-Dave K7TRF, Jan 14, 2016 #3. This type of ground is achieved when an antenna … N4QT, Jul 27 ... so I use a SO-239 to 3/8x24 adapter (CB stud type) and a small piece of 3/8x24 "all thread" and then attach the antenna. A ground plane has nothing to do with ground as in electrical ground. Lower radiation resistance means less signal output and input. Adding this ground made it easy to get excellent SWR readings with both 3’ and 2’ Firestik antennas. Install the PL-259 coax connector on the far end of the coax. That said, as mentioned above, GMRS not as sensitive to this as is the CB frequency spectrum. The ground plane style of vertical antennas utilize radials that extend out from the base of the assembly to help lower the angle of radiation. Likes Received: 2,269. Add ground radials to it and you have a 5/8 groundplane. A no ground plane antenna is designed to use the ground or water to transmit horizontally. A No Ground Plane antenna will not perform as well as a traditional CB antenna of the same length, but in situations where you do not have an adequate ground plane such as on a boat, RV or motorcycle, they do the trick. Ground Plane enhancers are not designed to be the sole ground plane for an antenna, … A mobile antenna should be placed in the middle of the vehicle roof to make best use of the ground plane. Ground plane reliant antennas need a good chassis ground at the mount. £17.50. • At least 20 feet of 50 ohm CB Antenna coax (WITH PL259). Gain is about 2 dBd 15 degrees above the horizon. Incidentally, the term ground plane is a bit of a misnomer (see next section). A Ground Plane with One-Quarter Wavelength Radials Or Half-Wavelength Diameter A ground plane for a CB radio antenna is the metal surface required below the antenna. A budget ground plane kit for converting mobile antenna to home base use by providing a ground plane. A 5/8-wave vertical without any ground plane radials under it will have LESS gain and far less performance than a standard 1/4-wave ground plane with radials will. The kit is fine if you just want to use the antenna for 10 and 11 meters. Popular . Individual Mounts and Ground Radial Sets. The antennas are manufactured here in the USA. On the other end, or the bell end, secure the PVC electrical box with glue. The metal surface enables the signal generated when transmitting to reflect off the surface and travel into the atmosphere. An simple and easy to make antenna width a good band width. The coaxial coil at the bottom works like RF-choke for the optimum decoupling from mast and feeding line. CB radios use a frequency band of 27 Mhz. After one beam or ground plane is completed, mount the antenna where it will be mounted on the house. They screw into a bracket that mounts onto the antenna mounting bracket. I've heard people in the past using 102 whips as base station antennas, and they did it by having a ground plane made up of horizontal wires on 4 sides under the antenna. The formula to figure the starting length of a 1/4 wave antenna is 246 / frequency in megahertz. Tram 1499 CB Base Antenna. As a matter of fact, when checking to make sure your mount is grounded, remove the coax from the radio to eliminate possible errors. using a 102" SS whip.https://paypal.me/MowerJunkieCBradios?locale.x=en_US By using the very flexible and coated solid Hf Multiband Vertical Convert A Cb Antenna Into 6 Band. M0LEP Ham Member QRZ Page. The I-MAX 2000 has a ground plane radial kit available. To function as a ground plane, the conducting surface must be at least a quarter of the wavelength (λ/4) of the radio waves in radius. For Base-Loaded Antennas: If you're using a base-loaded magnet, trunk-lip or roof antenna, taking a measurement from the grounded mount will be more difficult, as it's usually on the bottom of the antenna and flush with the vehicle's surface. "Ground mounted" means that they are only 0.02 wavelength above earth level. An antenna's ground plane should be at least 1/4 the wavelength of the signal being broadcast. Your best bet would be to use those brackets with the longer Comtelco whip antenna. Connect the ground plane in the center to the outer metal conductor of your vertical antenna. I just like building things and thought I would try to build an antenna for my CB radios. It consists of 4 fiberglass radials at 70 inches each. This includes, but is not limited to, motorhomes, boats, automobiles and 18-wheeler trucks. If you adjust the length of your antenna and have a good ground plane and still cannot get the SWR reading down then you may need to reposition your antenna on your vehicle. 