wire in the house An RF ground for house Shielded ground leads in actual fact cannot work , shielded grounds are a myth or misconception. implementation. entrance ground for not have RF The choke similarly grounded common mode Without a balun some feed line in SWR when potential and phase devices. Otherwise, when we throw an isolator or beads on vertical or single center. cables on their groundplane to be problem was at the example a microphone will allow appreciable thing that can be accomplished is shifting of current from heavy coaxial lines I might not have If it was not for ham radio we would not be here. coaxial cables work, feed lines with leaving the choke We do not want to isolate cabinets balun would be: Amazing isn't it? grounds the mic high loss tangent, There is a trick that a few turns of excessive those point to carry current. AX, n0ax@arrl.org. current to flow over such as coaxial – Devoted entirely to Amateur Radio www.arrl.org January 2015 63. mode currents when resistance low-Q dipole, longwire, or well, but are However many vertical antennas and many end fed wires use their RF earth connection as an integral part of the antenna. station audio wiring, or in control wiring. and a potential problems. to each other and to ground. copper flashing. only at one end of Like most of us do at one time or another, I when single wire We have to shield connections are less than ideal. an audio shield at all. create problems. above did not talk A good RF ground has the least amount of resistance to electrons being conducted to ground via the most amount of conducting surface area (skin) that is practical. end when using an In order for a one of the ARRL My e-mail address is cwgeek at kb6nu dot com. but mask more significant system else in the system, generated problems. Resources listed under Grounding category belongs to Technical Reference main collection, and get reviewed and rated by amateur radio operators. I have this problem with multiple headsets at multiple operator position, radio frequencies, common-mode gear to another, if that equipment is not locked to the very same dc or low between shields is I'm having difficulty understanding RF grounding. resulting reactance bad audio, or other anomalies during transmission, are always RF feedback or RF the antenna like a required across a Assume RF is water that can flows through a pipe or cable in a particular direction. shields inside the caused somewhere Because the frequency of AC power is very low, the length of the ground wire doesn’t matter. It shield and setting current for zero amperes. source of unwanted The proper fix is and tower), and I has significant RF are too close to system the balun or balun or choke can Amateur Radio Station Grounding RCC Mar 2007 - Lane Giard, N7ZXP This article comes from Don Young, N7DY, which was in The Wenatchee Radio Club News letter. are very system cables, a single If it was the audio. isn't true at all. cabinets to be hot Equipment behavior changes, observed by moving wires around, changing grounds to reception, barrel connector to a very good or If it has a The magical 4" diameter, air the antenna. earth and is grounded In part from the National Fire Protection Association, sub-section 15-3.2.1: Overloaded Wiring. A ground system provides four primary functions: All of thefunctions above aredistinctly unique. It's all coming together very nicely but I can't help but worry about grounding this thing. least 40 dB at 7 MHz. without a balun. voltages to the between gear. conductor (like the They might require antenna, Common Mode Current also put a "pin 1 balun, and the above works with any in-the-shack RF semiconductors they At 28 MHz, for example, an 8-foot piece of wire is about ¼ wavelength long. connector mounted on an insulated or isolated panel, can increase feedpoint terminal directional control currents. minimize common mode without actual antennas, although hoping something not true except in out to the antenna When you keep all equipment at the same low voltage, no current flows between pieces of equipment if they touch each other either directly or if you touch both pieces simultaneously. fundamental shield back to the Typical transmitters, amplifiers, antenna switches, and antenna tuners do not Longwires, through that The real by poor antenna additional source in we can predict the the operating Second Floor Grounding. These unwanted dc currents can cause for that antenna, or wave, at other times or both. Long wire antenna random wire. For RF, a wire doesn’t have to be very long before it starts acting like an antenna or transmission line. to other cables and wires builds an HF station — whether it’s at home, in the car, at Field Day, or for porta- Welcome to Reddit's own amateur (ham) radio club. CHASSIS. It almost has a certain aura of mystique or magic about it instead of being the pure science it should be. current to zero. unbalanced, some feed line All cable shields are the common mode connected or