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...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).I tested my antenna on the local N4NRV input frequencies for our two repeaters. With a 50 foot length of RG8, and the antenna 20 feet in the air, SWR was a respectable 1.13:1 for the 147.780 MHz input frequency, and 1.01:1 for the 449.650 MHz input frequency. I was so pleased with my results that I purchased enough materials to construct ...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...Contructing precedure and tune up of a dual band mobile antenna. This antenna is just a 1/4 wavelength resonator for both UHF and VHF band. It provides no GAIN as compared to other multi-section design. VHF/UHF Long Yagi Workshop. Yagi plans and notes for 6m, 2m, 70cm and 23cm. Vertical antenna for 2 mt and 70cm.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 achieve a ...NOTE: Comparative testing of this antenna against one without the "choke" showed that the choke is NOT needed.Homemade vertical dipole for HAM 2 meter and 7...Here's a small 2m / 70cm diplexer that is good for up to 10W of power, perfect for working satellites with a HT. The design comes from KI0AG and was originally published in the November-December 1997 AMSAT Journal. It consists of two Chebyshev low-pass / high-pass filters designed for the 2m and 70cm Amateur Radio bands.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...Or better yet, build one? I'm sure a 40 meter vertical will also receive some FM and vhf signals, as will your 2m/440 antenna, but not well. +- ...Here's another fascinating and easy-to-build antenna idea from Dave Tadlock (KG0ZZ). In this well-organized tutorial, Dave takes us step-by-step through the theory, design, construction, and use of a 2m/70cm vertical dipole antenna. This antenna is perfect for limited space areas or for portable/emergency use in the field.An RF choke can save the day for field radio operations where you do not necessarily control all aspects of your antenna system and common-mode currents can wreck havoc on electronics, and even your fingers! Use an FT-114-31 with six turns of RG-174 or RG-316. You can also use eight turns with an FT-140-43. For more power …Just got my General license to operate on the entire 10 meter band, so I went for a four band antenna such as this and gave it a shot. it's useable on 70cm except near the end of the band, useable on the entire 2m band, but it's not very efficient, useable towards the CW portion as a terrible 6m antenna, and a very narrow bandwidth on 10m ...XM satellite radio has made its way into homes, automobiles and personal audio players, largely on the strength and quality of its reception. Every now and then, XM antennae break ...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.An upgraded version of the Vhf dipole antenna. Now made dual band vhf/uhf by 2 dipoles in parallel. Reflector elements can be added if slight directivity is...309,00 €. Add to basket. SKU: 1370. Reviews (0) 2m-70cm The Best Dual Band Antenna 2m70DX37-2Conn with two separate connectors. Two separate antennas on the same boom. Behaves as two extreme gain monoband antennas. 1500W on 2 meters and 850W on 70cm. 12 elements on 144 MHz and 25 elements on 432 MHz. 2 meter and 70 cm Longest Dual Band Yagi ...I had the opportunity to find some old Camping stools from SAVERS, a local thrift store, so I destroyed them and made a Moxon antenna!I have heard the storie...That is why they are used on satellites. Lots of hams use both 2m and 70 cm QFH antennas - often on the same mast- Just keep them at least a few meters apart - and again- preferably dont use them for transmitting without some kind of relay switch to disconnect a nearby receiver if transmitting. 0. true.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...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! ...Construyo, a Berlin-based startup that offers a “holistic” project management service that connects the architecture, engineering and construction (AEC) industry, has raised €2 mil...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.