer Building a great impedance transformer for Ham Radio end-fed wire antennas. /ProcSet 7 0 R >> Jack, VE3EED, used center frequencies of thebands described in the article above, and I thought it would be nice to use band edges. endobj SO-239 connectors are silver plated with Teflon insulation. Superior Essex Heavy build polyamideimide. I have never tried to transmit through it, but it proved the optimal ratio for receiving with my setup. PVC Junction Box(Home Depot), 1 x 1/2 in. Building on the original 1:1 design by Dr. Jerry Sevick, this balun has two (2) cores in a stacked Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW, Decrease Quantity of Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW, Increase Quantity of Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW. I will also find some sort of heat resistant packing material to help hold the transformer in place. The fewer bands, the fewer high impedance regions to avoid. At multiples of half wavelengths of the (Center fed is so appealing because you avoid this.). Nelson Antennas 9:1 balun - eHam.net Computer Help 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. bands you're intested in in a vector like the example below, by typing. A level of 500-600 watts is the maximum with a further reduction onany band measuringabove 3:1. "Just received my new 64131 yesterday and was anxious to see how well it performed. 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 key is you want to stay at least 1/2w long but not near 3/4w for any band of interest. About Hamuniverse This undesired reflection of RF power back toward the transceiver is identified as a high voltage standing wave ratio (VSWR or SWR). << Please note that I will not be describing the construction of the antenna wire radiator here. endobj The 49:1 End Fed Half Wave Antenna is very popular choice for home & field use, Ideal for limited space and stealth applications. uR5I5z G^u2`j[}+sy9 Designed for use with single wire unbalanced antennas, this new addition is small, compact and perfect for quick portable/emergency installations. endobj 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. Dimensional Drawing of Standard Enclosure, 1:1 Common Mode Choke / Noise Suppression, Core Material Selecton for Baluns and Ununs, Antenna Matching Problems When Using Ladder Line or Open Wire Feedlines, Model 4932 - 4 & 9:1 Unun 1.5 - 54MHz - 2kW, Model 49130 - 49:1 - 80-10m EFHW - 200 watts, Model 64131e - 64:1 & 49:1 - 80-10m EFHW - Up to 1kW, Model 4116 - 4:1 Hybrid Balun 1.5 - 54MHz 3kW, Model 9130sw - QRP 9:1 Unun 1.5 - 54 MHz - 300 watts, Model 1115d - Max Choking 1:1 Balun, 1.5-54 MHz, 5kW. 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.). . 74 0 obj <>stream This antenna, which works on 10, 15, 20, and 40 meters, has a very high impedance of around 2,500 Ohms. 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 In addition to multiples, Ultimately, this housing works fine, but it is heavy and clunky.). 49:1 End Fed Half Wave Antenna 40-10M 100W Version Bands of operation 40,20,15 & 10m using 67 feet of our UV, Ozone resistant Antenna wire. In stock . Turns 1 through 14 are secondary windings (the long wire). Antenna Safety! , This is a partial reprint (with permission) of an excellent series of articles published by KV5R An end fed half wave antenna is one of a specific length depending on the frequency that it is to be used on, for example, an end fed half wave antenna for 80 meters is about 130 long. For those that enjoy the LNR and Hy Endfed antennas, but want to run more power, Balun Designs now offers an excellent alternative. 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. 35-45, 54-64, 67-77. %PDF-1.4 /Length 10 0 R 3 0 obj 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. The length should be calculated based on the lowest frequency to be worked. 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. The beauty of the halfwave antenna is it's a complete antenna in the sense it needs no counterpoise. Anyway, an old friend mentioned 'MyAntenna.com' but they were closed for the summer. Superglue 2 toroids together. I actually did this first and before the connector was bolted to the box. and leave the unun on the ground. 6 0 obj is helpful if you're in a hurry to get on the air, read up on the topic The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. The counterpoise wire does not have to be similar in length to the main radiator wire and just a short wire is all that is needed, about 0.05 . 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. This type of antenna is very easy to install because there is no need . 35. For typical tuners built into a rig, Post Reviews June 8, 2022 at 9:17 am. Cut the center conductor wire (free untwisted end of short wire) of the unun to the correct size, scrape the enamel insulation off of the free end with a box cutter, and solder it to the SO239 connector. Wire Lengths For 9-1 Ununs | PDF | Electricity - Scribd 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). /CropBox [0 0 748 752] 2 0 obj You also want the antenna to be at least 1/4 wavelength long for each band you plan to use. x@ 75/80 METER RESONATOR KIT FOR THE UJM-EFHW-40-10 200W 40-10m ANTENNA 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. End Fed Antennas - Elgin Amateur Radio Society and experiment. 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. ones <> 35-43, 49-63, 70-85. PDF Wire-Lengths-for-9-1-ununs - OM0ET 40-30-20 . 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. 35. Some of these numbers are too close to squeeze in between them. You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. Unun 9:1 - VK6YSF - Home Page 1:1, 9:1, 49:1 Matching Units - What's the difference? - YouTube 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. /BitsPerComponent 8 << Ham Satellites Engineering the EFHW 49:1 Transformer and Antenna As an example, a 28-31 foot wire will typically allow 40 thru 10 meter coverage and a 43-50 foot wire will provide access to 80 thru 10 meters. What these lengths are depend on your tuner and also the wire's surroundings and also the ground system. random wire should use 423/f. 6 Screws/ Nuts/ Washers/Wing Nuts And Ring Connectors, 1 X Mica Capacitors 100pF 500V 5%(Mouser Electronics), 1 x 4 in. <>/Metadata 239 0 R/ViewerPreferences 240 0 R>> Following the directions exactly as specified (0.47wl / 0.05wl matching counterpoise) and drilling two weep holes in the appropriate position, I had a 10 meter EFHW antenna up in less than ten minutes. (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. 73. JACK, VE3EED I did not want to put the transformer in the housing until I tested it. 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. Attaching a counterpoise wire to the common point of the auto-transformer provides the antenna radiator something to push against rather than the coax shield.
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