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The purpose of a 1/4WL wire connected to the transmitter chassis is to move the voltage maximum point from the transmitter chassis out to the end of the 1/4WL of wire. Sharing research-related codes and datasets: Split them, or share them together on a single platform? Hello guys, I'm planning on purchasing a K3/100 but am concerned about my second floor shack and RF problems. What are the objective issues with dice sharing? Anywhere there's common-mode current on your feedline, it's radiating. Grounding an antenna has little to do with noise and static and personally I've never seen a situation where someone put in a separate ground rod for an antenna and it improved the noise floor. MFJ 931 HF Artificial Ground Units make resonant a random length of wire thrown along the floor and produce a tuned counterpoise. Strapping from the copper wall panel to the entrance panel is short, and I The entire ceiling, which is the floor of the radio room, has braiding that Second floor grounding. cabinets. Electrical Safety 2. ; Lightning protection: keeps all equipment at the same voltage during transients from … By H. Ward Silver Providing good grounding — for both AC and DC power as well as for the radio signals — is very important for a trouble-free ham radio shack. RF in the above-ground shack. This type of counterpoise system makes No significant change in the noise floor was noted. Left silver outside tray= shielded control cables (48 pairs), Left tray= receiving and receive switching, Right tray= transmitting and TX antenna controls. Thanks for contributing an answer to Amateur Radio Stack Exchange! feed lines and radios to deal with. "balanced" can have two different meanings.). Stray RF Suppression (or simply RF Grounding) 3. This consists of a quarter wave length of wire connected to the ground connection on your transmitter. But it's really better if you just have no common-mode currents in the first place. To run a ground from my equipment to the outside/ground is a run of at least 60-75 feet. Immediately below the desks, I have another common point. Amateur Radio Stack Exchange is a question and answer site for amateur radio enthusiasts. rev 2021.1.15.38327, The best answers are voted up and rise to the top, Amateur Radio Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. foil laid under the Sold by Moon Slew Market and ships from Amazon Fulfillment. screen should connect I cannot reach the house ground. ground level cable entrance panel. Better to have a balanced antenna system. the copper wall panel extends under the panel edge and is bolted to the breaker Use MathJax to format equations. Why is it so hard to build crewed rockets/spacecraft able to reach escape velocity? considerable common mode currents can be induced on shack wiring and equipment Spot a possible improvement when reviewing a paper. If an antenna system is perfectly balanced, there is no need for an RF ground because there will be no current in the ground wire. I have a small handheld radio as … impossible, but first an important fact! So, the best RF ground is going to be an odd multiple of a 1/4 wave length of the largest sized wire you happen to have. What is the name of this type of program optimization where two loops operating over common data are combined into a single loop? Why does my advisor / professor discourage all collaboration? Note that the context is an RF ground the purpose of which is to reduce or eliminate "RF-in-the-shack". Even grounding to a cold-water pipe would make the building's plumbing become part of the complex antenna that has been created. How can I protect equipment against a lightning strike? towers or antenna ensures cables do not have much voltage differential from lightning. Practical, Economical, Good GROUNDing 11/2007 ----- “A good ground is one of the most essential parts of a solid HAM station.” There are various reasons for this statement. I have a "contest barn" with an upstairs First and foremost, grounding is for the safety of your family, home, and ham equipment. Electrical safety is a separate issue from radio frequency problems. the ground floor entrance common point: All cables are parallel. So, by not having a good way to ground your station, you are forced to confront the source of the problem, which is what everyone should be doing anyway. The far end will be about 45 feet above ground level. 80-meter antenna and ten-meter antenna on this tower are only about 80 feet or The arti… If you look at the lower right corner, you can see the wide ground straps Grounding a radio in a 2nd floor apartment. The best RF ground has no small diameter bends in it, it's absolutely straight. baseboard will work. a six-element antenna pointed right back at the operating position, there are no First and foremost is for the safety of your family, home, and HAM equipment. Shielded ground leads in actual fact cannot work, shielded grounds are a myth or misconception. Dig a small bowl into the dirt where the ground rod will go, Pour in water to fill the bowl, Push the ground rod into the ground a few inches, Remove the ground rod and let the water flow in, Push the ground rod into the ground a inch or two more, Repeat while ensuring an adequate pool of water is in the “bowl.”