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.Slim Jim Antenna Project – VU2RMU. 2 Meter Slim Jim Antenna using 300 Ohm Twinlead. Slim Jim 2M Antenna – SV5BYR. L.B. Cebik web site – requires registration (free) Commercial 2M 70cm Slim Jim – N9TAX. 2M Slim Jim antenna using Aluminum Tubing. Some Notes on the Slim Jim Antenna – M0UXB. Slim Jim Build. Handmade Slim Jim Antenna by .n9taxThe first reference that caught my eye was the $4 Ham Radio Satellite Antenna. I saw this web page a couple months ago, and was thinking about building it, but haven’t gotten around to it yet. It looks like a very cool and easy project. One thing I was wondering about is why the 2m and 70 cm elements aren’t perpendicular to one another as ...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 achieve a ...Adjust the tuning screw for maximum reading on the 415 meter. Remove the cavity and connect point X to Y. Set the signal generator to the repeater output frequency and adjust the 415 for a 0 reading on the 20 dB scale. Reinsert the cavity between X and Y and adjust the cavity tuning for minimum reading on the 415.Presentation by Joe EI6EG on the construction of a 2m - 70cm Dual Band "Eggbeater" Antenna.Joe's project design is from an older ARRL book. However, there a...This photo shows the parts of the antenna before assembly. All the soldering is done. Simple Ground Plane Antennas for. 2 Meters, 1.25 Meters and 70 centimeters. Radiator. The completed antenna. This model happens to be the 70 centimeter unit but the only difference between this one and the units for other bands is the length of the radiating ...Thanks to radio amateur Dave Tadlock (KG0ZZ) for this simple, effective VHF/UHF (2m/70cm) ground plane antenna. Most of the materials can be found at the nearest hardware store or building supply outlet. The antenna is perfect for local traffic and ragchew nets, as well as portable and emergency use.Review Summary For : Diamond NR72BNMO 2 meter and 70 cm mobile antenna. Reviews: 22. MSRP: 41.95. Description: It is a 1/4 wave on 2 meters providing 2.15 dBi gain and a 1/2 wave on 440 providing 2.15 dB gain. This antenna can handle up to 100 watts. VSWR is less than 1.5:1. Product is in production.Because the antenna is hand held, power should be kept to less than 10 watts maximum. If mounted and away from people, maximum power is 150 watts. $132.00. 146/437-10 Solid boom without duplexer. Use two radios with this antenna.Build it yourself a Dipole for 2M/70CM - Got time on your hands because of the Covid19 lockdown well time to build.. You can build this anytime Ham Radio 14...7 May 2024 ... Comments42 ; Tape Measure Yagi-Uda Antenna 2m/70cm DIY: A inexpensive easy alternative to the usual build. Ham Radio Rookie · 12K views ; Raddy ...Here are some of Mike's comments. 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 coax traps on the DX commander I do hope you enjoy it and subscribe for more.. Many thanks Mike - M0MSN To get notified of the next upload .click that ...The basic "J" is reported to have >3dB of gain over a ¼ λ ground plane antenna and 6dB over an isotropic (theoretical) antenna. The "J" can be made from almost any material: copper pipe, steel whips, TV twin-lead, ladder-line or metal rods. Technically, the "J" antenna is an end-fed ½ λ antenna that uses a ¼ λ matching stub. Old-timersThe Diamond X-200N 2m/70cm Fixed Station Vertical antenna is constructed from fibreglass, ensuring durability and longevity. This model comes pre-tuned and fully weatherproofed, making it suitable for various environmental conditions. Installation is made easy and efficient with a coax connection via an 'N' socket, which includes mast mounting brackets.Operating on frequency bands 2m/70cm, the ...So I built a simple flower pot antenna from PVC pipe and coax. My First Antenna - A Dual Band (2m / 70cm) Flower Pot Antenna. I've bought a few whips for my HTs and thought it was about time I made an antenna of my own. Obviously, the place to start was a dual band UHF / VHF antenna. Design. I picked the flower pot antenna based off the designs ...I'm confident you will find this portable "J" to far exceed any other antenna, in the same setup, to more than tripling your 2m & 70cm (440MHz) performance! Here is a step-by-step to make a portable (or base) 3/4 inch copper-pipe "J" that breaks down into four (~24" long) pieces for easy transporting. This design uses a Bungie-cord to keep all ...