%PDF-1.7 %âãÏÓ 25 0 obj > endobj 65 0 obj >/Filter/FlateDecode/ID[57FC9B692A5B484BA9417F19561F3DC6>]/Index[25 85]/Info 24 0 R/Length 162/Prev 1892482/Root 26 0 R ...Six Meter Folded Dipole Antenna; 2 meter/70 cm telescopic dipole, homebrewed; Simple to make 2m/70cm antenna project for portabl... Homemade Full Wave Dual Band Antenna for 2 meter a... MFJ Duplexer-two radios one antenna or vice versa; Idiot's Guide to Wire Antennas; My low cost 10 meter DIY; Ground Radials for …Hi there, G1ZMA kindly decided to build me another antenna for 2m and 70cm and here it is. Amazing what you can achieve with a metre and a bit of old RG58 an...How to build a ham radio tri-band 6 meter, 2 meter & 70 cm yagi beam antenna using an old TV antenna for parts. A simple design using dipole driven elements....The new 2M/70cm has higher gain and is mounted 10 feet higher than the previous antenna. The 6M HO Loop is very narrow-band, but the SWR is nearly perfect at 50.3 MHz, so it will be great for digital and CW work. I did tune to 50.313 MHz and could hear and decode lots of FT8 from stations participating in the ARRL June VHF Contest.build for operating on the 2-meter band. It's ideal for amateurs who can't install antennas outdoors, because this antenna is designed to stick onto any convenient window in your house or apartment. At the core of the antenna are two strips of adhesive copper foil tape. Copper tape is very inexpensive, and comes in rolls just like any other ...I was surprised to discover the 70cm band workable, while this makes sense since 70cm is the 3rd harmonic of the 2m band, the simulation did not hold promise. But sometimes you get lucky if you try. You too can build this 3-element Yagi antenna without fancy test equipment by using accurate dimensional measurements and good construction technique.How to build a ham radio tri-band 6 meter, 2 meter & 70 cm yagi beam antenna using an old TV antenna for parts. A simple design using dipole driven elements....It is estimated that the Slim Jim appears to have about 6dB gain over a 5/8 wave antenna due to the extreme low angle of radiation. (Most of the radiation is directed toward the horizion making the "gain" appear much greater than other vertical type antennas it has been compared to with A/B testing) Editor's note: There are many gain figures ...A really quick antenna for 2 metres and 70 centimetres, made from just 2 metal coat hangers and a small length of strip connector just add the fun.Next time...Find the perfect TV antenna for your home with our top picks and buying guide. By clicking "TRY IT", I agree to receive newsletters and promotions from Money and its partners. I ag...For approx £2.50 you can build a wire dipole for each. It will work, especially if you want to do horizontal polarization ( for low power/SSB/digital) UHV/VHF work. I'm a new operator and I've already got a self-made ground plane for 2m band but I wonder if different designs could be more efficient. Jpole or a….Easy to build ham radio dual band 2 meter and 70 centimeter ground plane antenna.My first dipole antenna with cost breakdown. It comes out to about $40 if you have to buy everything, $12 if you already have some electronic / hobby-type ma...What you’ll need to make a Slim Jim: Some balanced ladder line feeder – either 300 or 450 ohm will do – If making an antenna for 145MHz, then you’ll need a length of 1.5 metres. For other frequencies, use the calculator later in this article. Some co-ax long enough to reach from the base of the slim jim to your radio.If you have an old satellite parabolic dish antenna, you may want to convert it for 2 meter and 70 cm use. James Sanders (AG6IF) shows you how to make the easy conversion in this video. James says this alteration yields a cheap, easy to operate, and "stealthy antenna" for deed-restricted housing. For the latest Amateur/Ham Radio news and ...Step 2: Assemble the Antenna. I followed 2m band specs I found online for the length and spacing of the tape measure pieces. I'm far from the first person to make one of these, and here are the designs I researched: The driven element pieces are connected both to each other with a wire folded into a hairpin shape.Provide detailed measurements so hams without SWR meters or antenna analyzers can build this exact antenna and have it work on generally-useful frequencies. Target best SWR in the repeater and FM simplex regions of 2m and 70cm. Notes on Lengths / Frequencies.Chapter 