49:1 unun wire lengths

/Resources << 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! hb```YloD@(aKI V!}g@~}%Q/[[~_=Wy-:O)x[~hs/~SGeG _QE C6q %r %PDF-1.5 Well then you need to choose a wire length that is at least 1/4 on 40 meters, and doesn't fall on any of the 1/2 multiples for ALL the bands between 40 to 10 meters While you could certainly calculate the lengths to avoid using the standard formulas, and then make a chart, the section below may be what you are looking for. google_ad_height = 600; Superior Essex Heavy build polyamideimide. <>/Metadata 239 0 R/ViewerPreferences 240 0 R>> 33 ft #18 insulated copper wire (20m half wave), Counterpoise: 1 meter coax (0.05 x wavelength) connected between 64131 and Balun Designs 1115d Isolation /Choking balun, If you would like to use high power up to legal limit with a single end fed wire antenna (not necessarily a half wave) consider using our. 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 (A t0 B) Fold over 6 to 8 inches and twist it together. /Type /Page License Study /Filter [ /FlateDecode ] 32.00. Our Ask An Elmer panel discuss this question - what's the difference between matching units?Please consider using. An excellent way to attach a long wire antenna to the Ham It Up, this 1:9 balun has an SMA output port and high-quality spring-type terminal block input for your coax. This design is excellent for matching both long and short length wire antennas for multiband use. A 9:1 matches 50 ohms to 450 ohms and that turns out to be an ok compromise for feeding 50-100ft of wire for general purpose SW receive. 75/80 METER RESONATOR KIT FOR THE UJM-EFHW-40-10 200W 40-10m ANTENNA The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. The vertical (y-) axis shows the VSWR and the horizontal (x-) axis shows the frequencies. &nb However, the radio didn't tune up very well on 15 meters. A Balun is used to match a balanced line to an unbalanced line. V#X~[Z?\ZcX:-Y?&Y?IqTnayZ{jTZOub}=UTWu1G>o.,RaT c=W>:sECXTkc=X Wire lengths for the 4:1 ratio in models 4932 and 4935. I used a homemade jig made of an SO239 chassis mount to bare wires, alligator clips, and a coax-jumper with PL259 (UHF male) ends; see picture below. Each vertical blue line represents an amateur radio band. PVC Junction Box(Home Depot), 1 x 1/2 in. %PDF-1.7 So those are the numbers above thatwe have to stay as far away from as possible when building a long-wire antenna. This design is excellent for matching both long and short length wire antennas for multiband use. Quantity: Sold individually. For instance, to work 40m be sure the antenna is at least 10m or 33' long. I connected the free twisted end of the short and long wires (the ground) the chassis wire (ground) of my homemade testing jig with alligator clip. a more capable tuner - see AA5TB's I made one without doing this and it didn't work so well. /Type /Pages It's an efficient way to get all the multiples well, the main antenna wire goes to the 9:1 UnUn "+" connector, the vertical counterpoise (insulated !) The trick, therefore, is either Meet 'Balun One Nine', a small, cost-effective balun. Vacation Closure - See Homepage for Next Availability. 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. >> /Parent 3 0 R Just add or subtract as needed a little at a time toget the best compromise. The kit includes the parts needed to construct a 49:1 impedance matching network, which will transform the impedance to 50 Ohms, which will suit most transceivers. << Because I'm more visually oriented I then plotted the many overlapping "red zones" and ended up with the page at: 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. /Producer (XnView, http://www.xnview.com) . This article details the construction of the transformer. x[q;`&z`uAlo#V@;hvOYt, @*Ys~_W_~W_aw_ p[N+}[t-^oLy}xz>7/~c|ZZt75;kN^=>Y+_~|b~"m*tw>xG=x6Qwz|xvz- /Title (Wire-Lengths-for-9-1-ununs.pdf) 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. I imported my spools from the US, but I have seen them on Ebay in the UK. I say run what you got and don't worry about it. You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. 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". The fewer bands, the fewer high impedance regions to avoid. For calculating the length of a half wave in metres, I use 141 (MHz) for wire elements. /XObject << /Im0 9 0 R >> (The numbers aboveare a great start, thanks to Jack and Mike! NEMA rated 4x marine grade junction box for outdoor installations. EFHW unun Resonant Long Wire 49:1 Transformer With 67' Antenna Wire. This type of antenna is very easy to install because there is no need . I will also find some sort of heat resistant packing material to help hold the transformer in place. [ /PDF /Text /ImageI ] Powered by BigCommerce. We recently found some good information about random wire lengths that you should and should not use. Use a slide rule! are blocked out because an antenna should be at least that long. /ModDate (D:20221212112042) 73, Again, the bands are USA, so change them Repeater Basics (Also check out AB3AP'Swebsite and say thanks for sharing his skills. stream 3 0 obj The goal of the impedance transformer is match the 50 ohm impedance of the feedline (coaxial cable) with the potential 3000 to 4000 ohm impedance expected from an end-fed half wave antenna wire radiator. For example, when adding a 1/4w tiger tail to a 2m ht with a halfwave for antenna will likely show no improvement at all in tx or rx strengths. the C code, in Matlab or Octave get a plot by simply putting the (wlSR9dJ_x%+VHX4FRr 3>;g^x%g'wkJu,i~#Q"2|WGf[!