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Random wire antenna unun. The EFHW with the same feed had a noise floor of S8! My attic 20m dipole is normally S4-S5 on the same band (tested at the same time). Dec 11, 2016 · The random wire with a unun is my favorite, but I still use the hamsticks and wire dipoles in some situations because they offer better performance. The antenna will perform better if you can lay out a ground wire; otherwise it will use the coax shield and radio chassis for ground. We would like to show you a description here but the site won’t allow us. Dave C KD2JIP. It's better to connect a counterpoise wire to the 9:1 unun and follow that with a 1:1 current choke on the coaxial cable between the unun and the rig. Palomar Engineers employs a dual core matching system that offers wide bandwidth (1-61 MHz), 500 watt PEP rating, and a connection for a Technically a true "longwire" needs to be at least one wavelength long. An old but good multi-ba 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. I've configured it as a linked dipole on 20m and 40m, and as a verticle on 20m, 40m and 80m. Note this is an UnUn, not a Balun, as it is interfacing between the unbalanced coax feed line and the unbalanced antenna. Less wire makes for an easier to install antenna in tighter, size compromised locations. Figure 1 Typical ATU and long wire antenna configuration with an earth or earth plus counterpoise. With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun is one possible solution. You will need a tuner, but with a single antenna wire setup, all the bands can be in your grasp. Spark Plug 9:1 Random Wire Transformer - 100 W. Yesterday, I worked a guy who said he was running 500W. The antenna can be used as a sloper, “L” with a vertical section and a longer horizontal section, or as a random horizontal antenna between two trees or supports. Wire lengths for the 4:1 ratio in models 4932 and 4935. Post 2111. 00. The key to making this antenna work efficiently is to add a 9:1 UnUn and a good counterpoise system. The “Bullet” End Fed Long Wire Antenna. The unun seems to handle 40W PSK and 100W SSB perfectly fine - the full power limit of the tuner. The PackTenna Mini Random Wire Antenna combines a 9:1 UNUN, winder and antenna wire in a compact unit that is quick to set up and take down. #3. Here are some of Paul's observations: "This is my new design of the small 9:1 UnUn for portable QRP Random Wire Antenna. In fact, the 9:1 unun that I built is actually an autotransformer. Optional: if you add a ground terminal for a counterpoise wire, jumper the bnc ground to the ground lug. Here are some general comments about the antenna from Stan: If you are antenna challenged and need to keep a low profile, then a small gauge random wire is often the answer. Completed 9:1 UnUn. They can come close to half wave antennas in efficiency, although efficiency decreases as they are made very long or installed closer to earth. A “random length” wire, the length of which is sometimes carefully selected to be non-resonant on any of the bands of operation, so it really isn’t very random. Post 2121. I’m still amazed at the success I’m having with my random wire antenna on 80m. Here’s a list of recommended lengths of wire to use with a 9:1 unun. $94. The idea is to bring the impedance if a "random wire" down to a value your tuner can handle. The tuners all work well for a period of time and then they begin arcing internally, as evidenced by a varying SWR Well thought out complete set of components for wire antennas. Teflon insulated SO-239’s are preferred. com 7. When installed the wire is supported by buildings or trees using the insulators to prevent a short circuit to ground. This compact wire antenna is ideal for SOTA activations, camping, backpacking, and travel. In general, the longer the random wire, the more efficiently it will operate on the lower bands. In addition to its regular use, the EFHW serves as a reliable emergency backup during severe weather events, providing an efficient and resilient HF solution for ham radio operators. Figure 2 Typical 9:1 voltage unun and long wire antenna configuration with an earth May 31, 2023 · For good 10 through 80 meter coverage, you’ll find that a non resonant wire of about 74 feet is ideal. The other end connects to the random-wire connector on a suitable antenna tuner. 