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 ...It is a little different for the higher band, with the resistive component of the longer element being a bit higher and its reactance a bit lower, but still, most of the current will flow to the 70cm element. 1. Award. Hi there, I made a …UAYESOK Dual Band Magnetic Mount Mobile Antenna 2m/70cm VHF UHF Heavy Duty Mag Base Antenna PL-259 Plug for Vehicel Truck SUV Mobile Radio Transceiver HT Scanner. 4.5 out of 5 stars. 11. $29.99 $ 29. 99. ... Protect & Build Your Brand; Become an Affiliate; Become a Delivery Driver;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 ...I’ve always wanted to have a go at working the satellites but never wanted to pay out on a dual band antenna. I already have a cheap uv5r radio that’s I’ve s...I mounted a Diamond antenna on my 451 for 2 meter/70 cm on the front bumper using the (painted) tow eyehook. The Diamond antenna doesn't need a ground but in this case the metal bumper provides it. The mount itself is a piece of steel blowtorched into 90-degree submission, with a 5/8" hole for the double-ended SO-239 and 11/16th for the tow bolt.Building a high performance 3 Elements lightweight end mount Yagi antenna for 70cm UHF band centered at 435 Mhz. This Yagi build exhibits a gain of 7.66dBi at the center frequency 435Mhz for use in the Philippine UHF amateur band. Front to back ratio is 18.5dB, Vertical Beamwidth 106°, Horizontal Beamwidth 64°. Just like my […]An antenna for frequency F will also be resonant near F*3, so you may not even need 70cm elements. The different length conductors show different impedances at different frequencies; at a given source voltage you can drive the most current into a conductor when the impedance (AC resistance) is low. The lowest impedance is offered by 1/4 wavThis 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.The dimensions are below: The dimensions of the 2m beam antenna, centered on 144.4MHz. Click for a larger image. Horizontal radiation pattern. Vertical radiation pattern. Elevation plot with the antenna at 5 metres above ground, for example in a portable set-up. Peak gain 17.1dBi at 6°.2m/70cm Dual Band J-Pole by KK4ICE . If you have any questions about this project, contact [email protected]. (Step-by-step instructions with photos can be seen below, following the project description and safety disclaimer.) This is an excellent performing J-Pole type antenna, constructed from readily available materials.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.Just usage rosin-core solder. Do not make use of "plumbing solder", acid-core solder, or pipes paste. The acid in these materials breaks down the solder joint when electrical present go through it. Here is a photo of a 70 centimeters j-pole antenna that I use: This has been up for concerning 7 years. You can see how the pipe transforms black ...Feb 23, 2017 · 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...7. rjm27trekkie. • 4 yr. ago. You may notice that you have a 78:1 ratio for wavelength to tape thickness on 2M and only a 28:1 ratio for 70 cm using these inch thick tape measures. I have had much better results (without having to make corrections) using a 1/2 inch tape measure for the 440 side.In this video I show you 4 different no-solder antennas that I build in minutes from scraps of 75 ohm coax cable. They can be constructed with minimal suppli...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 …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.The antenna can be mounted by clamping the PL259 to a mast or even passing the coax through a 3/4 ID PVC pipe and compression clamping the PL259. Either way let your creativity work for you. If you plan on mounting it outside, apply RTV or sealant around the center pin and PL259, and tape well, to keep water out of the coax.#baofeng #pmr #radioprepersWitam!W filmie prezentuję spontaniczne wykonanie super prostej anteny na pasma które. Możemy znaleźć w najbardziej popularnych rad...In the video I incorrectly state 440cm, this is intended to mean 440 band or 70cm!In this video we will make a yagi for 2 meter and 70 cm ham bandsLink to In...