Questions tagged [grounding]

Use this tag for questions relating to RF and DC grounding in radio equipment. Specifically suggested methods, practices, equipment and regulations regarding grounding.

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4
votes
1answer
42 views

Easy Digi hum with isolated ground

I am creating an Echolink simplex link using a Raspberry Pi 3 B+, a Pluggable USB sound adapter, and an "Easy Digi" sound card interface which has 2 - 600ohm isolation transformers for audio in/out as ...
3
votes
1answer
106 views

Grounding for lightning safety - upper floor (UHF/microwave antennas)

I have some UHF, microwave antennas and an antenna rotator on a roof mounted mast. The "radio room" is in the second floor just below the antennas. Also the service entrance for building electricity ...
3
votes
1answer
74 views

Should I use the same grounding rod to ground my radio and my random wire antenna?

I have an end fed random wire antenna about 50 feet from my shack into an antenna tuner. I do not have the option to install a ground rod at the house entrance but I do at the antenna feed point. The ...
0
votes
1answer
118 views

Where am i supposed to ground the audio path?

Where does the ground of the audio path go in this schematic?
2
votes
1answer
126 views

Which is Better to Use with Vertical Monopoles: Buried Radials or Ground Screens?

Many threads posted on various websites over the years have included statements/beliefs on this subject, but support there for the accuracy of those statements sometimes is minimal. An accurate ...
7
votes
5answers
205 views

Coax fed dipole: shield goes to one side, yet is grounded via chassis line to Earth

Suppose I have a coax-fed half-wave dipole antenna. The coax shield goes to one side of the antenna, the center conductor to the other side. The transceiver's chassis is connected (via the coax ...
0
votes
1answer
115 views

Is a lightning arrestor required with a ground rod?

I am building an out building ham shack. I am planning to install an 8 foot ground rod for the antenna. Does the radio require an additional ground to the rod as well or do I need to install a ...
2
votes
2answers
89 views

Does RF go through thin corrosion better than DC?

I might have a bit of a problem with my groundplane, but I am unsure. I am using a ground screen instead of radials. The problem is the ground screen is made of galvanized metal, but I can see that a ...
0
votes
2answers
101 views

ISOTRON 80m 75m Antenna Position

I know, a dipole is the way to go, but cannot fit one, only a 'birdhouse' antenna like the 75m 80m Isotron antenna. Is it better to put at 15 feet Above Ground Level outside, or 20 feet AGL ...
3
votes
1answer
114 views

Does copper wire get sold as flat straps to reduce inductance?

The extra book (11-9) safety section mentions that a "large diameter wire, or even better, a wide flat strap, has the lowest inductance and makes the best ground connection." Does anyone actually have ...
1
vote
1answer
112 views

Grounding for an upper floor shack

My shack is on the second floor, 4m from the ground. My main antenna is a base loaded vertical, using the metal roof (10x6m) as a ground plane. When I operate in 20 and 40 meters, it's pretty ...
2
votes
2answers
74 views

Grounding of a portable setup

I am occasionally using an extremely simple shortwave portable setup consisting of a battery, the transceiver, a short coax feedline and a vertical half-wavelength vertical antenna with a transforming ...
4
votes
2answers
291 views

How do I interpret the FCC ground conductivity map files?

The FCC has .seq files that show ground conductivity which it makes available for download. Unfortunately, there doesn't appear to be any documentation that comes with the files, or even headers. I ...
3
votes
2answers
390 views

Grounding a chimney mounted antenna

I'm installing a new antenna mast to hold one or more antennas. The new mast will be strapped on to a chimney near the center of my house. Coax will run down the mast, across the roof, down the side, ...
3
votes
1answer
265 views

What are the effects of a ground plane under a horizontal dipole?