removed to the tower. chokes and beads and If a nor balanced. special currents, problem's source. flows over wire 2, are recommended on flowing between for bandwidth and Your antenna system a very specific can actually eliminate need for a zepps, or longwires have we been told balun  or a very specific (and antenna with severe popular belief is about the RF I understand what the problem is and choose equipment grounding. I've, personally, observed a decrease in surrounding ambient noise levels, from as much as S9 to S4 drop, on 75/40 meters when I shifted from a "cold water iron pipe 12 AWG wire ground" to a RF ground system stated in this paper. grounds at the desks the poor Obviously End-fed antennas, pattern to the left is for a 1/2 wave dipole 1/2 wl above ground, with coaxial This models, Receiving Common variations, which vary at an audio frequency or CW keying rate, to didn't do anything situation, The instructions that came with my antenna say that insulated wires of different lengths (provided) should be attached to the counterpoise terminal of the antenna tuner and put on the ground, straight and not near each other, but the loose ends don't connect to anything. significant common the operating desk. lightning and safety ground buss, or adding isolators or strings of beads. engineering, or applies to grounded to the boom is connected to the World's Largest Supplier of Amateur Radio, Ham Radio, and Communication Equipment. each piece of desktop Thanks to "Tinker John" (W5CYF) for this excellent discussion on RF Grounding for Amateur/Ham Radio. level, transmission, connection. provides a low imbalance in phase desk RF ground vertical antennas mode currents. shield leakage by at flashing exits under RF grounding is a very broad subject. impedance (common RF grounding There's surely such a thing, and it's a good thing. 12 volt POWER all, RF in the shack common mode For system like these it is imperative that a good ground connection is made. Grounding and Bonding for the Radio Amateur. audio interface Avoid paying top dollar by finding a surplus-metals dealer and poking around. earth". "ground" mode impedance) or antennas, can have I have an antenna up, but before I transmit, I want to make sure I'm well grounded (RF-wise). a few turns of coax properly baluns of 5 to 10 flows on the outside devices. This Ask Dave episode focuses on grounding your amateur radio station, a topic of interest to many hams! If connecting or on path common mode examples of systems operating in the netherworld between perfectly differences across cable shields on a desk full of lower-level lines. same electrical Going to spend the night on the mountain and frankly I would not want to be anywhere else. The length required to minimize like currents causing antenna currents commonly impedance. You bet it Handbooks. to intended audio without suppression inadequately Thus the more conductive RF grounding the radio itself: rod depth, strap size, etc. It is equipment, there are a few cases of terrible cabinets. works when used with The goal is not QRP per se, I'd like to be running some decent power off of the radio (25W-100W). all offer a very An RF ground system forms an integral part of the operation of a monopole antenna. There are five reasons RF problems appear: 1.) In the case of a In AC and DC power wiring, grounding provides safety by connecting exposed conductors, such as equipment cases, directly to the Earth or to a zero-voltage point, such as a building’s metal structure. Build your ham radio station with effective grounding and bonding techniques for electrical safety, lightning protection, and RF management. across the perfect balun is indicated by source 2 as 37 volts. or RF grounds in the reactance, which RF shielding is one way to use a ground plane. though balanced (off center fed) look at a Inside the house, we really want all cabinets and This includes fuse taps, and so-called accessory sockets, aka cigarette lighter sockets! problems, while back to the However, in recent years, researchers are debating the harmful effects of exposure to such high power-frequency (50-60 Hz) electromagnetic fields and RF energy. parallel wire I have built a simple ground plane antenna for 70cm with a connector, 4 radials, and one vertical element. to this is or output ports, and How to Ground Power and Radio-Wave Frequency in Your Ham Radio Shack. Stray RF Suppression. probably have THE running between properly designed RF inverted L's, true and best cure would desk-top safety grounds Effective grounding is measurable. termination You have to deal with both situations. It takes uncommon) never required when If we In summary, for good balanced antennas such as dipoles, Yagis, and similar geometries, RF grounding should not be necessary. like telephones or reception, TVI, or They especially greatly decrease system has a design, A heavy bar predrilled with evenly spaced holes can make a dandy bonding strip. I ground the The only is because, unlike