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.Build A 9dB, 70cm Collinear Antenna 70cm, Collinear Antenna From Coax. 440 Mhz J-Pole Antenna plans Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. Author use 1/2 inch copper pipe, and the associated fittings necessary. The dimensions aren't typical however, this is what it took to get its SWR low.Either get/build an antenna for each band or find a design that is resonant on multiple bands. Those are common for VHF+UHF, not sure if GMRS+VHF+UHF is generally available. I've got the Comet GP-6NC for GMRS. It's a really great antenna. I also have the ham version Diamond X-300 for 2m/70cm. While either antenna will work for the other ...The LFA would not have worked in this application as it is heavy and a fairly complex build. It's better for a permanent installation. Six Meter Omniangle 6-meter omniangle along with a 222 MHz omniangle and 432 MHz eggbeater. I have antennas! My first use of the Par Electronics Omniangles was on two meters and 70 cm. They worked great to get ...MFJ Pulsar VHF/UHF Base Vertical Antennas MFJ-1538. Antenna, Vertical, VHF/UHF Base, 70 cm, 1.25 m, 2 m, 6 m, 200 W, Fiberglass/Aluminum, 8.2 ft. Height, Each. Find VHF/UHF Base Vertical Antennas 2 meters Band Coverage and get Free Shipping on Most Orders Over $99 at DX Engineering!Amazon.com: 2 meter yagi antenna. ... HYS Dual-Band 9.5/11.5dBi 100W Yagi Antenna 8 Element Beam 2 Meter/70 cm VHF/UHF Outdoor Yagi Antenna with U-Bolt for 144/430Mhz Ham Mobile Digital Radio/Repeater (TC-YG08UV) ... Protect & Build Your Brand; Become an Affiliate; Become a Delivery Driver;Four Element Yagi Antenna for Ham Radio 70cm Band; MFE-1 End Fed Antenna Tuner; HF Indoor Loop Antenna DIY-Simple & Easy to Build; 6-element Quagi Antenna. Tape measure Yagi Beam Antenna; Ham Radio-A 40 meter folded dipole antenna using w... Building an Air Choke or "Ugly Balun" Portable PVC Conduit Antenna Mast; 2 meter VHF Halo Antenna ...16 Dec 2023 ... DIY Dual Band Aerial. 70cm & 2m Ham Radio. Part 4. Final Test Results. · Comments.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….Antenna, Yagi Beam, 2 Meter/70 cm Wideband, 10 Element, 6.10 ft. Boom Length, 350 W Power Rating, Each. Part Number: CSH-A27010S 3.8 out of 5 starsJul 30, 2023 · HAM RADIO: Easy SlimJim / J-Pole Dual band Antenna Build for 2m/70cm . Thanks to Mike (M0MSN) for this "Slim Jim"/"J-Pole" antenna idea. This dual band (2m/70cm) antenna is easy to build and will give you a bit more gain than a 1/4 vertical whip. This variant of the popular "Slim Jim"/"J-Pole" antenna is suitable for both home and field use.SWR across the 2 meter band is 1.1 to 1.4 with most of the band covered at 1.2 or below and 1.1 or less from 146.0 up. SWR on 70 cm (420-450 mhz) is 1.7 or less through 433.5, 435.5 through 441.5, and 445 through the top of the band. 435 to 435 tops at 1.9 and 442 to 445.5 tops at 2.2. This is with ZERO tuning done, just tested as built and ...Retrieve the Slim JIM loop and begin inserting the disc separators. Insert the element at one hole at a time at the top of L2 then slide it onto L1 until the second hole aligns with the tip of L3. Insert this wire into the second hole and continue pushing to the top of the element. Do the same with the others.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 ...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...I don't believe an antenna tuned for 2m will load up very well on 70cm. It's possible to build a dual-band antenna...you just start with a 2- ...Dipole cst Dipole antenna 70cm Dipole antenna folded. em: talk - Designer Tutorial 2: Planar Dipole Antenna. Lna for all: diy 137 mhz wx sat v-dipole antenna Dual …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. · ...The resonant frequency can easily be tuned by cutting the monopole, while the impedance can be tuned by folding the radials. * Monopole antennas need a ground plane, so you shouldn't use them with a u.fl to SMA cable assembly. Dipole antennas can be used with u.fl-SMA cables. * Monopole antennas can be used with edge soldered SMA-connectors.Dual Band Half-Wave Flower Pot Antenna. ... Dimensions shown are for the (basic) 2m half-wave Flower Pot. The modification involves placing a co-ax phasing sleeve around the outside of conduit, positioned as shown. ... Then check VSWR across the 70cm (430 - 450 MHz) band. Expected VSWR readings will be less than 1.2:1 at band edges and less ...Looking for a great, easy to build VHF antenna? Don't go buy one... build it. This episode of Ham Radio Basics shows you how to build a ladder line J Pole 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...Frequency Range: 144-148Mhz 440-450Mhz. Length: 100". 