What are the effects on signal propagation if this ground plane is just a metal object and what are the effects if the ground plane is actually grounded? I am asking this question because someone ...
1
vote
3answers
498 views

Do I have to disconnect antennas during thunderstorms?

lightning damage can be extensive and costly, its even life-threatening. If I have properly grounded the equipment and have a Surge protection device, do I have to disconnect the antennas during the ...
2
votes
1answer
133 views

Ufer ground and ground rods

I am about to build a new house with a ham shack incorporated in it. I am considering installing number 4 copper wire in the foundation around the perimeter as my ground ring. Is it necessary to ...
1
vote
2answers
657 views

Counterpoise/ground/radial options for an Inverted L

I have two 10-meter masts to support a 40-meter inverted L. I have a decent enough sized yard that I have a few options for counterpoise/ground/radial. I could run 1/4 wave radials in several ...
1
vote
4answers
1k views

Is the ground on the back of the Icom IC-7300 an electrical or RF ground?

On the back of the Icom IC-7300 there's a ground connector: The manual goes on to say this: Is this an electrical or RF ground?
2
votes
2answers
121 views

What's the earth in this antenna exactly?

This antenna: comes with an balun (or unun) that has three connectors. One for the coaxial cable to the radio, one for the antenna and one for the earth. My understanding is that the earth is an RF ...
1
vote
2answers
254 views

Wiring questions: grounding, attic antennas, BNC connectors

I am upgrading from an HT to a Kenwood TM-V71A. Yay! But this means I need to install some antennas and run feed lines into my shack. I'm going to be installing antennas in my attic (the feed lines ...
0
votes
3answers
381 views

RF ground and balanced antennas

Suppose that a ham radio setup uses several antennas with a 50 ohm coaxial switch to operate some natively unbalanced antennas and some balanced ones through baluns at the feedpoint. An RF ground for ...
3
votes
1answer
494 views

Is a J-pole an appropriate antenna for mounting to a steel handrail?

Last year, a group of us placed a battery-powered 2m digipeater using a J-pole antenna on a mountaintop. We're planning on doing the same this year except we plan to use a surge arrestor from the feed ...
3
votes
1answer
128 views

Electrical Earth

I have moved to a new flat which is on the 4 floor, luckily the landlord has let me put an OCF dipole outside with coax feeding through an existing hole in the window frame. I'm looking for some ...
3
votes
2answers
556 views

Antenna installation for a base station

I have a detached garage that is approximately 15 feet high. The garage is approximately 20 feet from my home I will be using a Kenwood D-710GA radio, a Grandmaster SWR Meter and a 6 foot comet GP-3 ...
3
votes
3answers
266 views

How do I get my crystal radio to receive?

My 8 year old and I are trying to figure out how to get this crystal radio we made working. It's based off this youtube video. We get clicks when we put the crystal ear piece either side of the ...
1
vote
1answer
378 views

Grounding plan for new ham shack - good/bad idea?

I have been researching and trying to plan out how to run the grounding/cables for a new ham radio room that will be in a new cabin being built. Since I am starting with dirt, I should have ...
3
votes
2answers
331 views

Not-too-distant saltwater ground

Problem I'm planning on mounting a vertical HF multiband antenna on the edge of my roof. Due to the presence of a paved walkway and some other similar property constraints, I have no room for ...
1
vote
1answer
655 views

SDR - discone antenna setup

Here's a picture of my SDR receiver setup... This entire setup lives indoors as I'm not able to put anything up on the roof right now. My understanding of a discone antenna is that the downward ...
3
votes
3answers
481 views

Baofeng radio produces hum when plugged into charger

So I am working on a low cost ham radio beacon using my Baofeng UV-5R radio because it is easy to use and portable. I built a simple PTT interface for a Raspberry Pi and wrote some python to transmit ...
4
votes
1answer
920 views

Antenna, input and ground bonding

I'm new to this and am in need of guidance. I am mounting a multi-band antenna on a 50 foot tall 1 1/4" galvanized mast. I plan to drive a ground rod at the base of the antenna and bond the mast to ...
2
votes
3answers
2k views

Lightning protection by disconnect

Currently I am evaluating options for my antenna's in regards to lightning protection. My setup is a physical disconnect of all my antennas using an outside "patch panel". So every time I power up ...
4
votes
4answers
3k views

I am installing a ham radio and want to properly ground it

I am installing a ham radio and want to properly ground it. I will be including a lightning arrester that will also go the the ground. I will have a 20' mast with a long wire antenna running 130+ ...
2
votes
2answers
793 views

