Dual band 2m 70cm slim jim antenna plans

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comparing 2 meter J-pole on fundamental and on third harmonic frequency (70 cm), with the antenna mounted 8 feet above ground. Most of the energy at the third harmonic is launched at 44º. Figure 3 — The original DBJ-1 dual-band J-pole. The dimensions given assume that the antenna is inserted into a 3⁄4 inch Class 200 PVC pipe. pdzlzn
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I decided to try building a 70cm Slim Jim Antenna in this video as well as give a channel update.

The antenna costs almost nothing to construct and should handle up to 50 Watts of power. The antenna is broad-banded and should therefore provide a low SWR across the entire 2-meter band. A J-Pole antenna is a half-wave vertical fed at its base through a shorted quarter-wave stub acting as a transformer matching section.

Jun 15, 2014 · Update: I have had an opportunity to use an MFJ-259 SWR Analyser to run a few very quick tests on the antenna. The results showed a good match on 6m, on 4m resonance was right at the bottom of the band (ideal for DL band plan 🙂 ) and on 70.200 MHz the SWR was measured at 1.5:1 I believe this “shift” is due to adding the PVC strips.. "/>.

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Search: Uhf And Vhf Antenna. This antenna has a signal range of up to 45 miles and will pick up available local channels from 174 to 216 MHz and 470 to 700 MHz For instance, Channel 2 in the North American television frequencies is at 54 MHz, which corresponds to a wavelength of 5 UHF Loop Antenna— rotates about 340 degrees for the best UHF reception Homemade 1/4 wave.

comparing 2 meter J-pole on fundamental and on third harmonic frequency (70 cm), with the antenna mounted 8 feet above ground. Most of the energy at the third harmonic is launched at 44º. Figure 3 — The original DBJ-1 dual-band J-pole. The dimensions given assume that the antenna is inserted into a 3⁄4 inch Class 200 PVC pipe.

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(It could be a ground rod or an antenna, like a Beverage or large loop, the antenna does not have to be an "open circuit" If f = 434MHz then this is 346mm, applying 0 build fringe vhf tv antenna 11 plans vhf/uhf 144/440 dual band collinear base antenna uvs300 Sep 28, 2018 - This Pin was discovered by Pedro Lissette Sep 28, 2018 - This Pin was.

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1. Dualband Antenna 2meter 70cm Mobile VHF/UHF Ham Radio (137-149, 437-480 Mhz) Mag Mount Magnet Base PL-259 Connector, 10 Ft RG58 Cable. Features : Include: X1 18 inches Dual-Band VHF & UHF Antenna, X1 10 Ft RG58 Cable with PL-259 Connector and Magntic Base. Fastly Installation: 2.95″ Strong Rare Earth Magnet Base.

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Example: screw in 80,40,20 meter hamsticks and a dual band 2M/440 MHz whip (two on each band) on opposite sides Description The 2 meter J-Pole works great on the 70cm band as a dual band antenna, but sometimes you may want a 440MHz dedicated antenna A 40mtr antenna for small spaces For my delta loop that meant the wire would have to be about.

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.

•Bob K9TMU's Slim Jim •Variation on J-pole •dual band •easily built from a piece of 450 ohm ladder line . ... NVIS or "cloudwarmer" antenna. Vertical Square loop ... W3GQ (now K4FAN's) Lightning Bolt Quad 20-6m, 2m Quad at the top Better performance at lower heights, but fragile . Log-periodic Antenna.

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Search: Collinear Antenna Design Calculator. Building a Coaxial Collinear Antenna Discussion Vertical antennas "with gain" are usually pretty tough to build utilizing tools found around the average home If you use it outdoors, waterproof the coax well with self-sealing tape The stub will be coilled up, so calculate your 1/4-wave and multiply by 0 Omni Antenna How tos: ADSB antennas: Collinear.

Gordon Gibby July 15, 2016 TWO METER HOMEMADE SLIM JIM ANTENNA WIRE: Start with a piece of solid #14 AWG household wire approximately 3 yards The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for Public Service WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole.

(It could be a ground rod or an antenna, like a Beverage or large loop, the antenna does not have to be an "open circuit" If f = 434MHz then this is 346mm, applying 0 build fringe vhf tv antenna 11 plans vhf/uhf 144/440 dual band collinear base antenna uvs300 Sep 28, 2018 - This Pin was discovered by Pedro Lissette Sep 28, 2018 - This Pin was.

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1090 MHz Franklin Collinear If you desire a Cardoid pattern, or if your only option is side mounting, You may use a value between 4 and 36 L = Length (feet) of a 1/2 wave ant ) If you would rather calculate the length of a full-size vertical antenna, see The Quarter-Wave Vertical Antenna ) If you would rather calculate the length of a full-size.

Description. OSJ 146/440. Dual Band - 2 Meters & 70 cm - Solid Aluminum - End Fed (SO239 Connector Only) OSJ 220. 220 MHz. End Fed (SO239 Connector Only) OSJ - VHF. Wide Band Width (150 - 162 MHz.) Solid Aluminum - End Fed (SO239 Connector Only).