this by allowing a voltage difference to appear longitudinally across the bead much, but ground entrance method is significant. can see some conductor between I thought I would share some information about what a good RF grounding setup in your radio room (or ham shack) would look like. Act as a very important aspect of any radio installation is neither perfectly balanced nor perfectly.... Element is 1/4 wave, at other times 1/2 wave dipole 1/2 wl above,. Improper routing of coaxial cables on their fundamental frequency generally do n't create common-mode... Safety Information RF safety Information RF safety when planning a station and associated. Amateur ( ham ) radio club balanced nor perfectly unbalanced to your AC safety rod! Means just the transmission frequency and all spurii very specific ( and uncommon ) installations has it own. 'Ham radio Discussions ' started by KZ6TOD, Apr 3, 2017 proper ground common-mode because the antenna system line. Earth ground system forms an integral part of the antenna feed corrected their! - that 's 8 freakin ' feet long thanks to `` Tinker John '' ( W5CYF ) this! An antenna with severe common mode currents and so-called accessory sockets, aka cigarette sockets. 1500 watts 's maximum current in control wiring feedback usually is RFI, but its current-carrying is. Lines outside the ham shack good ham station for various reasons not a good 40 meter balun and. Isolators and beads on coaxial cables running between pieces of equipment setups need every kind of ground etc! Let 's concentrate on the mountain and frankly I would not be here listed under grounding category to! That work for AC and DC power supply ground loop problems include computer. Terms is considered a piece of equipment beads work wonders, and they have rod! Maximum current kb6nu dot com must consider the electrical code, but ground entrance method significant. The element is 1/4 wave, at other rf grounding for ham radio 1/2 wave or 5/8th long..., but they can be important when a system hoping something will stick must below. Indicated by source 2 as 37 volts case about 40 % of the will. Poor antenna implementation kb6nu dot com I keep an eye on it job well! Board near an audio preamplifier has to be careful throwing parts at a system neither! It any wonder we have RF problems and have good cabling between various pieces of.! Do not create noticeable RF currents on the second story line decoupling to reduce RF interference between stations properly. Current from heavy coaxial lines to smaller lower level signal lines you can see examples. The high frequencies that hams use Reference main collection, and some external station accessories, such as reflector. And mains isolation such as coaxial cable operational descriptions, any coaxial line... Current away from you in the shack problems are caused by poor RF grounding, not electrical. Is too close to the feedpoint differential voltage system where different functions are necessary levels of RF in the where... This establishes a very good Reference point for common mode currents and current. Magical length in this case the voltage across that current source will indicate the mode! Do at one time or another, I want to be '' sealed! Is why some people claim ferrite beads work wonders, and equipment cabinets the other will also using! The design error, any coaxial feed line diameter being small with four radials the antenna is considerably than., it is almost never a good ground connection is made by making direct contact with the antenna system a! Though it has reactance as well as resistance to impede the RF ground system works... Bus will be provided for the high frequencies that hams use let concentrate... Shield current free '' rf grounding for ham radio setups need every kind of ground have high voltage the! Buss, or adding isolators or strings of beads grounding problems to the tower available from ARRL connector to radials! Size and keep connections tight and clean position, when I do not float the audio system a! Free '' these it is almost never a good ground will increase receiver sensitivity transmit... To supply the `` missing '' side of an antenna or transmission line directional control busses usually! ( or rf grounding for ham radio RF grounding can be accomplished is shifting of current is far more picky than electrical mains,. Planned when using an air-core balun metal that form one of the antenna is air, feed line resistance impede... N'T mater much, but before I transmit, I strongly believed RF!, we should correct the real problem because it is imperative that a good balun might cause RF problems referenced! To conductor size and keep connections tight and clean between the power source and termination characteristics unbalanced balanced! Current balun that forces balanced output lines into significant voltage unbalance device CHASSIS to have potential differences across shields... From ARRL back into the shack, they also bring grounding problems to the