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.May 2, 2023 · To make the Eggbeater antenna project even easier and more cost efficient, I decided to build the Eggbeaters myself, but to design the 70cm Eggbeater dedicated for the downlink and the 2m variant for the uplink. This post is about building the 70cm antenna. These two excellent documentations by ON6WG and F5VIF served as a basis for the ...The top part of the main element was the 70-cm j-pole and was fed via coax through the main element. It literally looked like a cactus and had some variations including 1.25-meter (tri-band). The "super" j-pole is a co-phased 1/2-wave over 1/2 wave, and can perform accordingly, but as with all j-pole designs, has an irregular radiation pattern.The Connect at measurement is 1 1/2 inches from the top of the horizontal member to the point of connection. The distance between the main element of the j-pole centerline and the tuning stub centerline is 0.75″. Pages: 1 2. Filed Under: antenna, Ham Radio, WB8ERJ Tagged With: 70cm, Antenna, DIY, Ham Radio, J-pole, jpole, wb8erj.The more common coax collinear requires a PVC radome to give it rigidity and weather proofing, and assembly can be difficult. The 2 - 440 Collinear vertical in this project is simple to build and expand, semi rigid, self supporting, water tight, electrically sound, and a professional appearance when completed.That is why they are used on satellites. Lots of hams use both 2m and 70 cm QFH antennas - often on the same mast- Just keep them at least a few meters apart - and again- preferably dont use them for transmitting without some kind of relay switch to disconnect a nearby receiver if transmitting. 0. true.For VHF or UHF antennas, the solution is fairly simple. Since these antennas are short, they can be mounted at the back of the house where they cannot be seen from the street. A Comet GP-1 base antenna, at just over 4 feet high, can be easily placed on the back side of a roof and give you good 2m/70cm coverage.Some ideas for alternative materials and design considerations around a 5 elements yagi for the 70 cm band.Measurement and adjusting.A DIY lightweight 2m Moxon antenna. Here is a rough guide to my home brew 2m Moxon (According to some old kitchen scales it weighed in at around 160g, my luggage 'scales' said .2kg, but it only shows up .1kg units ) I built it to take to ZL and VK, so the dimensions were for frequencies a little higher than the UK, although it seems to work ...Bandwidth is normally 10 MHz on the 70 cm (440 MHz) band and 25 MHz on 23 cm (1200 MHz), making the antenna an excellent candidate for ATV repeater use. Many improvements have been made since my original article "Omni-Gain Collinear for 70 cm and 23 cm" was first published in the May 1982 issue of 73 magazine. Concept of ConstructionI created a video a few weeks ago showing how to create a 4:1 BALUN using coax. In this video I created a 4:1 BALUN for the Amateur Radio 2-meter band, cent...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, 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. ... 2m/70cm Ground Plane Antenna; The NE0U 160m EZ-L Antenna at WX0V; Tri-Band Fan Vertical for 40-80-160m; Ham Radio EME with a portable small …If you build the antenna as shown, the computer model predicts 11 dBi gain and a front-to-back ratio of 20 dB. ARRL Lab measurements confirmed the computer-predicted antenna pattern. You may wish to read further about tuning adjustments in The ARRL Handbook. It describes how to check the antenna with a field-strength meter, or by usingThe 70 cm phasing line is (13.5 cm) long and the 2 meter phasing line is (41.5 cm) long. Cut the RG-62 about (5 cm) longer than these measurements and leave (2.5 cm) at each end to strip the insulation, peel back the braid, strip the center conductor, and attached the ring lugs.This is post 2397 in a continuing series of simple ham radio antennas. Thanks to Dave Tadlock (KG0ZZ) for this simple 2m/70cm vertical dipole antenna project. This antenna is perfect for