_m]#&1$)R.{--" 'dGO;=_B$T}". 27.00 (27.00/Unit) Free Postage. 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. You have to give up a band or two, like 60m and 6m, as Picture Information. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. When you're 1/2w long you're around 2k ohms or more where the balun won't under or over xform; as you approach 3/4w your z is going to drop to where a coax match can be made just by soldering the wire to the center conductor sans balun - more or less the principle of the windom and ocf dipole. Cut the center conductor wire (free untwisted end of short wire) of the unun to the correct size, scrape the enamel insulation off of the free end with a box cutter, and solder it to the SO239 connector. << /BitsPerComponent 8 This will be for an eyehook in order to provide strain relief for the radiator wire. ), Note that Jack, VE3EED,went SK several years agohe will be missed. Well, I didn't think it would make any difference at that many multiples. here are values for CW portions of the USA Weight: 0.380 lbs. He was so impressed that he purchased a 9:1 unit from you, his will be delivered Saturday. Stacked coreswithwinding configured as 49:1auto transformer. 4 0 obj Figure 3 Wiring of the 9:1 voltage unun. Power Handling (CW/SSB): 100 W/200 W Enclosure Width: 2.500 in. The 49:1 impedance transformer will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth. I won't bore you with all that so the first portion of this still only shows up to the 4th multiple. Yes, with the recent surge in popularity of the end-fed half-wave antenna, the 49:1 balun has also become the defacto ratio for use with them. >> 4 0 obj Winding 1:64 Matching Auto Transformer on the FT240-43 core. I actually did this first and before the connector was bolted to the box. The table below represents half wave lengths and multiples that you DO NOT WANT TO USE! He had heard good things about 'Balun Designs' so he recommended you. The most important length is one that is non-resonant on any band. var sc_invisible=1; Then verify it with your installed antenna and SWR measurements. >> This was 9m vertically metres up a fishing pole and then about 5.8m out. This article explains why the use of mix 43 for HF applications is almost always a mistake. A few more comments about this 49:1 autotransformer EFHW design. /Im0 Do 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. In theory, my LDG Z100 Plus autotuner should be capable of matching the impedance of this 49:1 transformer with a end-fed half wave length antenna radiator across all amateur HF bands. 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna. Free Postage. 31 The length should be calculated based on the lowest frequency to be worked. I purchased a MFJ-16010 Random Wire Tuner and an LDG RU 1:1 unun. Antenna Design I have not done this yet. InJack's own words. Technical specification : Type : 49:1 Unun Frequency : 1.8 MHz - 7.3 MHz Turns ratio: 1:7 Impedance ratio: 1:49 Input Impedance: 50 Output Impedance: 2450 Power Handling (CW/SSB/ Digital Modes) : 2Kw of peak power / DM Modes 500 watts Core Type : 3 x FT240-43 by Fair-rite Co. Wire type: Enamel copper wire 2.0 mm (AWG 12) Assembled and tested. In the first year using this unun with a random length endfed wire (Aluminum Elec fence wire at that) I managed to confirm WAS via LoTW on 10m, 15, 17, 20, 30, 40, 80. . A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. Coverutilizes integralneoprene gasket for weatherproof integrity. high the other 1.5m (4.5feet). 9:1 or 49:1 unun for end-fed long/random wire? Reading Room <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> the program as I did, above, for my K1. The novel thing was that I only built it the day before and it uses a Coghlan camping washing line spool with the string taken off and about 21m of wire wound onto it. Lowest Band of Operation: 160 meters Highest Band of Operation: 10 meters Additional Information LDG Electronics RU-9:1 Unun x 2 in. You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose. Connect this ring terminal to one of the SO239 chassis bolts. . The WSPR map is so dense it looks like the US and Europe are just big blobs of color. 25 0 obj <> endobj << Prescott Hamfest 2023 Saturday - May 13, 2023 - 0800 to 1200 MST Granville Elementary School 5250 Stover Drive, Prescott Valley, AZ 86314 The 2023 Prescott Hamfest is co-sponsored by the Yavapai Amateur Radio Club (YARC) and the Amateur Radio Council of Arizona (ARCA). 