Grounding Help - Where To Route My Wires

Here is my situation. My antenna mast is on the opposite side of the house from my ham shack, same with the power service entrance. I have installed ground rods roughly every 16 feet with #6 wire ...
1
vote
2answers
963 views

MIC microphone ground vs common (PTT, chassis etc) ground

How do we reconcile the ground connection between audio eqp (TNCs, soundcards etc) and transceiver? Most of the audio eqp for digimodes has only one ground. I've seen that the common practice is to ...
0
votes
1answer
253 views

guard planes in differential antenna PCB designs

The designs I have seen all seem to have this surrounding stitched-to-the-ground copper pour surrounding them. Why put it on a differential antenna PCB like below ? And why are those thin lower left ...
3
votes
3answers
1k views

What do you connect antenna Radials to?

I am trying to communicate between two arduino microcontrollers using radio. For this purpose I am building a whip antenna with 4 ¼ wave radials. I've done a bit of reading and have got most of it, ...
4
votes
4answers
4k views

Grounding a dipole

How do you properly ground a dipole (RX only for VHF scanning) to protect it against ESD/lightning? In my set up i'm putting a dipole on my roof. I've connected the two dipole elements together with ...
5
votes
1answer
420 views

How can I counter DC-DC inverter noise / ground noise in an electric-vehicle mobile setup?

So, I'm relatively new to all this; and I've gotten an ICOM IC-7100 on sale, which looks like an excellent transceiver … unfortunately, this very specific line shows up in the manual: The ...
4
votes
1answer
997 views

Bonding of Coax shield to RF ground conductor for long ground runs?

My shack is on the second floor of my home, and I run a single operator, 2 radio contest setup. The two coax runs pass through the wall and drop down to an antenna switch approximately 15 feet from ...
2
votes
5answers
750 views

What would be the easiest and most cost effective ground system for a startup UHF/VHF station

I just passed both my Technician and General Class license this past weekend, and am now contemplating my first station. To get my feet wet I'm planning on getting a Yaesu FT-7900R Dual band Radio ...
2
votes
4answers
1k views

Is my ground plane good?

I have a Cobra HG A1500 on a 1998 Ford Ranger. Due to clearance issues I cannot mount it on my roof, so I put it in front of my windshield by the wipers. Will this give me good enough ground plane to ...
2
votes
1answer
970 views

Why does a counterpoise need to be grounded

I made a 1090Mhz antenna for ADS-B following the instructions from sprut.de. The antenna looks like below and I made it from the copper centre of some stripped coax: The instructions say: Now we ...
1
vote
2answers
157 views

Does a station that's only going to receive require grounding

So I'm looking at building a satellite receiving stations (amateur bands). I know that a station that is transmitting requires grounding of the RF components due to the high power of the transmitter, ...
2
votes
1answer
257 views

Should I ground a 2 array crossed yagi-uda antenna?

I am using 2 array crossed yagi-uda antenna operating at 437.025 MHz. Where and how should I ground it? Should I ground at mast of antenna or to its metallic boom?
9
votes
4answers
16k views

Should I ground my radio to the chassis or battery for a mobile install?

From what I've seen, there are generally two ways to power a mobile radio: Positive lead to battery, negative lead grounded to chassis Both positive and negative leads to battery I know that ...
2
votes
1answer
358 views

Low frequency noise on ground line. Why?

I'm currently experiencing what I think is induced coupling on my ground line. Can someone explain how this is possible? I live on the third floor of an apartment block and my only grounding option ...
3
votes
1answer
1k views

Counterpoise from artificial ground vs base of antenna

I have an MFJ-934 tuner/artificial ground for my MFJ-1699 multi-band vertical (stuck on a balcony, so limited HF antenna options), and I'm wondering if there's any downside to the counterpoise ...
9
votes
5answers
3k views

Grounding a second-story shack with an outdoor antenna

My shack is on a second story, really far away from the house ground. To run a ground from my equipment to the outside/ground is a run of at least 60-75 feet. The antenna is at least 100 feet away as ...
2
votes
1answer
1k views

What are the effects on an ATAS-120A screwdriver antenna with a limited ground plane?

I'm going to be installing an ATAS-120A screwdriver antenna at the corner of a metal roof building, without radials going out over 270 degrees of the plane it's on. Will this significantly change the ...