8EC18000-9D66-44E8-8C9A-B6452AC9FFE6. Calculated at Checkout. We can also hang up less wire for a portable operation as a 40 meter random Oct 19, 2019 · Reviewing the PackTenna Mini antenna with a POTA activation. Asking for help to solve this as it looks like my antenna has claimed another victim. necessary unun and choke. This allows you to position the unun away from the house and then feed the antenna with coax. Apr 5, 2023 · Thanks to "The Smokin Ape" for this in depth analysis of the theory and practical applications of end-fed random wire antennas. It’s such a small antenna and can easily find matches on my favorite POTA/SOTA bands: 40 meters and up. Jan 13, 2020 · VK2PRC Half Wave End Fed Vertical Antenna for DX. Using both pieces of wire and the LDG IT-100 tuner, every band between 80m-10m could be worked. --. But how does it work, and does it work! Peter g3ojv, takes a look The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes The “Almost Random” Wire Antenna. #18 Teflon wire can be purchased from Amazon (“Remington” brand name) 8. An “ End-Fed Half-Wave (EFHW) ” antenna. $85. The antenna comes with 29' of 26 AWG copper clad steel wire with a great "silky" jacket to minimize wire tangle. March 12, 2007 By Dan KB6NU 26 Comments. cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes with putting up a more elaborate antenna. 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. 73, Noel W2MSA. packtenna. sold out. Like every antenna that exists, random or long wires have advantages and disadvantages. The random wire with counterpoise (version 2) is a great option for backpacking/camping because it eliminates the need to bring a roll of coax but still gives good performance. Of particular importance is the design, construction, and testing of a 9:1 Unun, which is an integral part of this antenna system. 6. Hope it’s clear now, if not. Quantity: More payment options. some lengths dont work due to harmonics. com/store/p1/PackTenna_Mini_Random_Wire_Antenna_%289%3B1_UNUN%29. You can set it up either strung up in the air or as an inverted L (my favorite configuration for portable use). The image with the red toroid is a very common design for a 9:1 UnUn. The two ununs are essentially identical other than physical size of the unun and toroid. 4. You can cut the wire to fit your needs. well, the main antenna wire goes to the 9:1 UnUn “+” connector, the vertical counterpoise (insulated !) wire to the UnUn “-” connector and then down to ground there it connects with the two other wires but neither the counterpoise nor the two other wires are connected to ground. Usually any wire length that is non resonant on the band or bands desired will work with the 4:1 ratio. What does a 9:1 balun do? A 9:1 balun (unun) is used to match the impedance between an unbalanced antenna (such as a random wire or long wire) and a coaxial feedline. Doesn't even take a huge amount of wire usually. 9:1 VOLTAGE UNUN. You can also feed the antenna remotely through an unun (either a 4:1 or 9:1 unbalanced-unbalanced transformer). Oct 3, 2014 · This 9:1 unun does NOT have a terminal for a ground; just a bolt and nut to connect a random wire antenna and an SO-239 socket on the side. Aug 12, 2016 · A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. Solder 2” of stranded wire to the inside surface of the SO-239. Please ANTENNA. I have several toroidal ferrite cores laying around from disassembled power-supplies and such, but the many websites I've visited that show the construction of the 9:1 unun have not specified what type/mixture/diameter of toroidal The wire could go out the shack window, over the house and down the garden – it will all depend upon your garden’s layout. This is a compact portable antenna system that I've used for SOTA and NPOTA activations. How to Feed an End Fed Wire? The Balun or in this case the Unun The end fed wire regardless of its length presents a high impedance to the feedline. May 14, 2022 · Sorted by: 1. The place where a 9:1 or 49:1 transformer balun matches the off center impedance isn’t at the very end, but close to the end. 71 foot is good. As an example, a 28-31 foot wire will typically allow 40 thru 10 meter coverage Apr 15, 2019 · Initial testing with the random wire I picked (I’d measure it but then it would cease to be a random wire) showed the SWR on 30m and 20m was below 2:1. Here is a guide to the right lengths to choose. Additionally, we go through the process of building a 9:1 Random wire antenna. In this case is recommended to use at least 5m long coaxial feedline or longer. Back-to-back unun Oct 31, 2023 · The power rating of a 9:1 unun can vary, but a common range is 100 to 300 watts for amateur radio use. Heavy duty 5kW, 4:1 unun designed for use with wire verticals, long wires and multiband monopole verticals. Peter does an excellent job of explaining how the LDG 9:1 UnUn fulfills this difficult requirement. Utilizes stacked cores to deliver efficient broadband performance and high power rating across all HF frequencies. Post 2113. Aug 20, 2021 · This is part 1 of a 4 part video that discussed how to build and test a Multiband Long Wire Antenna, a 9:1 Unun, a 1:1 RF choke, and an