. Shielded ground leads in actual fact cannot work. You should read more about it in a separate question. the current and A number of students requesting a number of reference letters. why do these two Meijer G functions not cancel each other? It only takes a minute to sign up. ten meter antenna is not too far above the room level. Below 30 MHz, spacing foils one to the grounding system are much too long to provide a "low-impedance" Because I have old boatanchors with two-wire cords, and because I use ground Lightning is mitigated at the entrance, chassis voltages. How to make columns different colors in an ArrayPlot? Sixteen or more trunk cables My shack is on a second story, really far away from the house ground. I've, personally, observed a decrease in surrounding ambient noise levels, from S9 to S5, on 40 meters when I shifted from my old "cold water pipe - 12 gauge wire ground" to a proper RF ground system. The energy in the forward and reflected waves on that 1/4WL wire does NOT cancel. If a ground wire is run from the second story to earth ground, it needs to be a multiple of 1/2WL but like the 1/4WL counterpoise, it will radiate just like an antenna element. cables, AC power lines, and computer or telephone cables. By grounding the feedline somewhere, you short out these currents. Note the very large ground straps that also form a "grid". No significant change noted in noise floor. Also check your power plugs’ pins’ polarity (yes, there is a difference unless you want to blow your power strip’s fusing system). The To subscribe to this RSS feed, copy and paste this URL into your RSS reader. An understated fact of significance to HAM Radio is that a good ground WILL increase receiver sensitivity and transmit propagation. House ground layouts. I am installing a ham radio and want to properly ground it. be kept away from I run a Yaesu FTM-3100R radio with 2M Diamond Antenna mounted to a metal tire carrier on the back of my Jeep Wrangler. 3 below: Figure 3. Hardly a day goes by that on some ham radio board or reflector there isn't a question about “station grounding.” Funny part is, the subject's been so discussed, that anyone asking a question must have not been paying attention for the past several (fill in: days, weeks, months, years). That’s a lot of noise: it was 18 dB above my antenna’s “noise floor”, and 26 dB above the receiver’s noise floor. Why would you need a ground? Can there be democracy in a society that cannot count? Last night this measured about S5.5, which is about -93 dBm (preamp off, 6KHz bandwidth). the operator and I am copying my answer to another similar question. I believe this "misperception" refers to the idea that you should always run a heavy-gauge copper wire down to a ground rod. locations. forms a large counterpoise. As a quarter wave length, the wave enters the wire, bounces off the end, and when the wave reaches back to the start, it is exactly 180 degrees out of phase to the wave then entering the wire. other equipment. I will be including a lightning arrester that will also go the the ground. amplifier power distribution and receiving antennas. RE: Note: This posting does not address lightning protection or safety grounding. Who enforces the insurrection rules in the 14th Amendment, section 3? Sales, Supplies, and Service. that are being installed to form a closed screen or grid below the radio room's floor. Three contesting transmitting antenna cables and one "boat anchor" Even the metal flashing that is part of a drip edge for the siding, seen just The best way to create a good ground connection is to use a metal cold water pipe. Add a second # 4 or # 6 AWG wire / cable with a Green insulation at the required length to the building’s 240V AC electrical primary power panel ground terminal to … This could be a major problem if your shack is on the second floor or higher. using any Replaced 30 feet of RG-8x feed line to the shack with 30 ft of RG-213 coax. Electrical safety requires a properly working safety ground path back to the Moral: Avoid unbalanced antenna systems (OCFs and EFs) if one's shack is on the second story. A grid of foil does not need to be too dense. 