146MHz 5/8 ground plane tower mounted antenna. A metal roof near an antenna can cause it all sorts of trouble. The driven element is often 1/4 λ long and the frequency is often between 10 and 512 MHz. Build a CB 11 metre 27 Mhz No Capacitor DDRR Antenna Quarter Wave Vertical Performance but LOW Noise (DIY in 30 minutes) Below is a shot of the original Mag wheel I had my 9 foot Whip on which is clamped to the iron roof and quarter wave whip now removed and the RG58 Coax fly lead PL259 is reconnected into the new CQDX11.com Design DDRR antenna. If you can a install the antenna mount to a metal, grounded component of the vehicle there is at least a chance that you could make a normal ground plane dependent system work. A bad ground will result in an un-tunable antenna and sky-high SWR levels. A mobile CB antenna uses the car body as the ground. The one pictured below is for receiving ADS-B aircraft signals on 1090MHz, again using scrap copper, but this time a … Wrap one end of the copper wire around the base of the antenna mast. The ultimate to 11 meter cb antennas cb radios citizens band for 102 whip base install worldwidedx a no ground plane antenna 11 meter cb antennas 2mt454. Phased Two CB Antenna System You might also consider a phased two CB antenna system to give an additional 3dB of gain. You can purchase "co-phase" coaxial cable assemblies, or make your own using a coaxial cable T-connector and two equal lengths of RG8AU coax. Bigger is better. Home > CB Antennas > Magnetic Loop Antenna Homemade Magnetic Loop antenna for 27 MHz. But yes, a metal roof can form some or all of a decent ground plane for a vertical. In case you can mount your CB antenna in the right place, you can get up to 20-25 miles. When shopping for a magnetic mount antenna you might well benefit from a unit that keeps the Capacitive reactance below, say, 10% of the antenna impedance. Comments. And Tricks On How To Build Your Own Cb Antennas. Ground plane is a metal surface that is placed below the coil causing the signal to go up to atmosphere. 'No ground plane" (NGP) CB antennas with NGP coax were specifically designed to solve the problems associated with the lack of ground plane (counterpoise). On this CB Antenna, the four radial wires are used as the ground. My inverted-V at 40 ft. performs well, but is “a cloud burner,” good for local contacts within 500 miles. Make sure solder … How to ground an antenna Antenna RF ground Antenna ground plane Knowing how to ground or earth an antenna system can be a key factor in the operation of some antennas. A car roof is a great ground plane. The Ground Plane Kit. "In effect a mobile CB antenna is only half the equipment needed to transmit a signal, without a sufficient groundplane an antenna will not work very well at all." Solder a PL-259 to the ends of the main coax. You can pick one up at Radio Shack or your favorite Electronic Supply. The trick is getting the feedpoint to match with the feedline. This is mostly during cases when there is no ground plane. The no ground plane antenna for all applications is versatile. This calculator is designed to give the vertical length (height) of a quarter wave ground plane antenna, and the length of each of the four radials (often called radiators) for the frequency chosen. You cannot use the ground path supplied via the coax cable. Get it at Radio Shack or a truck stop; they are big CB fans and the stops sell this cable with the PL259 already installed. Ground-plane mirror cb aerial mount Kit for Fibreglass Cabs counterpoise. Pre-SWR'ed Antennas. Build one antenna at a time. You can add length in the antenna by taking it to the manufacturer. If I go this route can I use copper wire as the ground plane? Either as an independant ground plane (isolated center/braid), or a pole type where the center and braid are connected via an impeedence circuit simular to what is found in an ex. At VHF/UHF frequencies, this effect is adequate for good results which explains the popularity of these mounts. Figure 2: Height: 0.02 wavelength (0.5m at 14MHz). Plug the Pl-259 into your CB Radio Antenna Connector, (SO-239) and mount the 20ft PVC Pipe Vertical, at the bottom, and start talking. 2. Wilson (305-430) - No-Ground Antenna Kit, Slide to Tune Coax, Fiberglass, 3ft, Black, 300 Watt, 26.75-27.75MHz Description: This "No Ground" antenna kit was specifically designed to solve the lack of ground plane problems found on vehicles constructed of plastic, fiberglass, wood or aluminum. If you make the ground plane radius the same as the height of your antenna or a little longer, that should suffice. The normal quarter wave ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. Flat Bar Mirror Mount Kit with 4m cable for 3/8 springer CB Radio Antenna aerial . Standard CB antennas are antennas that require a ground plane (a metallic counterpoise) to perform properly. An antenna ground plane is not to be confused with an electrical ground. We are going to build a 1/4 wave elevated ground plane antenna for non-mobile use. This is the actual length of a quarter wave. A basic 1/2 wave base antenna with small ground planes (only about 1ft). A copy of the original Hygain silver rod. In reality I think the ground planes are too small to really make any difference, so you are probably just as well having the basic 1/2 wave! ... suitable for 3/8” fitting CB antennas, pre-wire... £19.96. Else known as Small Transmitting Loop or STL, this isn't a traditional "electric" antenna, because the "near field" is almost "magnetic". June 20, 2017 at 12:46 pm. It works awesome and turned out just as good as I hoped. 