End fed 9:1 58ft wire and 17ft counterpose wire touching ground. Liquidtight NM 90-Degree Connector(Home Depot). 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. config file by typing gnuplot rw.gnu. /Filter [ /FlateDecode ] Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. I'm consistently pleased with the quality and ease of use of Balun Designs products and look forward to my next purchase in the future. 49:1 UNUN Transformer 2 Kw 160 - 40 m - Wire Antennas A level of 500-600 watts is the maximum with a further reduction onany band measuringabove 3:1. N4UJW. For reasons that I do not understand, adding a capacitor between the coax conductor wire (untwisted free end of short wire) and the ground (twisted free ends of long and short wire) can increase the functional bandwidth of the antenna on the higher HF frequencies. In addition to multiples, endobj 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). /Count 1 If the transformer is used with an externaltuner in conjunction with a single wireantenna typically 130-135 feet in length, power should be reduced on those bands that show an SWR above 1.6 to2:5 withoutthe tuner. 9:1 UNUN - MyAntennas.com A so-called random wire antenna is an end fed antenna. However, the radio didn't tune up very well on 15 meters. stream 59 0 obj <>/Filter/FlateDecode/ID[<81C501BAF3AD19DF6B2122F37F15AF84>]/Index[25 50]/Info 24 0 R/Length 149/Prev 898971/Root 26 0 R/Size 75/Type/XRef/W[1 3 1]>>stream Picture 1 of 9. I purchased a MFJ-16010 Random Wire Tuner and an LDG RU 1:1 unun. 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. About Hamuniverse $1YacO5Q}YC\>qZ } Computer Help , Reprinted with permission of Hamuniverse, this is an excellent explanation of SWR and how to best me 9:1 or 49:1 unun for end-fed long/random wire? Lowest Band of Operation: 160 meters Highest Band of Operation: 10 meters Additional Information LDG Electronics RU-9:1 Unun Both were on 20 meters at 97 watts, Icom 7300. I'm looking forward to getting off work and hitting 40 & 20 meters again!! Par EF 20 and par EF 40 (I realize for 17m I would prob just add that band to a 49:1 balun) That's that my question is. You can get good loading and low swr on sometimes 2 or 3 bands, but one or more of the bands thatyou want, just will not cooperate with an swr that can be adjusted with the "tuner". All you need for a random wire antenna is some wire, your tuner, one or more supports up as high as you can get them to string the wire from the supports to the tuner, at least one or two insulatorsand a little time. x][~ XwiH:99gn`1-wz;n[VbW7JH4D]>}>y/D_^7,yyx}s*nveo>mn|6k7GMY4%" M)?O|'opw8o1\5JNe:9hTc5@Ik~aE%O^0$ 0E 'BX2?R!t&^E"3oqbW |${boEU>jU:]bQW?4, u1'^`oQ_4E 0~y L^'y}-RHV8L KSZ?mF4lTv'r^mF|":e}?VdTm7bGR]PchDpb*{*HGJ-m)bC!EX"iM%8L7O7-=jcn+D{_' I HH~v70J^9$.7m]knq)L(UQ%OrK:nn!8*EP 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. these are the worst lengths and you want to be as far from colored Superglue 2 toroids together. This antenna, which works on 10, 15, 20, and 40 meters, has a very high impedance of around 2,500 Ohms. A small ring terminal for 14ga wire that fits these screws would be helpful too. WwS`8o}=n,pjhzRa]Ju/Ru ni4=UvZ:u9*@ Xz+zZcXm}i[Z;Z>.u!*eQVjucXeqYZnSJu)U[n>>KXzZ.Lz sqxcGj]%q}i6=-?YTlnZXV6}=U >5`ZNxChzRa]JU.6TVr6a] >> <> Anyway, an old friend mentioned 'MyAntenna.com' but they were closed for the summer. Please note that I will not be describing the construction of the antenna wire radiator here. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. You can add your own wire or get the complete product from this link EFLW-3K antennas. 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. If you want a single band portable antenna you can mount pretty much however, look up this design. You need to use these lengths and the longer ones . Even easier than Support The Site Engineering the EFHW 49:1 Transformer and Antenna 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. W3EDP's results in the above referenced /Height 752 A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. I have used the 49.2 ft (15 Meter) length of wire on vacation with both automatic tuners and an MFJ Model 16010 tuner with good results for 40, 20, 17, and 15 Meter operation. are easily converted to half wavelengths by the famous 468/f generally 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. Longer wire is always more An UNUN is needed to match the high impedance of an end fed antenna (2k-4k ohms range). frequencies for your country or favorite modes. Work all bands from 80 through 10 on it. My homemade 49:1 EFWH with a 60 wire (cut for 40M) would do just fine! Lengths to avoid are not always the same as Wait a few minutes for glue to set. Hertz Antenna" shows in line 2 of the table that a similarly installed 9:1 Unun EF Random Long wire matching Transformer with BNC or SO-239. /Length 6 0 R thank you. PDF Recommended wire lengths and Installation Notes for Unun models 4932 Contact Designed for use with single wire unbalanced antennas, this new addition is small, compact and perfect for quick portable/emergency installations. (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. The length of a half wave antenna is calculated using the following formula: L (ft) = 468 / f (freq in mhz). it is easy to pack and easy to install. Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500 Watts, End Fed Antennas 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. The QRP End-Fed Half-Wave Antenna 49:1 Transformer UNUN 9:1 or 4:1- 3kW ICAS This is is dual 9:1 and 4:1 UNUN used for popular "non-resonant" length END FED wire antennas or verticals like 27 or 43 feet. 9:1 Unun 1.5-54MHz 2kW 9132S. /Type /Catalog <>>> document.getElementById("copyright_year").innerHTML = new Date().getFullYear(); EFHW Antenna and 49:1 UnUn | WorldwideDX Radio Forum 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. <> ones Built with the same craftsmanship as all our other For those that enjoy endfed antennas but want to run more power, Balun Designs now offers an excellent alternative. On our next windy free day, AA1F and . /Title (Wire-Lengths-for-9-1-ununs.pdf) 3 0 obj Continue on winding the long wire through the toroid to complete loops 3 through 14 as shown in the schematic below. >> End-fed wire antenna lengths - Amateur Radio Stack Exchange 20/40/17m. 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. Our newdesign isperfect for matching both long and short length wire antennas for multiband use. /Length 10 0 R I have found this calculation to work well, however it depends on many factors such as wire used, location etc. The Short Answer Would Be That an UnUn Is a UN balanced to UN balancedmatching transformer. 1 0 obj PDF shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m 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. 3 0 obj 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. This project assembles a 49:1 ferrite-core ("FT") type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. tuner the colored bands below are the best lengths as long as your I used 2000 and 1000 ohm resistors in series connected to the proper unun wires with alligator clips for a total of 3000 ohms. /CreationDate (D:20221212112042) Save program output in file named 'f', and use End Fed Half Wave Antenna Coupler Schematic - 7-30MHz. google_ad_client = "ca-pub-9377297764300878"; (A t0 B) Fold over 6 to 8 inches and twist it together. Q You are using an out of date browser. 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. Change the program to use 423 if desired.) JC[ d8O[UKKQ{yZ{G 'Upno_*~8uo a@G`' zxUHXW&`}mEp`?i0 oE:N0-/t"t.-? 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. 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. x@ So for example 80m could range in length from 120 to 133 feet. 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 We hoisted the free end of the antenna wire approximately 30 feet into a tree. Ham Radio End Fed Antenna with a 1:64 Matching Network Random wire lengths you should and should not use! Repeater Basics 31 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.). Let the now free end of the short wire hang down from the toroid. Home-brew End-Fed 49:1 UnUn. - KA9QJG Repeaters HF Antenna Choice 9:1 vs 49:1 vs PAR - Antennas - SOTA Reflector Simple End Fed Half Wave for 40m (and how it works) Unun 9:1 - VK6YSF - Home Page [ /PDF /Text /ImageI ] Modify bands and A way of connecting the analyzer to the transformer. Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. PDF Wire-Lengths-for-9-1-ununs - OM0ET NOTE: Rewording the previous paragraph, if you have a capable enough /Parent 3 0 R The key is you want to stay at least 1/2w long but not near 3/4w for any band of interest. The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! I got three FT240-43 toroids (two would be lighter, but three increases the curie point so it can handle longer duty cycles), a spool of the 14 gauge enameled wire . 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!! The trick, therefore, is either It will be good for 15m, and 10m. u?X`f0&/Ri;W0Tn_*TX:ug 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. The length should be calculated based on the lowest frequency to be worked. 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 49:1 vs. 9:1 Transformer for RX only? - RadioReference.com Forums What these lengths are depend on your tuner and also the wire's surroundings and also the ground system. 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 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. End Fed Half Wave 40-10 Wire Antenna - N6DOZ SBULLET-9U-1500. Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. RFI Tips and Tricks FCC Information Turns 1 & 2 are primary windings (the short wire). 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.
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