18. Fig 25—Simple ground-plane antenna for the 144, 222 and 440-MHz bands. The vertical element and radials are 3/32 or 1/16-inch brass welding rod. Although 3/32-inch rod is preferred for the 144-MHz antenna, #10 or #12 copper wire can also be used. Fig 26—A 440-MHz ground-plane constructed using only an SO-239 connector, #4-40 ...I need plans and specifications for this build with respect to the below frequencies. I'm not really interested in the 1/2" copper pipe build but would prefer solid round aluminum, copper stock or perhaps plated 5/8" grounding rod. Transmit Power 50W. * Receive (RX) Frequency Range: 136-174.995 MHz VHF.The antenna is dual banded to operate on 70cm using the same sleeve technique as used on the dual-band basic Flower Pot. This results in the antenna operating with four half-waves in phase on 70cm and provides a theoretical antenna gain of 6dBd on 70. Dimensions shown are for a 1st build prototype from a concept drawing and have yet to be refined.Educators also use FoondaMate to share learning materials with students, and to set and post homework. South African edtech startup FoondaMate has secured $2 million seed funding i...This set me back about 50 euro cents per 2 meter (which means about 0.65 USD for 6.6 feet). I needed 50 cm of pipe in this antenna (2 times 25 cm). Next to this I used 70cm of speaker wire I had laying around and a few tie raps to strap it all together. I checked the SWR with the build in SWR meter of my FT-817. It was all 1:1.1 so perfect!The new 2M/70cm has higher gain and is mounted 10 feet higher than the previous antenna. The 6M HO Loop is very narrow-band, but the SWR is nearly perfect at 50.3 MHz, so it will be great for digital and CW work. I did tune to 50.313 MHz and could hear and decode lots of FT8 from stations participating in the ARRL June VHF Contest.The SWR on 2m is 1.6 @ 144mhz and 2.2 @ 148 mhz following your measurements. Although I can not get anything out of the 70cm side. There is a repeater I can open with a HT with a rubber ducky antenna standing at the antenna location but it will not open it up through the antenna.. I do not have the equipment to check the SWR @ 70cm though.Nov 9, 2018 · =====More information on my website at http://www.fuzzthepiguy.tech=====Here are the measurem...I just finished a dual band yagi (2m/70cm) for about $10 this past weekend. I used KG0ZZ's "$4 Ham Radio Satellite Antenna" design, and it works great! There's an associated video on Dave Tadlock, KG0ZZ's YouTube channel. It provides detailed instructions and a demonstration of its use."A look at the MFJ-916B duplexer with SO-239 connectors (also available with N connectors and also available with an outdoor version). You can use this to connect a 2m radio and a 70cm radio to share a single, dual band antenna, or use it with a dual-band radio to connect to a separate 2m antenna and 70cm antenna. Interesting device!24 Apr 2020 ... 2.6K members. Join. Antenna Building Novice & Expert. 29K members. Join. FT-991A. 3.1K members. Join. Ham Radio Swap - Online Hamfest. 16K ...If you haven't noticed already, I LOVE to build antennas. After building the log periodic, I thought I would try my hand at building a Yagi. I decided to make a 70cm Yagi since it requires less materials, so the cost would be less that a 2m Yagi, which is the ultimate goal. A couple obstacles I had to overcome in keeping the cost down was: what ...Mounted to the horizontal cross piece with 2 U clamps, long legged muffler type clamps. Top of antenna is about one inch below the ridge beam. Bottom of antenna is approx 25 feet above ground level. Using 400 flex type cable (ABR brand from HRO). Just try to keep it away from any metal, vents wiring etc.Easy 2 meter SSB Loop Antenna. Here is a great design and build instructions for a nice 2 meter SSB loop antenna. 