1- Strip back 1/8 inch insulation on wire and solder to center of SO239. Or does it have to be steel of some sorts? Now, in this article, we’ll show you how to ground your CB antenna properly. I wanted high efficiency 40 Meter antenna with low-angle radiation. The bell end will match the 3/4 inch opening to the box, allowing a tight seal. In this case for 10 and 11m. If you have an acceptable SWR reading you are now ready to start using your CB. Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. The body of the vehicle and the capacitive coupling to the surface under the vehicle, is acting as a ground plane, and a lossy one at that! Reader Interactions. There is equal but opposite RF currents flowing in the radials, which cancels radiation leaving only the vertical element as the radiator. Magnetic mobile antenna is supposed to be mounted on the roof of vehicle, thus metallic roof serves as ground plane. And the wavelength of this band is a little over 17 feet or 204 inches. £4.50. When using the MFJ 901B tuner, the "6 Band" CB to 10 meters Multiband Vertical Ground Plane tunes up nicely on ALL ham bands from 40 thru 10 meters giving a great match near or at 1:1 swr on all the hf bands from 40 thru 10 meters. In order to do this you need to take the antenna to the next 1/4 wave, which in this case is 3/4 wave. Ground Your Antenna Mount. Plastic washer set it down next flat metal washer then lock washer then put on the top antenna mount and spring make sure the bonding is strong. Know that the equipment for the ground plane and no ground plane frameworks are not interchangeable. N9ZMO Ham … Causing better receive and transmit. £3.99 + P&P. If you are just getting experience in building antennas or you are an old pro, here is a simple and fun project! Made of tubular aluminium, supplied with U-bolts for mounting on a standard size pole. 1. Remember that the FCC limits your antenna height to 60 feet. Make sure it ohms out and has no shorts. Ground Plane Antenna You Can Build The Ground Plane vertical omni directional antenna is very easy to build with just some #12 solid copper electrical wire and a UG58 type N chassis jack. This seems like a lot of work. Hang the wire vertically, or stretch it horizontally between 2 supports. It works as an insulator between antenna mount and antenna grounding post. A ground plane for a CB radio antenna is the metal surface needed below the antenna. In mobile applications, the vehicle body acts as the ground plane (reflective unit). If your antenna is mounted on a metal roof, the entire roof surface provides a ground plane, assuming that you don't have a sunroof. So for 50.200 MHz and SSB operation we would want an antenna that is 58.8″ long. Making the Ground Plane Antenna Tunable ; Palmdale, CA Wants to Effectively Ban Ham Radio ; Filed Under: antennas, VHF/FM/Repeaters Tagged With: ground plane, mag mount. CB Antenna . There are several devices available that can enhance your ground plane. If you’re using a standard CB antenna (i.e., anything except a no ground plane, or NGP, kit), you’ll need to make sure your antenna mount is solidly grounded to the vehicle’s chassis. I took it down because everyone kept telling me how inefficient the design was. Before you can make an antenna, you must understand how it works. Figure 2 shows a typical radiation pattern of a groundplane antenna as could be found in antenna handbooks. By John Portune W6NBC . Cbradio A Stealthy Homebrew Vertical Cb Dipole. Design Your Own Ground Plane. As it is magnetic antenna it probably does not have option to attach radials so you have to set it up on large enough sheet of metal. Say no to HOA Antenna restrictions! This normally occurs on vehicles constructed of plastic, fiberglass, and wood. I found that 6 meters may be useable also. The concept of a ground plane is roughly to build a antenna half as long as a normal self-contained one, then add a mirror so that it looks like a complete antenna from the antenna side of the mirror. Gain-Master™ is a 5/8 ... (Patent Pending) works like a central fed dipole so all RF currents on the radiator are in-phase and the ground plane radials are not necessary. A cell phone CB antenna is in a downward direction. What is the best way to do that? This link is listed in our web site directory since Monday Jul 21 2008, and till today "Ground Plane for 7 MHz" has been followed for a total of 3012 times.So far received 2 votes for a total score of 7.00/10 Does anyone have any ideas on how to establish a good ground plane? It's called an SO-239. Reply. Gain-Master Hi-Tech Fibreglass Base Station Antenna for CB & 10m Band. I want to get a better radio, but want to make sure the antenna system is okay first. The ground plane antenna is designed for unbalanced feed cables, like a coaxial cable. With my homemade ground plane made from three 4' Firestiks (one vertical and two radials slanted down at 45 degrees on a 15' mast) I was able to talk to a trucker 5 miles away and some guy in Oregon (I'm in Texas).

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