Antenna Tuner. You apply a little RF and adjust the antenna tuner to achieve the A ground rod doesn't contribute much to any sort of antenna system unless it's hit by lightning. Solo antenna mast erecting - Ham Radio know how. Sep 8, 2021 · RANDOM WIRE ANTENNAS USING THF LDG 9:1 UNUNS. Buying Packtenna allowed me to get a working antenna out-of-the-box. UPC: 650619115178. Multi-Band HF Fan Dipole Antenna Construction; Ham Radio - The Doublet antenna, QSOs and observat Ham Radio - The Doublet. With that 72' section, try a counterpoise around 15' or so and you'll probably see an improvement. It can however also be used as a balun Nov 24, 2020 · A properly designed random wire combined with a UnUn balun and a wide-range "tuner" can often get you on the air when nothing else will. . Specifications. Add Top Support Eyebolt TEB1: Yes No. The current fad is to feed them with some sort of matching transformer at the feedpoint, but there are other options. This is considered a random wire end fed antenna, not to be confused with a half wave end fed antenna which uses a 49:1 or 64:1 unun and a wire that is a half wave length. Long wire or random wire antennas are very simple antennas. #2 TEST: MINI 9:1 UNUN and 41m long Random Wire A #1 TEST: mini 9:1 UnUn Random Wire home made Anten New Mini QRP 9:1 UnUn and Random Wire Antenna (Par Ham Radio Station Grounding. This sure beats the 133 feet necessary for an 80 meter end fed half wave. 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. Advantages. 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. There’s now no doubt in my mind that a random wire can be an effective antenna. Jan 27, 2022 · On January 10, 2022, I decided to try one more antenna: the PackTenna 9:1 UNUN random wire. Mar 26, 2022 · For reference, my Random wire on my 9:1 unun has a noise floor on 20m of about S3. This design has been used up to 400 watts output with good results. A wire antenna kit, with a coil of wire, strain insulators and a balun. A random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a particular In the case of a 1:9 UnUn, the power line (coax) impedance of 50 ohm will be transformed up to an impedance of 450 Ohm. Unun 9:1. prcguy said: On the 9:1 types the coax can be part of the antenna, so I would put it away from the entry point of the house to catch any RFI riding on the coax from things in the house but far enough from the 9:1 transformer to be useful for reception. A random wire is exactly that—a piece of wire that’s as long as you can possibly make it. Another turn or two (above what's specified for 43 material) could be necessary though. 119 better for 80m. Mar 10, 2016 · The transceiver's antenna connection is an unbalanced BNC jack and the random-wire antenna is, well, a random wire. The PackTenna Mini Random Wire Antenna combines a 9:1 UNUN, winder and antenna wire in a compact unit that is quick to set up and take down. Oct 27, 2022 · Remember an antenna using a 9:1 matcher is meant to use a tuner, whether in your radio or external. Recall that a resonant wire fed at its endpoint has very high impedance, the reason that EFHW antennas use an unun with 49:1 or greater impedance transformation ratio. The SWR values you show are right where they should be. 9:1 voltage unun using a T-200-2 powdered iron toroid core. FWIW, my experience has been that 73 material is "better" than 43 material for HF transformers and baluns. If the intention is to build a ½ wave mono band antenna then it is necessary to attach a 48:1 unun at the feed point given the extremely high impedance. You apply a little RF and adjust the antenna tuner to achieve the A full review of the Nelson Antennas END FED "RANDOM WIRE" HF DIPOLE 9:1 ANTENNA. An end fed isn’t really an end fed, but a highly off center fed, off center fed dipole. Post 2112. lose the 9 to 1 unun and use counterpoise. In this two-part tutorial, Paul (OM0ET) show us his new design of a compact 9:1 UnUn for portable QRP Random Wire Antennas. jpeg. The 9:1 Spark Plug provides 80 m through 10 m band coverage in the familiar Spark Plug form factor. Jan 12, 2023 · The most popular non-resonant antenna is the simple random wire antenna. Sep 13, 2021 · Random wire antennas are good antennas if you use a 9:1 UnUn to match the high antenna impedance of the wire to the low impedance of your transceiver. After all 50 x 9 = 450. com/k8mrdradiostuffFollow m Feb 12, 2023 · The “random wire” to be paired with a 9:1 unun can be better described as a non-resonant wire. YMMV, of course. A lot of internal tuners are limited as to how large of impedance they can handle. FT-240-43 toroids can be purchased from kitsandparts. Features. Add to Wish List. The paperwork that comes with this little unit says that it can be used for power levels up to 150W but so far I have only used it pretty much for PSK31 and low power SSB (50W or less). 