Dave's J-Pole Antenna Calculator . Enter your desired frequency and get the calculated lengths from below. For example, if you wanted a general J-Pole for 2 meters, you might enter the center of the 2 meter band which would be 146.00 mhz. If you predominately used the upper side of the 2 meter band you might put 147.00 mhz.

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After the holes are drilled, file the opening flat for a better band clamp fit. 8. After the best match has been found, you may want to solder the SO-239 and the stranded wire end to the 1/2″ tubing. 9. When the antenna has been cleaned and matched, spray the entire antenna with a coat or two of clear lacquer to keep it looking nice. 10.

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November 20, 2018. This antenna with the adjustable plate for tuning can be built from type M 1/2in copper tubing for around $13 and the coax pig tail would cost around $12. The antenna, not including the coax would cost approx $25. In the picture above I used hose clamps to clamp the coax pig tail directly to the antenna.

Dimensions Of The Finished Antenna. You could do without a antenna analyzer if you build your six meter folded dipole antenna system with the following dimensions: ==> Six meter folded dipole made of 450 ohm ladder line, #16 7 strand copper clad steel wire : 8.66 feet (2.64 meters) long. Resonates at 50.4 MHz.

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Description. OSJ 146/440. Dual Band - 2 Meters & 70 cm - Solid Aluminum - End Fed (SO239 Connector Only) OSJ 220. 220 MHz. End Fed (SO239 Connector Only) OSJ - VHF. Wide Band Width (150 - 162 MHz.) Solid Aluminum - End Fed (SO239 Connector Only).

Quarter Wave Dual Band VHF/UHF Ham Radio Antenna: A Simple & Cheap Dual band antenna will save you having two different antennas for UHF and Binnenshuis fietspompantenne 2m-70cm. Slim Jim vs J-Pole Antennas - KB9VBR Antennas. On my site you can find both the all copper 2.

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antenna is a Dual Band 2m- 70cm J-Pole “Roll-up” Antenna. This is Dual Band 2m-70cm J-Pole Antenna that can be “Rolled Up” and conveniently transported in you Go Kit and un-rolled when on site. At you station at home the antenna can be mounted vertically in your attic of framed and displayed on a wall in your home as “Functional Radio.

The name Slim JIM was derived from the J-Pole but improved by the developer of the antenna. It was called "Slim" because the antenna does not loop of the Slim Jim and with the dimensions as shown (A ½ inch diameter drill bit was used as a jig to make the rounded corners when looping the wire).

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The Super J-Pole Antenna(Collinear Design) ... X-30 N 2M 70CM dual band collinear antenna aerial pmr 446 PMR446 If the SWR is greater than 2 to 1 across the entire band, a connection may Since I spent a whopping $12 on the USB dongle, I sure didn't want to spend very much on the antenna So our Coaxial Collinear Antenna is essentially an array.

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After I got and finally installed my ICOM 2300A 2m mobile, I needed at least a 2m 'mobile' antenna: I made a Dual Band 2m 70cm "Slim-Jim" (modified version of; I also wanted to use it for 70cm on the Yaesu FT-857D when parked at home or camping) The Slim Jim antenna was constructed with 3/4" PVC and Stranded # 14 THHN wire for the 2m element.

Search Newegg.com for dual band antenna 2m 70cm. Get fast shipping and top-rated customer service.

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Ground plane antennas are easy to recognize by their appearance. First off you'll notice the radiating element. This element is 1/4 wavelength long, or about 19 inches for the 2 meter band. Next up are the ground radials. a ground plane will often have three or four radials, each 1/4 wavelength long.

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Don Murray W9VE Building a Dual-Band Antenna Mentorfest 10/23/04 13 Steps to Success 1. Drill the bracket. 2. Measure and Saw the all-thread. 3. Mount antenna mount on bracket. 4. Mount bracket to conduit. 5. Install 18-inch all-thread. 6. Use SWR meter to adjust all-thread and position of bracket on.

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11 years ago
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Despriction: Slim Jim / J Pole Antenna Calculator - M0UKD. This calculator can be used to design a Slim Jim or a J Pole antenna.The Slim Jim, designed by the late Fred Judd, ... Ed Fong PVC Dual Band J-Pole - AR15.COMFeb 18, 2012 · It is a standard VHF j-pole that resonates at UHF. This calculator can be used to design a Quarter Wave Ground Plane.

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11 years ago
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Copper Cactus Dual-Band Super J-Pole Antenna Projec t Your going to like this super J-pole project, This home made j-pole is easy to build and sturdy, While looking for an jpole antenna project to build I remembered seeing a Marine antenna called the Super J-Pole in the 1988 ARRL >Antenna</b> Handbook, which claimed a 6 db gain over a quarter wave.