8 db gain on 440-450 Mhz. 6 db gain on 144-148 Mhz. --------------. Out of curiosity, I wondered how the SWR would look on the GMRS frequencies so I scanned it. I was surprised to find that the maximum SWR was 1.6:1. (See the attached graph). I don't have any GMRS transmitting equipment and ...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 …40m/20m/15m/10m/6m. Trapped Dipole. 150W/200W SSB. 13.1'. 4.3. Diamond ® Antennas are sold through authorized dealers. Contact one of your local Diamond ® Dealers for current price & availability.Northeast PA. Apr 30, 2020. #8. As with the Diamond SG7500 the OP is considering, the NR770HB is also a mobile antenna, and will not do well without a ground plane. The suggested Dr Fong DBJ-1 is about 1.6 meters long, but has similar gain to the Nagoya antenna the OP is using now and WITHOUT needing a ground plane.Option 4: mount it along the truck bed rail all the way at the rear of the truck… old school CB style. Option 5: I've got Thule truck rails (similar to a ladder rack). Made of aluminum and the cross bar is about 4 inches wide. Surely there's a way to mount an antenna to the outside edge of the cross bar.The LFA would not have worked in this application as it is heavy and a fairly complex build. It's better for a permanent installation. Six Meter Omniangle 6-meter omniangle along with a 222 MHz omniangle and 432 MHz eggbeater. I have antennas! My first use of the Par Electronics Omniangles was on two meters and 70 cm. They worked great to get ...Dualband Antenna’s. 2×4 2m/70cm Compact Satt Comm Antenna; 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 …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 …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 …Weather fronts. °C 50 40 30 25 20 15 10 5 0 −5 −10 −15 −20 −30 −40. Live wind, rain, radar or temperature maps, more than 50 weather layers, detailed forecast for your place, data from the best weather forecast models with high resolution.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.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 usingDualband Antenna's. 2×4 2m/70cm Compact Satt Comm Antenna; 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 YagiOne thing that people hate when they have a TV antenna is when it can't get a good signal. Some of you have probably been trying to figure out where else you can mount your antenna...It is a little different for the higher band, with the resistive component of the longer element being a bit higher and its reactance a bit lower, but still, most of the current will flow to the 70cm element. 1. Award. Hi there, I made a super-simple VHF dipole with this design: It works surprisingly well, at least for listening.May 19, 2020 · 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 Vertical AntennasHere 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. F4HWKThis 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...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...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 …Begin by placing the Reflector elements one inch from the end of the extrusion. Asseble the antenna to the dimensions you chose building off of the first reflector. For the 2 meter side leave 1 inch between the driven elements. For the 70cm side leave 1/4 in between the driven elements.This DIPLEXER separates 2m from 70cm on the same coax cable. It allows to use 2 antennas over the same cable and permits transmission on one band and simultaneous receiption on the other band, when connected on the side of the antennas. Or use 2 equipments (one VHF and one UHF) when used on the side of the transceivers. The following data have ...2m-70cm_vertical_lengths. Design I used for my dual band dipole for 2m/70cm - http://www.amateurradio.bz/2m-70cm_vertical_dipole_antenna.html ...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...by N6JSX 08/2013. This is my revised "BASE" 2m/70cm Copper-Pipe "J", a "how-to DIY" with an optional method to make a " PORTABLE" dual-band "J" for hotel travelers, …