Bands . In reality, the 9::1 works well for endfeds and so does a 50 ohm coax connected to the end of the wire. Well, the CW end of 20m was well busy, plenty of activity on the other bands, and it's tuned up on 80m through 20m without any bother. As a newbie, it is easy to be overwhelmed. Change ), You are commenting using your Facebook account. After all 50 x 9 = 450. The magic lengths to use with the End Fed longwire is 29, 35.5, 41, 58, 71 and 84 feet. Recommended Wire Lengths for 9:1 ratio (in feet) for Coverage of 160m through 10m 53 59 72 88.5 98.5 124.5 146 162 175 Values in color are best overall lengths to use for optimum HF spectrum coverage. Recommended wire lengths for Unun models 9130, 9132 & 9135 Typical SWR relative to wire lengths. ( Log Out /  The W1SFR End Fed 35’ Random Wire Antenna with 9:1 UnUn What is a random wire antenna and how does it work? It's a decent match on everything from 40m to 10m, but i was wondering about the effect of the length if the counterpoise. Thus 8, 16, 32, 68 lengths are ruled out. I almost bought one of these for around £30, but then decided to make one. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Jack, VE3EED, used center frequencies of the bands described in the article above, and I … Recommended wire lengths and Installation Notes for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. We sell the Bullet separately so you can add you own wire type and length (see table of suggested lengths below) or you can purchase a complete antenna system including wire and end insulator. Change ), Tokyo Ham Fair and Huntsville Hamfest- Kenwood TH-D74 Released D-Star Radio, Program Your Yaesu MH-59A8J Microphone for better Usability (FT-857D), Comet HFJ-350M Portable Antenna Review- Make your Icom 705 Sing like a Cardinal, Yaesu Serial Number and Date of Manufacturing Decoder, Using antenna tuner AH-4 with IC-705 JK3AZL Naoka Takaoka - English Translation, LDG Z-817 Review and there is a BIG SECRET Reveal, The Comet HFJ-350M TOY BOX - IT NEEDS A COUNTERPOISE TO WORK. X=(150 Meters)/(frequency in MHz) X1=0.131 X. X2= X-X1. ( Log Out /  9/1 (450 Ohm to 50 Ohm) UNUN as “pre-match unit” for use with multiband endfed non resonant longwire antennas. The Bullet uses all stainless steel connectors and a dual core ferrite 9:1 unun for higher power rating then many competitive products. Hello, as the title,what unu nto choose 9:1,6:1 or 4:1 for a 58 foot random wire from my balcony to a tree,30 feet counterpoise and 30 feet coax to the radio.I have in hand a 1:1 choke to install it before the shack entrance or agter the unun.But the problem is what to choose,i will use an external tuner at the radio.100w max bands using 40 to 15 will try 80 later The Bullet uses all stainless steel connectors and a dual core ferrite 9:1 unun for higher power rating then many competitive products. SWR will vary based on topography, wire orientation and use of … I'm quite impressed with it so far. This 9:1 Unun (450-50 ohms) will easily handle 300 watts and covers 1.5 - 54 MHz. Create a free website or blog at WordPress.com. In the case of the end fed random wire, some lengths are … This 200 watt Unun also operates "stand alone" meaning that it does not necessarily require a tuner for use on certain antenna. Thus 8, 16, 32, 68 lengths are ruled out. SWR will vary based on topography, wire orientation and use of ground or counterpoise. End-fed multiband antenna - BalunDesigns. The 9:1 UnUn for this antenna uses a FT240-K ferrite toroid wound with 18AWG enamel wire. Due to the nature of wavelength and impedance at various frequencies there is a magic wire length to use for this type of balun. This means that the length of the long-wire antenna must be chosen in such a way that the impedance in the feeding point on as many frequency bands as possible is about 450 ohm. I wouldn’t use one for my base station as the dipoles and verticals are the preferred way to go. Wire Lengths for Various Band Combinations. ( Log Out /  The antenna cannot be an actual 1/4 wave length on any ham band. Balun Designs - (817) 832-7197 - http://balundesigns.com. 18Awg enamel wire and lowest SWR 9130sw - Wing nuts, the End... A good antenna for field and portable use Ohm to 50 ohms down to 50 ohms your. 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