The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! I actually did this first and before the connector was bolted to the box. 40-10m with a 49:1 Unun. RFI Tips and Tricks /Kids [ 4 0 R ] Some important and helpful references I used for this work: https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. So after much frustration..down it comes and you go on to a totally different type of antenna.all that time just wasted inyour opinion..until now! So for 80 meters (say 3.525 MHz) this gives you about 133' of wire. 35. X:nzf4p:t;r }~_HOZcX:^$* J^XZuu|"nX/Wkw0hA>y1(z2+v_Xzu[/:^$*m*>hk_:+c{ I have never tried to transmit through it, but it proved the optimal ratio for receiving with my setup. /Creator (XnView) 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 numbers aboveare a great start, thanks to Jack and Mike! To summarise the results WRT to reference antenna consisting of 30ft wire vertical fed with auto- 3 0 obj /CreationDate (D:20221212112042) Ham Satellites A way of connecting the analyzer to the transformer. , The "Best" Random Wire Antenna Lengths /Length 10 0 R Placing 3000 to 4000 ohms of resistance between the free end of the twisted portion of wires (the gound) and the free end of the long wire (the wire that connects with the antenna radiator after the 14th winding), can simulate adding an antenna radiator wire to the unun impedance transformer. See the picture below. Just a note, if you make one of these yourself, you need to twist together the first two wraps of the 14 winding wire with both wraps of the two winding wire. . Having the option to switch rapidly between 49:1 and 64:1 should prove to be a really nice feature.. understand its properties. Code Practice Humor N4UJW. A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. ones SO-239 connectors are silver plated with Teflon insulation. 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. Wire lengths for the 4:1 ratio in models 4932 and 4935. 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. This will be for an eyehook in order to provide strain relief for the radiator wire. "Here's the word on random-wire antennae.". /Type /Pages It may not display this or other websites correctly. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. Kj8~q7c? Mike ab3ap, Editors note: Many thanks to Jack, VE3EDD (SK)and Mike, AB3APfor sharing their math and computerskills with us. You need to use these lengths and the longer ones . excellent page for EFHW info - or, addressed below, to cut the wire 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. 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] HF & Shortwave Here is an ARRL ", KiwiSDR Online Radio - 500 ft Northeast Beverage, KiwiSDR Online Radio - 400 ft South Beverage, KiwiSDR Online Radio - 10/11m dipole up 20 meters high. Random wire lengths you should and should not use! Hi guys,not really hfu related,but I tought I might ask here as I have my account. 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". 9:1 Unun EF Random Long wire matching Transformer with BNC or SO-239. endobj So for example 80m could range in length from 120 to 133 feet. InJack's own words. Antenna Safety! Quantity: Sold individually. The magic lengths to use with the End Fed longwire is 29, 35.5, 41, 58, 71 and 84 feet I use a 29 foot wire with my PackTenna 9:1 balun for 40m-10m and then add a 28 foot length for better coverage on 80m when needed. . Experimenting by slightly changing the wire length (+ or-) is encouraged to provide best overall performance. 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 He had heard good things about 'Balun Designs' so he recommended you. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. these are the worst lengths and you want to be as far from colored A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. These dimensions were derived from modelling the antenna in EZNEC. I connected it to a 33 wire running from my balcony, through the trees, and ran WSPR overnight to check things out. 73, This type of antenna is very easy to install because there is no need . The key to end fed antenna success is the matching network interface between the long wire antenna and the coax feed line and feed line choke at the transceiver. often can't match it. So you have the freq range of interest and the total length of the wire, figuring out wich balun will be a better match for 50ohm coax should be easy. Wait a few minutes for glue to set. 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. 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 32.00. STORE The unun was floating at about 15 feet above 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). Notice from column f that there is no length giving low impendance for , Most matching problems occur when the antenna system bands as possible. This transformer is designed to be used with an end fed half wavelength of wire only. I made just a touch over 100 QSOs today with the new unit. /Height 752 1 0 obj Let the now free end of the short wire hang down from the toroid. About Hamuniverse Stacked coreswithwinding configured as 49:1auto transformer. wire is at least 1/4 wavelength. Power Handling (CW/SSB): 100 W/200 W Enclosure Width: 2.500 in. 31 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. Drill another hole in the same side as the antenna radiator wire mount hole. Free Postage. Our newdesign isperfect for matching both long and short length wire antennas for multiband use. Vhf and Up 6 Screws/ Nuts/ Washers/Wing Nuts And Ring Connectors, 1 X Mica Capacitors 100pF 500V 5%(Mouser Electronics), 1 x 4 in. Re: 9:1 or 49:1 unun for end-fed long/random wire? A success! Use with other lengths can potentially damage the transformer depending on power level in use. Downward impedance transformation by factor of 49. This transformer is designed to be used with an end fed half wavelength of wire only. 5 0 obj 40-30-20-17. Note: My (A to B) length was 6 inches. 40-30-20 . 27.00 (27.00/Unit) Free Postage. I only used two screws instead of four. random wire page. 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. 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 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!! endobj If you want a single band portable antenna you can mount pretty much however, look up this design. Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth. 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. uR5I5z G^u2`j[}+sy9 The QRP End-Fed Half-Wave Antenna 49:1 Transformer Building a great impedance transformer for Ham Radio end-fed wire antennas. (wlSR9dJ_x%+VHX4FRr 3>;g^x%g'wkJu,i~#Q"2|WGf[!_m]#&1$)R.{--" 'dGO;=_B$T}".
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