deed - restricted housing and field operations. Also, Dave provides a link for more details on the antenna:This Parts item by BarberTechnologies has 244 favorites from Etsy shoppers. Ships from Warren, OR. Listed on May 16, 2024.To construct the antenna, first select a suitable length of grey 25mm conduit (as a minimum 1m but if you make it longer, you will have more room below the coil to attach to your antenna support). Basic arrangement of the 2m Half-Wave version. Drill two holes into the side of the conduit for the choke coil. The ‘top’ hole will be approx ...Here is a simple 2-element quad for 2m that is easy to build and does a good job. It works well for extending the range of an HT, transmitter hunting, SSB, or general use. When not in use it comes apart for storage. The SWR is less than 1.5 : 1 across the band from 144 to 148 MHz without any tuning. The boom can be rotated for …Build a 2m VHF lightweight sleeve dipole antenna. A compact portable antenna and easy for deployment. You can even operate the dipole while holding it. Building it is easy just follow the antenna plans below. The antenna specifications are below including the testing video. Wiring the Feedpoint. Antenna Measurements.TWAYRDIO Yagi Ham Radio Antenna,Dual Band 2m 70cm VHF UHF Yagi,High Gain 8 Elements GMRS Vertical Base Antenna for Repeater System,HT Scanner,Satellite Work. dummy. SMA-24 SMA24 SMA 24 SMA/24 SMA(24) Original Comet Dual-Band 2M / 70cm HT Antenna SMA-Male. dummy.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 ...Now its time to add the additional elements to the top and bottom of the collinear array. First add a ¼ wave element to the top of the antenna as shown in Figure 3. Use #16 solid wire or similar and solder it to the center conductor only. The length of the ¼ wave element is calculated as follows: 1/4 wavelength radiator = 300 / F / 4.Lower Silesian Voivodeship. Lower Silesian Voivodeship (pl: województwo dolnośląskie [vɔjɛˈvut͡stfɔ dɔlnɔˈɕlɔ̃skʲɛ]) is a voivodeship (administrative province) in southwestern-Poland, encompassing much the historic region of Lower Silesia, from whose Polish name ( Dolny Śląsk) its name is derived.Jun 24, 2020 · Created by Mike Sanchez on 2020-06-24. A Covid-19 Dual Band 2m/70cm Antenna for $9. 5.37 dBi (2m) and 7.39 dBi (70cm) at 14 ft. The Origins. In 2012, as I re-entered Amateur Radio, I dug out my old Yaesu FT-5100 that covered 2m/70cm bands for FM.DIY Build instructions Dual Band 2m/70 cm Vertical Ground Plane Antenna Coastal and SLV ARES Amateur Radio Emergency Service Page | 1 The operational frequencies for …The antenna is constructed from M4 stainless steel threaded rods, as they are relatively inexpensive and common place at most DIY stores. Additionally, it is an easy material to work with and does not require any special tooling. The boom is constructed it from 10mm2 aluminium box section, again it's cheap and stocked in most DIY stores.2m/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 …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:The large square with 28 cm edge length covers the 2m band in the frequency range of 140 - 150 MHz, the smaller one allows operation on 70cm from 400 - 470 MHz. The signal direction corresponds to the open side of the loop element. The 50 ohm supply with up to 800 watts is provided by a PL/SO239 connector.I show how to use stainless steel TIG welding rods (can be done with other materials as well) to make antenna elements for home built 2m / 70cm antennae such.... This time, Dave uses common materials from around the house anI was able to measure 1.3 dB insertion loss through the 2m path and 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 ... For approx £2.50 you can build a wire dipole for each. It will DIY 2m/70cm Antenna That is Better than What I Have? Right now I have a TWAYRDIO 20m/70cm Yagi that the manufacturer claims to be +9.5 dBi for VHF. I'm not sure how accurate that figure is, it seems a tad optimistic; but I'm happy with the antenna overall. I can hit all of the nearby repeaters near me, except one. HYS Amateur Dual-Band VHF & UHF Magnet Base Antenna for 2m/70cm M...
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