$59.95 Buy It Now or Best Offer
free,30-Day Returns
Seller Store robdhky
(294) 100.0%,
Location: Hardinsburg, Kentucky
Ships to: US,
Item: 235809009943
All returns accepted:ReturnsNotAccepted
Compatible Brand:Universal
Size:50 feet
Color:Black
Band:AM,FM,HF
MPN:Does Not Apply
Compatible Product:Any radio and or tuner for HF coms
Directivity:Depends on user deployment,Omni-Directional
Nelson Antennas:Nelson Antennas
Type:Antenna
UJM-150-50:UJM-150-50
Frequency Band(s):HF
Features:Multi-Directional
Country/Region of Manufacture:United States
END FED “RANDOM WIRE” HF DIPOLE 9:1 ANTENNA/STAINLESS/80-6 METERS/150W PEP/50 lenght Description From Original Nelson Antennas Website: UJM-150-50WIRE LENGTH IS APPROXIMATELY 50 FEETFor Stealth, the wire is high quality MARINE 18AWG fully tinned insulated stranded copper wire. Marine wire is tough and made for harsh environments END FED “RANDOM WIRE” FOR 80-10 METERS WITH ONLY RADIO & TUNER, MANY PICKY BUILT IN RADIO TUNERS WILL TUNE THIS ANTENNA PERFECTLY ON 80-6 METERS!! Made in the USA ALL STAINLESS ANTENNA HARDWARE MODEL so there will never be an issue with components starting to rust. Tiny and light weight but ready and capable to put in work! This unit is encased in a 1″x 2″x 3″ ABS box! And comes with a VERY HIGH QUALITY SO-239 connector. Does your HOA try to deny you the ability to have antennas up? Are you looking for a quick and convenient way to run a portable (end fed) dipole without needing 2 or 3 supports or several antennas for portable or permanent operation? The UJM-150 may be just for you. This unit will allow running an end fed dipole (1 single wire) on most bands with just a single wire and radio+tuner. This unit is made to tune well with even picky built in radio tuners. Matchbox is made with a larger toroid than most here and solid copper wire allowing more power to run through it. You can run from QRP to 150Watts PEP and 60W digi modes. This is accomplished with a trifilar wound unun (not balun) transformer at a 9:1 ratio. How this works is really quite simple. Running a standard dipole with 2 elements has about a 72 ohm feed point at the center but end feeding a dipole will result in impedance levels from 1800 to 5000 ohms! That’s way too much for a tuner to handle right? Well that’s what this matchbox takes care of. Simply put it brings the impedance down to levels that tuners can deal with and the wire length shipped with the antenna creates a good match for all band tuning. HOW TO DEPLOY First off you will need a tuner! These are made to be used with an antenna tuner. The bands you can tune up and work depends on your tuner. Use at least 16 feet of coax from the box to the tuner! The box uses the shield of your coax so the 16 feet or more is good. Do not be afraid of longer coax folks, this is HF and coax loss is very low. Longer coax is recommended because these antennas use the shield of the coax as a radial so to speak. Running 50, 60, 75 or 100 feet of good coax is NOT a bad thing. I highly recommend deploying this antenna in a simple “sloper” style configuration. These boxes like to be close to ground level. It is recommended to secure the box down (via eye-bolt lug) within 5 feet of ground level and run the antenna element in a slope upwards and out from the box with the far end height recommended to be from 20-30 feet (6.6 to 10+ meters) high at the far end. You can experiment and deploy in may different fashions, zig-zag, inverted “L”, vertical etc but sloper is recommended. RADIATION PATTERNWhile these are VERY omni directional, you will see that in a sloper you will get slightly more gain in the direction of the antenna element. For instance, if the antenna element is running east to west you can expect a bit more gain in the east and west. Warning! Returns are not accepted by this seller (please read eBay Return Policy) . PLEASE EXAM ALL PHOTOS CAREFULLY BEFORE MAKING AN OFFER OR BIDDING. WHAT YOU SEE IS WHAT YOU GET!!! This is one of multiple items I’m listing that were acquired at estate sales, auctions or other private sources. They are often vintage, pre-owned and/or used. I do my best to describe each item in detail and provide pictures that feature any defects or issues that I am are aware of. I am by no means an expert, just a collector and I welcome questions and comments. Please check out my other items for sale or auction!
Frequently Asked Questions About END FED “RANDOM WIRE” HF DIPOLE 9:1 ANTENNA. STAINLESS/ 80-6 METERS 150W PEP in My Website
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