Slim Jim 2M Antenna - SV5BYR [1] This calculator uses a method Calculator for string tension for guitars or basses Coax collinear Antenna dimension calculator Back to Antenna calculator overview NEC Develops mmWave Distributed Antenna Radio Units to Improve Indoor 5G Performance - Jan 27, 2021; MACOM - MACOM Signs Co-Operative R&D Agreement.

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11 years ago
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Truck is going to have to take a 9 month break but I have big plans for it after that. Scored a power steering rack for $180, adding that to the pile.

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11 years ago
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aircraft band jpole Antennas ir duelband JPole Antenna made in the UK by SuperYagi Antennas. This is a far superior quality antenna professionally NEC computer designed for unmatched performance each hand made tailored Ideal long range air band reception antenna.Superyagi designed Jpole antenna for the VHF bands Covering from 125 127 mhz airband comercial with secondary millatary 300mhz band.

Slim-Jim 2m VHF Band Antenna by 4S7NR Slim-Jim is easy to built, no radial 145Mhz antenna. It has almost equal gain of a 5/8 lambda and much higher gain than 1/4 lambda whip.

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11 years ago
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I then began research on what it would take to make this antenna perform well on 2m and 70cm. What I came up with was a trapped end fed folded dipole. The antenna acts like a slim jim on 2m and a jpole on 70cm. The secret formula I will leave for the history books. But this design yields excellent results compared to many other dual band antennas.

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11 years ago
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Search: Collinear Antenna Calculator. What is Collinear Antenna Calculator. Likes: 600. Shares: 300.

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11 years ago
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5 GHz are (gain of 8 The end attached to the house will be mounted just underneath my existing tri band collinear Popular Coins Adrenal CT Washout Calculator Using an antenna analyser a low SWR was seen at 7 Using an antenna analyser a low SWR was seen at 7. Background Various Hello Antenna Products Customers, We would like to update you on.

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10 years ago
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Welcome to the diamond antennas 2m | 70cm | vertical antennas page. Here, you'll find links for high gain antennas covering hf-vhf-uhf. In addition, specific models mentioned in the antennas forum like diamond antennas and more are here for future reference. Amateur radio antenna sold here,we update our stocks to keep in touch with modern improvements in antenna design, ham radio shopping.

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10 years ago
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10 years ago
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LoRa/LoRaWAN tutorial 46: Collinear Antenna Diamond X-400 Antenna (2m & 70cm) I now use a Diamond X-400 collinear antenna for 2m and 70cm, having recently upgraded from a Diamond V2000 tri-band 2m, 6m and 70cm Theory: on each side, you bring two 50 Ohm lines together in parallel bringing the impedance to 25 ohms After removing the outer jacket, start bunching the.

Slim Jim Info. Enter the Dual Band antenna. After many requests for a dual band version of this antenna. I searched the internet and books high and low to no avail. I then began research on what it would take to make this antenna perform well on 2m and 70cm.

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9 years ago
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Reply to  Robert Farrington

The Slim Jim antenna is a flexible antenna made from ladder line. The two ends are soldered together to make a loop and a small gap cut out of one side of the ladder line, the Coax feeder is then soldered to the ladder line to make a flexible antenna. Designed normally for 70CM (UHF – 440Mhz) and 2M (VHF – 145Mhz), these cheap, easy to make.

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10 years ago
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9 years ago
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Example: screw in 80,40,20 meter hamsticks and a dual band 2M/440 MHz whip (two on each band) on opposite sides Description The 2 meter J-Pole works great on the 70cm band as a dual band antenna, but sometimes you may want a 440MHz dedicated antenna A 40mtr antenna for small spaces For my delta loop that meant the wire would have to be about.

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Antenna Round Up — antennas for 6, 10 & 2 meters Antenna Theory 101 — antenna tutorial from KD4SAI Antennas from K5DKZ Antennex — online antenna magazine Attic Antenna — trap dipole design for your attic . B . ... Bazooka Antenna Design — from WE6W Beverage— a short beverage design by K3KY Broomstick Special: — compact, easy-to.

The Slim Jim built with ladder line is light, portable, cheap and quick to make, what's not to like? You are watching me set up a Slim Jim 2 Meter ham radio antenna a friend of mine made. The original Ed Fong Dual Band VHF/UHF 70cm/2m J-Pole PVC Pipe Antenna : Eye-On-Stuff Please consider.

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9 years ago
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Dual Band 2M / 70CM Stainless Steel J-pole Antenna, Made in USA. PG1N's HAM Radio Site - 70cm Projects - Directional Antennas. J-Pole Base Antenna 2 meter 70cm Dual Band Heavy Duty Amateur Ham Radio ... LY3LP laboratory: Lazy H 2m 70cm dualband satellite antenna.

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8 years ago
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7 years ago
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If the SWR is greater than 2 to 1 across the entire band, a connection may The ideal antenna for such a situation is a dish, such such as the Primestar dish 762-870 MHz 3dB gain, collinear through-hole mount antenna This page is the first part of my VHF Collinear antenna project, wich gives a gain of about 5,1 DBi with 2 dipoles and 8,1 DBi.

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1 year ago
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