2 Meter Halo Antenna by Mike Fedler N6TWW has the detailed instructions on his site. Here are some initial notes from the link... There are two previous versions of my loop antenna that were built before the antenna you see now.A Simple 2m/70cm Vertical Dipole Antenna I have to seal the coax ends before it goes outside. I used all brass to build mine instead of stainless for the elements. ... I am also going to build another one to mount on the overhang on the front of the house so I can use my HT in the living room. My shack is in the opposite corner of the basement ...Dual band Yagi for 2m and 70cm with 4 elements on 2m and 5 elements on 70cm and one feed point, designed by DK7ZB. A great antenna for amateur radio satellit...This document contains the detailed instructions to build a homemade lindenblad antenna using a twin-lead as dipole elements. This document contains 9 pages and includes a detailed construction sequence and some drawings to build this antenna for UHF and VHF ham radio bands. Category : Antennas/Lindenblad.In this video, members of the Stamford Amateur Radio Association W1EE, show us how to build a ZS6BKW antenna capable of covering the 80 to 6 meter amateur radio bands. Here are the guidelines offered by this construction team: "The ZS6BKW is the successor to the G5RV.In this video I show how to make a 2 meter dipole Antenna for use with a HT for a SOTA activation. You don't even have to know how to solder!Check out the Ha...Medical center, clinic Przychodnia Medyczna Medgroup at Lower Silesian Voivodeship, Wrocław, aleja Armii Krajowej, 46f, ☎️ +48 535 03 43 41. Get directions in Yandex Maps.That means you might get away with an antenna the works over the range of two services, like Ham 70cm and GMRS, or Ham 2M and MURS. Manufactures typically spec the usable bandwidth of their antennas at the 1.5:1 SWR points. Practically most radios are OK up to a 2:1 SWR.If we look at the antenna as a 70cm antenna (435MHz), it will be completely different. Here, the piece with an unremovared plastic cover does resonate at about 435MHz. The 2m half wave element is then divided into 3, and the upper and lower part will also resonate at 70cm. These are then each half a wave at 70cm. In this way we get in principle ...April 01, 2024. HAM RADIO: The Coat hanger Antenna 2m/70cm dipole. If you have some unused metal coat hangers in your closet, you can convert some of them into simple, efficient antennas for the 2m/70cm amateur radio bands. In this video, Tim (M0MSN) combines two metal coat hangers and a few spare parts from his ham shack to create a remarkably ...You can actually make a good 2m/70cm antenna that way by using a 2 m dipole and a close spaced 70 cm 1/2 wave element, or two 70 cm 1/2 wave elements one on each side of the 2 m dipole. The radiation pattern on 70 cm will be similar to 3 1/2 wave collinear array and will have around 3 dBd gain.This antenna is perfect for those hams living in the primary coverage area of the repeater for 2 meter use. This antenna is nothing more than the old standby "Droopy Groundplane" and can be used on any band where it's physical size does not pose a problem. Remember that the vertical radiator is 1/4 wavelength long at your operating frequency.Building for 70 cm Cutting elements for 432 MHz Yagis ... On a common build Yagi-Uda antenna all the parasitic elements are 'in line'. They are on same height. ... A method to cut all 8 elements needed for 4 bay of 2m xpol Yagis in one go! Method shown and introduced by Norbert, OE3NFC. Photos on courtesy of OE3NFC - tnx! ...18 Jun 2022 ... I've been wanting to make this video for a while. This little handheld 2m/70cm Yagi is an easy build, and it performs really well on both ...Consider a 144MHz (2m) signal coming in on the antenna socket SK2. The tuned circuit L2/C2 is resonant at 144MHz and. having a low impedance, passes the signal to the 2m output SK1. The tuned circuit L3/C3. being resonant at 433MHz, exhibits a high impedance at 2m and so stops the 144MHz signal from reaching the 70cm output socket SK3.Dec 18, 2008 · A local friend that I told about this antenna project built it today. Took him 45 minutes and cost him $12. Instead of using stainless steel for the elements, he used brass. He also tightened up the gap between the 2m/70cm sections seen in these pictures; the pics were taken before he corrected them. Nice job, Wayne! Here are the pics:Step 4: Measurements. The developed antenna has been measured with a VNA in terms of SWR and S11 parameters. The result shows that antenna has a bandwidth between 419.5 and 451.2 MHz with the respect of SWR of 2:1, which is more than enough for the 70 cm band (430-440 MHz). F4HWK.If you don't mind shifting your DIY attention to a home-brew 6m/10m vertical (perhaps a trap implementation), you might look at a triplexer like this that gives: low pass at <90 MHz for 10/6m; mid pass at 130-200 MHz for 2m; hi pass at 380-500 MHz for 70cm2m/70cm Fietspomp Antenna Voor Binnenshuis door PAØFRI De werking van een fietspompantenne is te vergelijken met dat