9. The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes with Jan 26, 2016 · Green wire on left side of unun winding goes to bnc ground. Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50Ω (unbalanced) coaxial input, hence UnUn. This video discusses End Fed antennas and particularly End Fed Random Wire antennas for ham radio. These are based on the use of a sloper configuration with the unun near ground level but final Jun 7, 2022 · June 8, 2022 at 9:17 am. One end of the wire attaches to a tree, pole or other support, preferably at a high point. Jul 6, 2021 · Jul 6, 2021. 95. Workable: Attach counterpoise stud on unun to a good ground rod at the feed point of the antenna. This Mini 9:1 UnUn can be used also as the base point of a vertical antenna with its random length (minimum lenght should be at least 6m). The Packtenna random wire is a brilliant little antenna to pair with radios like the X6100 that have built-in, wide-range ATUs. If you have 40-45ft of coax then try the choke 20-30ft from the antenna if Jan 24, 2020 · Modified RANDOM WIRE ANTENNA with 9:1 UnUn (part 2) Random Wire Antenna with 9:1 UnUn. Consider becoming a Patron @ https://www. This unun is an excellent match for any of the 43 Sep 4, 2018 · I made the HF multiband Random Long Wire Antenna with UNUN 9:1 (my toroid T130-26 from an old PC PSU) publicated by VK6YSF on his website here:https://vk6ysf Designed for use with end fed wire antennas and multiband verticals, this unun is small, compact and perfect for quick portable/emergency installations. For it's simplicity and small dimensions is very popular for portable or SOTA activities, and also as a static-mobile antenna. Purchase your MFJ EndFed 1/2 Wave 300W 80M-10M Wire Antenna - MFJ-1982MP from GigaParts today. So, if you connect a length of wire that presents an impedance of about 450 Ω to the input, you’ll get an impedance of about 50 Ω on the output. Long Wire Antenna. Your effective RF ground is the outside of the coaxial cable shield and everything connected to it. Random Wires. Select Configuration: Required Model 9135s - Studs on sides w/std hex nuts Model 9135sw - Studs on sides w/wingnuts Model 9135ew - Eyebolt on Antenna side. html#/Heres If you mostly want to run the most popular bands, a 4:1 unun with 55ft on one side and 12ft on the other (a 5/6 OCFD) will be truly resonant, with an SWR low enough to tune internally, on 40, 20, 15 and 10m. Most of these employ a 5:1 or 9:1 matching unit so that antenna tuners can bring the impedance down to acceptable levels across the bands the antenna was cut to cover. Time Owned: more than 12 months. The 43 material might be "better" for 160-meters, AM-BCB, etc. Recommended wire lengths and Configuration Notes for Unun models 4932, 4935, 9130, 9132 & 9135 The following tables show the recommended lengths to use for the antenna wire based on the bands you wish to cover. Description. Nov 15, 2021 · Thanks to Peter (G3OJV) of the "Waters and Stanton Video Channel" for this excellent introduction to random wire antennas. http://www. All you need for a random wire 5. Works well with both internal transceiver and external antenna tuners. Currently have a 44 foot 'random wire' antenna (w/ 20 ft counterpoise) with a Palomar 9:1 unun that keeps zorching automatic tuners. You can add your own wire or get the complete product from this link EFLW-3K antennas. This design is excellent for matching both long and short Jan 22, 2020 · This is post 2122 in a continuing series of simple ham radio antennas. Disadvantages. Apr 22, 2022 · Before talking more about EFLW antenna lengths it’s probably worth discussing some designs for the 9:1 matching transformer. QRP Dummy Load With Power Measurement. Unlike the other Spark Plugs, a counterpoise lug is incorporated into the 2021-12-24 The past few days I have been using both a 29' and 35' version of the QRPGuys 40-10 mini unun tenna and the QRPGuys 40-10 unun tenna, sometimes referred to as random wire antennas. These are sometimes known as a Magnetic Longwire Balun. He was, of course, 599 here, but he gave me a 589. but Hams commonly call any end-fed wire a longwire or more correctly random wire antenna. The Random Wire Antenna is popular with Han Radio operators around the world. 5 - 54 MHz. Aug 6, 2020 · Re: Putting up a "random" wire antenna for HF bands. patreon. Antennas 101 / How does an antenna work Long wire or random wire antennas are very simple antennas. 00 $95. Thus the need for a short counterpoise (so 5 to 15% of the antenna is on the other side of the transformer/balun Random Wires. This 4:1 Unun (200-50 ohms) will easily handle 300 watts and covers 1. </div>
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