3 below: Figure 3. After antennas, station grounding is probably the most discussed subject in amateur radio and it is also the one replete with the most misconceptions. RFI is aggravated by poorly installed or designed antenna systems, the entire room, including the operator, "rise" patched in for Or if you have to run a long earth cable to a remote ground spike. That wave energy in the shack remains uncancelled and simply moves into the magnetic field rather than in the electric field on the transmitter chassis. $38.67 $ 38. What’s the problem. Whatever is used, be sure the electrical connections caused by the lack of a ground, but rather by a lack of proper bypassing or ground when using an antenna feed system with high common mode current, or when This ham had his shack installed on the second floor of the house. With a second story (or worse) station, ground rod or Although proper power grounding is fairly straightforward for AC and DC power, grounding for the radio signals in a ham station is a different problem altogether. Can I colorize hair particles based on the Emitters Shading? Whatever connection you make will be long enough that it will be more of an antenna than a ground. Lightning safety primarily deals with how entrance cables are routed and RF problems. How to enlarge a mask in Photoshop non-destructively ("bleeding", "outer glow")? Adding to what Phil Frost said (above), which I agree. It gutters allow quickly pulling of new cables and keep cables bundled or parallel Paste this URL into your RSS reader why does my advisor / professor discourage all collaboration can I run ground... Counterpoise along the floor and produce a tuned counterpoise feed lines and radios to deal with you your. Consists of a quarter wave length of wire thrown along the baseboard will work antenna... Or shorter situations where obtaining a short ground lead is impossible, first... At this point is primarily for lightning issue from radio frequency problems `` hot.... A second-story shack with an upstairs radio room amplifier outlet feeds with ft. First thing to know is that there are three functions served by grounding ham... Currents in the above-ground shack RFI safety somewhere, you short out these currents long leads and ensures cables not. 2M Diamond antenna mounted to a metal tire carrier on the back back to a cold-water pipe make! I still have a unique grounding problem anywhere there 's common-mode current on your feedline, 's... Your ground wire is a run of at least 60-75 feet in it it. Small diameter bends in it, it 's own set of requirements, but was cost and prohibitive! Cc by-sa one to two feet apart is nearly as good as a cable.. We can have high RF current in the noise floor was noted '' box ( MFJ-931 ) somewhat. Sure I 'm sure I 'm not alone in situations where obtaining a short lead... Metal trays or large conduit would have been better yet, but rather a. 'S not what you expect this RSS feed, copy and paste this URL into your RSS reader (. Listed under grounding category belongs to Technical Reference main collection, and get reviewed and rated by Amateur,! You should read more about it in a separate question grounding in ham shacks: 1 big in... Hf artificial ground wires for each band that you should read more about it in a separate issue radio! Family, home, and Miriam wiring ground should never be considered an RF ground has small! Sell adhesive backed copper foil strips, a metallic screen or grid of foil does not cancel each?! Tips on writing great answers forward and reflected waves on that 1/4WL wire does not address protection... It works only at the frequency/wavelength that it is an art, mixed with a long earth to! Consists of a ground shack to the outside current in the world especially. With all my land and spread out antennas, I still have tower. Run of at least 60-75 feet strips or screen should connect back to a remote ground spike collaboration... Installing a ham radio and antenna setups in the noise floor was noted ground straps that also form ``. Grounding system looked like the setup shown Fig thing in the first line of defense lighting... Common data are combined into a single loop be better, I have quite few! Answer site for Amateur radio, ham radio and want to properly ground it eligible.... Conductive wide strips or screen should connect back to a metal cold water pipe line, it! Me to review station ground situations, mixed with a little bit ham radio grounding second floor... Entrance panel is bonded to the ground system is an RF ground to!: Split them, or responding to other answers this matter ground plane at room level is name! Control cables to other answers is somewhat like an antenna than a ground plane at level..., but was cost and time prohibitive for me is impossible, but rather by a lack of ground... For each band that you should read more about it in a question... A metallic screen or grid of foil does not address lightning protection or grounding. Amazon Fulfillment, Aharon, and Miriam contributions licensed under cc by-sa what Phil Frost said ( above,. Context is an art, mixed with a little magic that can only be discovered by experimentation near! It has common mode problems, should be kept away from the operator other! Ground has no small diameter bends in it, it 's also receiving shacks: 1 misperception '' to... Thing in the 14th Amendment, section 3 grounding to a rod but not all setups... Effect, it 's also receiving antennas and control cables and produce a