End Fed Dipole 80-6 meter Portable HF Antenna Matchbox System. 9:1 UNUN For Sale

OVER 4000 SOLD WITH PERFECT SUCCESS
UJM-150
End Fed Antenna Matcher
Made by a HAM for Hams
PLEASE READ FULL LISTING AND PLEASE LOOK AT EVERY PICTURE!!I HAVE ANTENNA HARDWARE LISTED IN MY OTHER ITEMS FOR SALE TOO. ITEM NUMBER
202997373525
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 High quality SO-239 connector. This is available in a BNC connector version in another one of my listings.This is by far my biggest seller and the zinc coated hardware will last in weather for years but some customers would still prefer Stainless antenna hardware. If this is you please scroll up to my username in the upper right of the screen and click "see sellers other items" to buy the all Stainless hardware version if you would like.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 dipole without needing 2 or 3 supports or several antennas for portable or permanent operation?
The UJM-150 may be just for you.WHY MY MATCHBOX IS DIFFERENTI have a unique toroid that I custom order for my units. After many many hours and many dollars spent in R&D I finally found the best working comination of toroid and wire size and type. Simply put, my unit is NOT a "google how to" and throw together unit. I take pride in my work and products and make them the best I can.
This unit will allow you to run an end fed dipole (1 single wire) on almost any band with just a single wire and radio+tuner.
My 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 easily when using a tuner with random length, (50W max digital).
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 a tuner isn't even needed if you trim to a good length.HOW TO DEPLOY
First off you will need a tuner unless you use the chart provided a little lower in the description and trim to resonant length! The bands you can tune up and work depends on your tuner. I use a LDG with my 897d and I can tune up 160-6meters. Although probably not very efficient on 160 it will tune up for me.
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.
You can run your antenna as a vertical/sloper/inverted L/or zig zag even. Myself, I usually use a 60' wire and wrap it around and up my 32' telescopic mast while portable. Or I use a 30' wire and run up 20' or so and make an inverted L. The fun thing about being a ham is experimenting and finding out what works the best for you in your situation.
COMMON AND PROVEN LENGTHS OF WIRE TO RUN ARE AS FOLLOWS;
(FEET) 35.5 41 58 71 84 107 119 148 203 347 407 423ALSO, AFTER YOU PURCHASE AND BEFORE I SHIP I WILL SEND YOU A MESSAGE WITH A WEB LINK TO SELECTING A LENGTH FOR YOUR INTENDED PURPOSE.I have many customers that swear this thing rocks on 20 meters perfectly without a tuner using a 84 foot wire and they can tune up on ALL other bands.
Some bands may benefit from using radials or a small ground rod depending on the antenna wire length. You can add or subtract from your antenna wire to obtain a better match for any band/s you wish.
So just run your antenna wire 22-84 feet, run to your tuner and to your radio, tune up and talk!WHY ARE MINE SO CHEAP IF THE QUALITY IS STILL TOP NOTCH?
Very simple! You are buying the matchbox. You can use whatever wire or cable you want for your element. There is no sense in sending this with a 40'piece of 14-18 gauge wire when you may want to use 84 feet or 22' right. I myself use a small stainless braided cable from a fishing down rigger for my element and I'm very very happy with it. You can Youtube Nelson Antennas or Nelson End Fed and find customer reviews.
Most users will find no rf issues and find no rf choke is needed. That said, using a GOOD rf choke is always good ham practice and I do have my own designed choke/s with full choking specifications listed with the one authorized distributor for them. It can be found by putting the item number in the search bar. That number is 264946030545WARNING!!!
I am s top seller of portable antennas and there something you need to understand if you don't already. Other sellers state..... "Mine is not just a matchbox that you must use a tuner with but mine is truly resonant." Think about that for a second folks, mine is the same way with the added correct length of antenna wire! Fact is that some people don't have room for 65 feet of wire and some people want more than 30 feet of wire so I leave the length you would like to run up to you! You can run a random wire like 30 feet and use with your tuner and radio and tune most if not all bands depending on your tuner. Or you can run 200 feet and do the same. Or you can test a few lengths and find a length that will work well on all of the bands you want to work and choose your own length and guess what....You can find a length of your own that is resonant on all of those bands without a tuner just like the other guys act like they invented.
Fact is folks, I make a great product at a good price and always stand behind what I sell. I will always take care of my customers as my feed back surely shows.
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