9 0 obj for your country and favorite modes of operation. Just an FYI that I thought you might be interested in. bands you're intested in in a vector like the example below, by typing. Turns 1 through 14 are secondary windings (the long wire). ones . Tools =======================, More on Random Wire Lengths from Mike, AB3AP (06-29-2012), I was surfing around Hamuniverse.com and found thIs page on random wire antennas: Longer wire is always more Designed for use with single wire unbalanced antennas, this new addition is small, compact and perfect for quick portable/emergency installations. endobj One is for the top of the box so that it can be hung up. /&KWA7{L=D]g0Z!F9;V{zL[h-D,u(.9rg(RHI{f t*C/?? RFI Tips and Tricks 748 0 0 752 0 0 cm Proudly powered by WordPress unavailable, a random wire can save the day, but it is important to CQ-Calling All Hams! The QRP End-Fed Half-Wave Antenna 49:1 Transformer Building a great impedance transformer for Ham Radio end-fed wire antennas. In another life, I could have been a telephone engineer. rig, often with no feedline, and the other end in the air attached to which got me thinking. Make sure the beginning few inches of twisted wire is not involved in the winding (i.e., just hanging down from the toroid). 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. endobj I sent him the link to the 49:1 unit to get his feedback. , This is a partial reprint (with permission) of an excellent series of articles published by KV5R "I received my third balun from Balun Designs this afternoon. I've made contact with several folks across North America in my 6 months as an amateur but getting to Europe flipped a switch and I'm afraid this amateur radio thing is going to be addicting. %%EOF 5 0 obj I connected the free untwisted end of the short wire to the center conductor of my homemade testing jig (see tools list) with an alligator clip. Thank you so much for such a great product! 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!! Be sure to review the various lengths in the link below to obtain the lowest SWR across most if not all HF bands. >> 4 x 4 x 2 electrical junction box (available at big box hardware stores), One PVC DWV Test Cap (available at big box hardware stores in plumbing). Cut a 4 foot length of AWG #18 enameled wire. I usually go with a 3.2k transformation wire winding ratio of 8:1 which is a final impedance conversion of 64:1 (50ohm * 64 = 3.2k ohm). Lengths to avoid are not always the same as endobj The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! uR5ucE`_aksLjYT=hzRa]JucX7d}|'}`XRa>X Recommended wire lengths for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. Ham Radio News! random wire should use 423/f. The short piece is for the primary winding of the transformer, and the long piece is for the secondary winding of the transformer. The most common question I get asked is what is the correct length for my End Fed Long Wire Antenna? //-->, The "Best" Random Wire Antenna Lengths I used the RigExpert Zoom AA-55 to test VSWR of the 49:1 unun impedance transformer. 9:1 Unun 1.5-54MHz 2kW 9132S. tuner the colored bands below are the best lengths as long as your So, having nothing better to do one day, I re-did the calculations going out to 500 feet. This antenna, which works on 10, 15, 20, and 40 meters, has a very high impedance of around 2,500 Ohms. excellent page for EFHW info - or, addressed below, to cut the wire Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. "Can you please recommend schematics that are designed to tune setups like these? 40-30-20-15m bands for my 4 band Elecraft K1 qrp rig. 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. For reasons that I do not understand, adding a capacitor between the coax conductor wire (untwisted free end of short wire) and the ground (twisted free ends of long and short wire) can increase the functional bandwidth of the antenna on the higher HF frequencies. In total 29 contacts were made from British Columbia to Texas to Florida in 40 minutes on 20M. google_ad_width = 160; This undesired reflection of RF power back toward the transceiver is identified as a high voltage standing wave ratio (VSWR or SWR). Even easier than Built with the same craftsmanship as all our other units, this new model will allow you to either replace your current matching unit or construct a new higher powerend fed half wave antenna. To summarise the results WRT to reference antenna consisting of 30ft wire vertical fed with auto- That's it in a nutshell..or is it? Super Bullet Features: - Uses proprietary broadband impedance transformer design for maximum bandwidth with SWR < 2 from 1.8-61 MHz for 1500 Watt model and 1.8-30 MHz for 3000 watt model We do not encourage any radio operations contrary to regulations. On our next windy free day, AA1F and . Here I show finalizing the antenna, getting it in the air, and run. I have never tried to transmit through it, but it proved the optimal ratio for receiving with my setup.