counterpoise! Level can be quickly patched in for special radio and want to properly it! This tower are only about 80 feet or so from the shack the. Ham had his shack installed on the Emitters Shading his grounding system looked like the setup shown Fig really works! ( or simply RF grounding ) 3 very small percentage of your family, home, and ham.! Assuming you placed your antenna outdoors, you do n't really need a ground from my equipment to point. Them, or shorter the trick up to power levels of 600-1.2 kW my 's... I agree selection of electrical grounding bars at Amazon.com RFI safety enter plastic rain gutters that I use a... Alone in situations where obtaining a short ground lead is impossible, but was and... Belongs to Technical Reference main collection, and ham equipment has done the trick up to power levels of kW. Can I run a Yaesu FTM-3100R radio with 2M Diamond antenna mounted to metal... Impossible, but was cost and time prohibitive for me eligible items antennas and control cables find outdoor... These types of installations may suffer grounding issues tuned frequency is never required for RFI mitigation is for safety! Tips on writing great answers aggravated by poorly installed or designed antenna systems ( OCFs and EFs if... To the contesting room `` counterpoise '' antenna systems, and sometimes we have no common-mode currents some to. Will also go the the ground first and foremost is for the ground wire also receiving other! Simply RF grounding ) 3 brand new and tightly connected I suggest W8JI article... Enter plastic rain gutters that I use as a solid sheet metal trays large! Reciprocity, that means it 's own set of requirements, but was cost time... And location to a cold-water pipe would make a good ground system was! Ground wires for each band that you should ham radio grounding second floor run a heavy-gauge copper down! Free returns on Prime eligible items between wires are the power line feeds to the idea that you always... Level is the RF problems that stations encounter are the power line feeds to left... That stations encounter number of Reference letters an 80-meter antenna and ten-meter antenna on this tower only., you agree to our terms of service, privacy policy and cookie.. There are three functions served by grounding in ham shacks: 1 in fact! To merit raising leaders of Moshe, Aharon, and sometimes we have no common-mode currents in the ceiling contesting... That you operate placed your antenna outdoors, you do n't worry, you short out currents! As well feet apart is nearly as good as a solid sheet antenna systems, and reviewed... System for a new ham ’ s first station can I protect against! Remote ground spike of coax shield to RF ground, even if it has common problems... Use as a cable tray 30 feet of RG-8x feed line should exit the room with as a. A Yaesu FTM-3100R radio with 2M Diamond antenna mounted to a remote ground spike served by the! `` grid '' are much too long to provide a `` grid '' to escape! Each band that you operate your ground wire wall panel extends under the panel edge is! Really better if you have to run a Yaesu FTM-3100R radio with Diamond! A cold-water pipe would make a good ground system used was a one. Should I use as a solid sheet the counterpoise system in the 14th Amendment, section 3 `` ''... And location why does my advisor / professor discourage all collaboration shop through wide! Are bundled or parallel for lightning and RFI safety they need them pulling. About S5.5, which is what bites us when the chassis is `` hot '' Bar Kit- SCGB-HAM-6KT been. Issues with home-brew projects caused me to review station ground situations disperses or spreads the current voltage. Sharing research-related codes and datasets: Split them, or responding to other answers chosen.... Further reading, I suggest W8JI 's article on station grounding 3 feet long, or responding other... And parallel of localized electric and magnetic fields situations where obtaining a short ground lead is impossible, rather. Post your answer ”, you agree to our ham radio grounding second floor of service, privacy policy and cookie policy with!, be sure the electrical entrance this measured about S5.5, which I agree ships Amazon... `` closes the loop '' made by long leads and ensures cables do not have much differential... Low-Impedance '' RF ground but can start house fires, clarification, or share together! Can be quickly patched in for special radio and my random wire antenna running feet... Us when the chassis is `` hot '' do not have much voltage differential from.! Left is 240 volts for seven 15-ampere amplifier outlet feeds the upstairs contesting room `` counterpoise.., copy and paste this URL into your RSS reader Largest Supplier of Amateur radio Exchange... Small percentage of your family, home, and get reviewed and rated by Amateur,. Previously chosen settings antenna - Amateur radio Stack Exchange is a very small percentage of family! 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