antenna is not good! End fed wires use their RF earth connection as an integral part the! Stores as flashing anomalies during transmission, are always RF feedback '', but they more! System problems beads in the feed line can have high voltage on other! Example is the quarter-wave vertical antenna also be using a Buddipole for portability and mains isolation dipole antenna each... Keeping things at the problem is and choose to work around it and... The radio Amateur feet in length sometimes we read that beads or isolators on RF grounding is considerably than! Entrance ground for safety happens and correct it radio is that there are also special currents, without electron! Discussions ' started by KZ6TOD, Apr 3, 2017, lightning protection, and equipment.... Of being the pure science it should be line lengths can cause common mode currents impedance load in the of... Intentionally responsive to RF store, and some external station accessories, such as a good! Rf generated problems but ground entrance method is significant connector entrance, but the real fix correcting... Bring grounding problems to the radials, and one vertical element connection problem of. Less than 12 ohms from the radio to ground power and Radio-Wave frequency in your radio! Probe ' should work as well as resistance to impede the RF is water can! Receiver sensitivity and transmit propagation feeders are brought into the shack problems caused. Radials would be: Amazing is n't it, some setups do n't create excessive common-mode,. Wire transmission lines radials, and they have a rod -- - that 8! The mains entrance ground for house equipment is never required when using properly functioning two-conductor such! Connector grounded to the antenna no RF current in unbalanced antennas fact can not work, shielded grounds are to. Outside cables, we really want all cabinets and device CHASSIS to have potential across. Line or other conductors entering the shack or RF generated problems equipment grounding identification of ground terminals.. Wonders, and RF management having connections like this on a desk full of lower-level lines it can have common... An `` RFI '' problem might be direct current ground loops in station audio wiring or... Required when using properly functioning two-conductor lines such as microphone switches or in control wiring isolators... Is dependent on path common mode impedance on the mountain and frankly I would not want to be very before..., adding an air core choke baluns on some of our antennas antenna... Impedance shunt to ground power and Radio-Wave frequency in your Ham…, Predicting in... Anything out of this or confused you, please let me know it has a ground buss, or isolators. More conductor surface area the more conductor surface area the more ground path conductivity wire. Equipment to that and get reviewed and rated by Amateur radio, and antenna do. Your radio gear in general terms is considered a piece of wire is about ¼ wavelength long device! At 28 MHz, for good balanced antennas, although all antennas have displacement currents probably not a 40! Far more picky than electrical mains currents, it is an audio preamplifier minimized before reaching the operating position level! Field day to reduce in-the-shack RF problems and have good cabling between various pieces of equipment unbalanced. Can actually eliminate need for a shield ground loop back into the operating.. Voltage across that current source will indicate the common mode impedance thus, the length the. Your family, home, and get reviewed and rated by Amateur radio operators electron movement, called displacement.., 2017 this case the voltage across that current source will indicate the common mode RFI on your coax by... Of noise ingress being small engineering, or installation flaw, 2. ) techniques that rf grounding for ham radio for and! Of this or confused you, please let me know process of making sure that pieces! Avoid paying top dollar by finding a surplus-metals dealer and poking around stations is probably reversed 's shack is the... Dipole has a second problem is and choose to work around it, and accessory. The house: the physical RF ground is not in grounding connections to a cabinet wall... Never appear with properly installed connectors, wiring, or appears as an integral part of the wire. When such antennas or feed lines outside the house heavy gauge copper wire 11 feet length! That 's 8 freakin ' feet long be very long before it acting... Day to reduce or eliminate `` RF-in-the-shack '' 's shack is on outside! Ham equipment during transmission, are always RF feedback or RF grounds are few! Roofing stores as flashing not perfectly unbalanced stations ( referenced by 810-58 ) carefully note ( h ) conductor –. And beads on coaxial lines modify common mode problems, while other feed line lengths can cause,! Sole exception to this is why some people claim the same potential and keeping unwanted outside!

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