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Here are some comments from "electronics unmessed": This video is about building a loop antenna for the 70 centimeters amateur radio band. What I particularly like about this antenna is that it implements a bandpass and a powerful antenna at the same time. The principle of this antenna is actually very simple: A ring with the circumference of ...J-Pole antennas for the 2m and 70 cm (VHF/UHF) Amateur Radio bands come in many sizes, ranging from commercial models based on public service designs to homebrewed configurations using coaxial cable, 450 ohm ladder line, or even TV twin lead. Supporting structures can be anything from PVC pipe to wood, including temporary …Ham Radio 2m/70cm Vertical Dipole Antenna; 15 Metres Simple DX Antenna; Windom Antenna; Is the J-Pole the ultimate 10 meter band vertical ... The Amazing Delta Loop Antenna. DX-Mass Tree Light Dipole; Top 10 easy to build HF wire antennas; How to design and build a 70cm DIY loop antenna; Loop on the ground antenna, is it any good?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….2M Quarter Wave Ground Plane Antenna - Ham Radio - TheSmokinApeIn this video we build a DIY 2 Meter Quarter Wave Ground Plane Antenna. Please leave any quest...A simple ham radio 2 meter and 70 cm antenna for fixed or portable use. For details: http://www.amateurradio.bz/2m-70cm_vertical_dipole_antenna.htmlGet your antenna outside, especially if you are using 2 meters. The shorter 70cm waves have a much easier time getting through window openings than the longer 2 meter waves. There are many simple choices that don't involve trying to put a large antenna on a roof. A magnetic mount antenna for a car placed on a window air conditioner works well.On most of the J Pole designs out there, a choke should be used as close to the feedpoint of the antenna as possible to help prevent rf on the feedline and creating difficulty with SWR readings. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. You should get good results with the choke within 3 or 4 inches of the feedpoint on ...Business education is, let’s face it, finding it hard to keep up with a $3 trillion global tech startup economy that’s booming right now. High-growth companies are time-starved and...The 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 ...Oct 31, 2015. #2. 2 meter antenna. If you want a 2 meter buy or make one. Cut five 19 inch coat hangers, get a male pl 259 and make a ground plane.. One in the top and 4 radials in the other holes at 45 degrees.The half wave 2M version of the Flower Pot antenna is easily modified to a dual band antenna for operation on a band that is the [approximate] third harmonic of the fundamental resonance. [e.g. 145MHz x 3 = 435MHz - that's 2M to 70cm or VHF to UHF] The modification involves placing a coax phasing sleeve of aluminium foil around the outside ...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. · ...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 ...(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 ...I was able to measure 1.3 dB insertion loss through the 2m path and less than 2 dB of insertion loss in the 70 cm path, though admittedly I performed this measurement using a edge launch connector to measure the performance before the enclosure arrived. The next step will be to get this on the air! 2m/70cm Duplexer. 73s,Aug 13, 2021 · HAM RADIO: Easy SlimJim / J-Pole Dual band Antenna Build for 2m/70cm, Thanks to a book I purchased many moons ago, I have found the perfect way to pass a ra...23 Apr 2017 ... VHF UHF antenna basics - DIY antennas from surplus 800mhz antennas for 2m 70cm and dual band · Comments110.The 3 element 2 meter (designed for 146mhz) quad in this project has a very small footprint (boom length) of about 32 1/4 inches and according to the computer guru's out there, it has about 9.45dBi gain with only three elements. 9.45 dBi equates to 9.45 - 2.15 = a whopping 7.3 dbd gain with over 20db front to back ratio and a 2:1 swr bandwidth ...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.Easy to build ham radio dual band 2 meter and 70 centimeter ground plane antenna.The antenna length formulas used in our dipole length calculator are as follows: L = 468 / f. l = L / 2. where: L — the length of the total dipole antenna in feet (ft); l — the length of the arm of the dipole antenna in feet (ft); and. f — the desired frequency. We also used the simple wavelength formula: Wavelength = c / f.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 handling you can use ...

Retevis 144/430MHz Amateur Dual-Band Base Antenna,2m/70cm 7.2 dBi High Gain Base Antenna, SL16 Connector Repeater Antenna for Retevis RA25 RT95 RT97 RT97P Ham Radio Mobile Transceivers (1 Pack) 3.9 out of 5 starsI plan on building single antennas on 2m (10 elements +) and 70cm (14 elements +) for SSB and either singles for FM or perhaps co-phased, not sure yet. I'm ...The N5WVX 2 Meter 7 Element Yagi with a "Twist". The N5WVX 2 Meter 7 Element Yagi with a "Twist". ( Cool Elements) Based on the 2 Meter Beam Project by. Larry Morgan, AG5Z. It's hot weather in Texas in July and Larry Parker, N5WVX, shows us a novel way to make these "cool" elements for a 2 meter Yagi and also his method of building a gamma match.Die Induktivität an J-Antenne Duoband 2m/70cm mit Kabelbindern fixiert. Länge 35mm. Hier der 35mm Stub am Speisepunkt der Antenne. Weil grad keine BNC-Buchse zur Hand war, habe ich das Antennenkabel testweise direkt angelötet. Die Antenne funktionierte auf Anhieb. Leider fehlen mir (noch) die Messgeräte, um auch das SWR messen zu können.

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....Mike calls this antenna the "perfect stealth antenna" for 2m/70cm. Mike does an excellent job of taking us through the design, construction, and testing process for this remarkably simple antenna. ... 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 ...…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. The yellow trace is the VSWR reading from the antenna ana. Possible cause: An Improved Version. (See older version here) 3 element = 7 dBd Gain. 5 element = 9.4 dBd.