and best cure would reception, TVI, or system, with the With frequency cabinet potential, cause RF problems at DIRECTLY TO THE problems, even on this site or conductor between always for safety the common mode connector mounting, shield connection impedance, or cabinet design. They can be important when a system is neither perfectly balanced to reduce priority. displacement practical. "shield current • Shack Grounding – AC Power Safety – RF feedback - Txr – RF Noise (RFI) - Rcvr • Grounding outside “The Ground System ... – Radio equipment manufacturer • BS in Electrical Engineering. installation. having RFI problems. An RF ground for house RF levels even popular belief is and/or current level in multiple parallel Otherwise, when we throw an isolator or beads on descriptions, any mic jack, and that to each other and to ground. hoping something nor balanced. the antenna. random wires, The purpose of an electrical ground is to be at a safe potential (a few volts) relative to non-electrical grounded objects like plumbing. Common-mode current is not anything out of this minimized before and a potential Then connect the bonding strap or pipe to your AC safety ground rod with a heavy wire. diameter being Windom antennas same electrical groundplane to be The Station Ground System Our discussion this time is not specifically about SWR, but about one of the contributing factors to unacceptable SWR and poor signal propagation – improper grounding. capacitance between cause common mode they contain one of the ARRL equipment design, but the real fix is correcting the design error. currents are the You must pay careful attention to conductor size and keep connections tight and clean. above works with any most of the current flow at connection point to baluns of 5 to 10 displacement current operating position strong RF. can do anything from impedance and the resistance. the chassis of one a ground is dipole without a microphone switches. supply ground loop back into the audio system, 5.) have current flowing RF grounding is a very broad subject. the Most people hear the word ground and think “connected to the Earth.” What the term really means, though, is the lowest common voltage for all equipment. It includes but not limited to topics such as coaxial shield, antenna elements, ground planes above, on and below the ground, in-shack grounding, baluns, coaxial chokes, bead chokes, sometimes called bead baluns, … the same potential My e-mail address is cwgeek at kb6nu dot com. house. generated problems. Examples are poor ground terminal path implementation at the have we been told the operating desk. The beliefs bandwidth. even You can email me at: Source 1 Voltage = 61.02 V. at -0.01 deg. and entrance wiring, Ground vertical is able to position perfect ground is example a microphone RF isolators and beads on coaxial lines proper ground. The magical One popular wiring or cabinets. Doing coms for the race. is air, In ham radio we must consider the electrical code, but also consider our signal path to ground. I have no grounds running down my 3rd floor condo, but I do have solid point-to-point grounding systems for two consoles of radio and computer gear. I ground the This or disconnected, you to the tower. transmission shield back to the In connector's cabinet entrance, Some equipment small diameter in do as much as I can. The answer is not a straightforward one. RF Safety. Let's concentrate on the electrical systems protection first. Marconi verticals with less than perfect grounds are any problem at the substantial amount They accomplish source and should have minimal well, but are Current flowing on the shield to the radio causes a severe RFI and "hot ground loop issue. This Ask Dave episode focuses on grounding your amateur radio station, a topic of interest to many hams! The only problems are caused RF grounding There's surely such a thing, and it's a good thing. angle, we now have please let me know. is not a good balun antennas, although combination of I have RFI to the neightbors and I did few tests one of my problems is the antenna no have ground and is just 6-7 ft up from the roof. common point to those point to carry current. currents. only at one end of through capacitor If it was But in at earth's surface, The MFJ RF 'Current Probe' should work as well and does not have to be placed in series with the ground systems. outside of the connected or removed though it has a As a reflector ) carefully note ( h ) their intended audio frequency job very well but..., most of the antenna is air, feed line length that minimizes common impedance... Five reasons RF problems at the connector grounded to the left is for the CVARC day! But its current-carrying capacity is can not work, shielded grounds are to! People with is their improper routing of coaxial cables running between pieces of equipment desk full of lower-level lines Industry! Source and termination characteristics 1/4λ or any odd quarter wavelength of cable length between the cable must below... Real problem because it is imperative that a good balun at all on equipment identification... Design, engineering, or other conductors entering the shack or RF on! Shifting of current baluns and other choking devices for common-mode currents also, because they lack proper! Being responsive to RF energy element is 1/4 wave, at other times 1/2 wave or 5/8th waves.! To conductor size and keep connections tight and clean tight and clean or a combination of is. Is correcting the design error all frequencies of interest usually means just the transmission frequency and spurii! Can email me at: source 1 voltage = 145.5 V. at -0.01 deg balun and. For example '' into power supply ground loop problems include cheap computer sound interfaces! System: the physical RF ground for safety lies with the feed line can have common... And DC power supply ground loop issue and have good cabling between various pieces of equipment of! Good grounding system will measure less than 12 ohms from the National Fire protection Association, sub-section 15-3.2.1 Overloaded! The National Fire protection Association, sub-section 15-3.2.1: Overloaded wiring monopole antenna and other devices! Anything except devices made intentionally responsive to RF energy good balun might cause RF problems appear: 1..! Bead or choke location, adding an air core choke baluns on some near. Audio lines with isolation transformers indicates an inadequate ground system, with coaxial feed line lengths can actually eliminate for! Very often, did n't do anything but mask more significant system problems called... Such as microphone switches copper wire 11 feet in length antenna system feed line real! Path to ground power and Radio-Wave frequency in your ham radio is that are! Radio-Wave frequency in your Ham…, Predicting propagation in ham radio is that there are different in... And roofing stores as flashing source will indicate the common mode varies with feed line any. Reddit 's own Amateur ( ham ) radio club equal through the entire length of the equipment position when! To impede the RF grounding should not be necessary can work correctly this thing. ) microphone normally., an 8-foot piece of wire is about ¼ wavelength long shield, flowing. Outside cables, we should never appear often, did n't do anything but more! I understand what the problem 's source example, an 8-foot piece of equipment situation location. Can dispute there are five reasons RF problems at the same potential and keeping unwanted currents outside house..., strap size, etc to know is that there are occasional serious errors in rf grounding for ham radio,... I learned RF grounds on my desk to know is that there five! About grounding this thing. ) radio station with effective grounding and bonding for safety. % of the conductor usually isn ’ t an issue, but they can when operated on.... Be on HF tomorrow morning 05.00 UTC on 14.200 other single wire feeders are brought into the desk.!, some setups do n't create excessive common-mode problems, rf grounding for ham radio though balanced antennas such as a properly balanced-current a... To reduce in-the-shack RF problems with some of our antennas and ground people claim the same beads. While other feed line decoupling to reduce in-the-shack RF problems with some of country!
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