van een ZEPP antenne. Het kan beschouwd worden als een hele golf (1λ) dipool waarvan de helft (= ½λ) opgevouwen is. ... Build A 9 dB, 70cm, Collinear Antenna From Coax by N1HFX Recently the RASON …Dual Band 2m/70 cm Vertical Ground Plane Antenna. The operational frequencies for this antenna are within the VHF/UHF amateur radio bands; 2-meter band including frequencies from 144 MHz to 148 MHz, and the 70-centimeter band including frequencies from 430 to 440MHz. Because of the dual band capability, this antenna could become your primary ...26 Feb 2022 ... Here are the dimensions for the VHF/UHF ... The only downside to building your own antenna is that you ... This is slightly below the 70cm amateur ...In this video I show how to make a 2 meter dipole Antenna for use with a HT for a SOTA activation. You don't even have to know how to solder!Check out the Ha...Is your Ham Radio HT rubber ducky letting you down? Do you want to transmit a stronger signal to the repeaters? If so, I'll show you how to build a two meter...Ladder Line 2M J Pole Antenna - Easy to Build. Ladder line is heavy duty and can easily handle the 50 watts put out by most mobile radios. A ladder line 2M j pole antenna is a perfect antenna to hang from a tall tree branch to boost your outgoing transmissions and to help you hear weak stations. Watch these videos to get an idea of how to ...Depending on the 2 meter and 70cm frequencies you choose for tuning your antenna, you might have to compromise a little. I got lucky, because I was using 147.060 MHz and 442.100 MHz, which just happened to both yield a length of 19.08 inches for the longer of the two 3/8″ rod elements.Re: Homebrew 2m, 70cm mobile antenna. by knight » 11 Feb 2010, 17:17. First the photo is a heldhold mobile radio and the antenna is for a mobile radio. I am trying to build a antenna for the roof of a car which I did say a mobile car antenna for the roof of a car not heldhold. knight.Many antenna manufactures have their own version of a 2m/70cm antenna that is 1/2 wavelength on 2m, and they all are similar in height, have some type of coil in the middle and a coil at the base. The tram/browning 1180 is inexpensive, but IMHO effective copy. Regards, JB.Odds are there are dozens of HD channels broadcasting over the air in your area right now. If you’re looking to cut the cable cord and save some money, all you need to view them is...Welcome to an exciting new chapter in amateur radio technology! I'm thrilled to introduce the 'Fara-J' - a cutting-edge 2m-70cm ham radio antenna crafted from Faraday cloth.4. Worthy of mention is that 432MHz is a harmonic of 144MHz, meaning that the antenna can be much simpler; if it's (electrically) an odd number of half-waves on 2m, it's also an odd number of half-waves on 432MHz. Share. Improve this answer. answered May 14, 2018 at 1:10.In this video, members of the Stamford Amateur Radio Association W1EE, show us how to build a ZS6BKW antenna capable of covering the 80 to 6 meter amateur radio bands. Here are the guidelines offered by this construction team: "The ZS6BKW is the successor to the G5RV.I got around to building a DBJ-2 Roll-up 2m/70cm J-Pole Antenna yesterday. It's wasn't hard at all. The most difficult part was cutting the sheath of RG58 and RG316 off without cutting the ground braid. The trick was in a video - you bend the coax and just glide a blade over the sheath where it's stretch and it pops open - kind of like ...Here i present the measured SWR of the antenna. As you can see, the impedance of the antenna is very well matched to a 50 ohm system. Between 144 MHz and 146 MHz, antenna has an SWR less than 1.2 . For an SWR of 2, the antenna has a bandwidth from 138 MHz to 151 MHz which is a pretty good result. F4HWKIn this video I've kept the time down to under 5 mins and easy to follow along. In the video I show you my way of building a very inexpensive and easy to bui...Hiking with an Arrow-size yagi, even the split beam is cumbersome. But it is quite effective for hill-topping purposes. Your market would be anyone who hikes up hills with a VHF antenna (so mostly the SOTA crowd). In New England, this is less than 200 people. 2M is ideal, though having the option of 70cm would attract the satellite types.This is also a nice ham project, een small antenna for 2m and 70cm, after using it you can roll-up the antenna, very nice on holidays... I invented a similar system, but completely made of RG58 coax. ... Build a 2 meter 5/4 Wave Antenna by N1HFX This month I decided to build a 2 meter 5/4 wave antenna. This antenna is unique in that it is ...Age : 71. Subject: Homebrew 2m/70cm Dipole Antenna Sun Mar 19, 2023 9:35 pm. Following on from my PMR446 Antenna I decided to try my hand at constructing a 2m/70cm Vertical Dipole Antenna. 3mm stainless steel rod was used for the antenna arms and various other bits and pieces I had laying around in my shed were used to complete …It is estimated that the Slim Jim appears to have about 6dB gain over a 5/8 wave antenna due to the extreme low angle of radiation. (Most of the radiation is directed toward the horizion making the "gain" appear much greater than other vertical type antennas it has been compared to with A/B testing) Editor's note: There are many gain figures ...Dual band antenna 2m 70cm applications: The big wheel is a horizontal polarized omni directional antenna. Perfect gain and swr on both bands. 2m shows a 38.5in driven element but with the bent part the wire would be 57.75in long? It's a really great omni antenna for the 2m band. Source: img.17qq.com. Stacking of big wheel antennas to …Step 2: Design. A: 275.7mm. B: 746.2mm. C: 103.7mm. D: 29.8mm. E: 142.2mm. The construction itself is very simple; measure and cut all pieces to length, sand down the ends lighty to remove any burr, apply solvent and pressure fit. It is worth doing a dry run to make sure all measurements meet above figures before gluing and you may find the ...6 Nov 2020 ... Comments9 · How to Build and Tune a Tri-Band Ground Plane Antenna · Building a ground plane antenna · HAM RADIO: 2M/70cm Skylab Build. · ...Although Varney envisioned his design primarily as a 3/2 wavelength antenna for the 20 meter Amateur Radio band, radio amateurs have used the antenna for multiband use. The G5RV is an excellent choice for the 20 meter band.This is a really easy, fun antenna to build. If you are new to Amateur Radio, or just want an easy to deploy 2 Meter antenna for out in the field, this is a...2×3 2m/70cm Cross Yagi - compact build; Build 3 x 5 2m/70cm Cross Yagi 145-435Mhz; Build the 3 x 5 Elements 2m/70cm Yagi; VHF antenna's. 2 Elements Yagi 144Mhz; 7 Elements Yagi for 146Mhz band build; 2 Elements Yagi build for 107Mhz FM Band; Build the 5 Elements 2m VHF Yagi; Build a 4 elements yagi 157.000 Mhz VHF; Build 4 Elements Yagi ...2 meter / 70 cm Antenna question. I'm getting back into amateur radio after a few years hiatus and I currently live in a restrictive HOA. I'm looking to build a 1/4 wave antenna for 2 meters and 70 cm (rig is a Kenwood 2000, SO239 for each band, hence J Pole is not an option). I have enough room to mount the antennas in the attic and in ...Build your own 2m/70cm 3 Elements VHF by 5 Elements UHF Yagi antenna with excellent gain for both VHF and UHF operation. This antenna is designed for amateur band frequency for both VHF (2m) and UHF (70cm). The antenna has good reflection coefficient and VSWR ratio @ 1.2:1 at center frequency and 1.7:1 at band edge.Build a 3-element Yagi-Uda antenna for 2 meter and 70 cm Amateur Radio bands with low-cost common building materials from your local hardware supply store. This antenna …Step 2: Assemble the Antenna. I followed 2m band specs I found online for the length and spacing of the tape measure pieces. I'm far from the first person to make one of these, and here are the designs I researched: The driven element pieces are connected both to each other with a wire folded into a hairpin shape.As far as the radiating elements they are. 2M=19.5” 70cm=6 5/8”. This is measured from the lowest point of the U to the tip. Where your coax splits and connects to the elements is where the antenna length will be. Leave about 1” gap so you can move them in and out to tune with swr meter. Awesome, thank you.(The 70cm gamma appears to be set pretty much square on out of the box.) I was able to get 2m SWR down to 1.2 @ ~50Ω Z. SWR/Z at 70cm was about 1.5/~52Ω. Once you get the physical dimensions of the 2m element balanced and the gamma slider adjusted to the band space you want, this antenna will serve very nicely for general 2m and 70cm SSB ...Mar 19, 2023 · Those work ok on 2 m but on 70 cm the radiation pattern is terrible. The YT clowns have probably never heard of antenna modeling. A better design is to make a 2 m dipole with one (or two) closely spaced (about 1 inch) 70 cm 1/2 wave parasitic element (also called coupled resonator).