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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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3 votes
1 answer
89 views

How do you ground a EFHW?

How do you ground a EFHW? Google says you have to use a counterpoise. How do you do that? Google says a counterpoise is just some radials. How long should it be? I did an experiment to try and use a ...
2 votes
2 answers
110 views

How do I ground my first HF rig?

I want to preface this question saying that I am very new to HF and just got my general license. I have only operated using 2m/70cm handhelds and am completely unfamiliar with antenna setup. I ...
0 votes
1 answer
185 views

Circular polarization

I'm installing my first beam antenna. I have 2 connection points, one for vertical and 1 for horizontal. So far. I have not found a lot of information which would be better. To run them separately or ...
1 vote
2 answers
185 views

Does a grounding block on a Yagi antenna with a balun and coax feed have the potential to add signal interference?

I have a commercial UHF/VHF Yagi designed for TV reception, also used for 2 meter reception, that has been installed for years but seems lately there's increasing amounts of signal disruption. I have ...
3 votes
1 answer
310 views

Bonding ground rods for lighting protection

I am installing 2 antenna masts on one end of my house. The utility ground is on the far end of the house, and was buried under the asphalt driveway. Working with my electrician, he suggests 2 ground ...
2 votes
3 answers
551 views

Monopole antenna with no ground connection

I have a SDR device and have a question about using a monopole antenna with them, but the question could be applied to any device which uses an antenna. SDR comes prepacked with a monopole antenna ...
0 votes
1 answer
1k views

How to ground a transceiver in an apartment?

I've got some really dumb questions about station grounding. For starters, I live in an apartment; how can I ground a transceiver station using that screw on that back? I've got nowhere to sink a ...
4 votes
2 answers
4k views

Can I connect my station ground to my house's ground rod?

I'm setting up my first HF rig and I'm reading a lot of conflicting information regarding station grounding. Can I connect my HF rig/station's ground to my house's ground rod or do I need a stand-...
3 votes
2 answers
934 views

How to establish RF ground for 1/4 wave vertical in apt on 3rd floor (about 35ft above the ground)

I am struggling to understand how to introduce an MFJ-931 artificial RF ground into my current system and am hoping for some help to sort out best practices. Although my use-case seems pretty common, ...
3 votes
2 answers
602 views

HF vertical 1/4w antenna on a tin roof?

I would like to build a 1/4 ~ vertical antenna on my tin roof for a ground plane. Does the angle of the roof matter? Should the antenna be vertical, or perpendicular to the roof? Would it be better ...
2 votes
0 answers
163 views

What is the best way to ground a whip antenna in a hotel room?

We have a 102" CB whip antenna cut for 10 meters. We're staying in a hotel and trying to figure out the best way to ground this antenna. Right now we're using a pile of wires on the floor, but we'...
6 votes
2 answers
229 views

Where can one get a "listed" SO-239 lightning arrester?

According to this summary of NEC requirements for radio antenna grounding (from 2014, but hopefully still somewhat accurate): https://www.mikeholt.com/files/PDF/Radio_and_Television_2014NEC.pdf It ...
1 vote
1 answer
2k views

What balance (radials or counterpoise) do I need for a vertical hamstick as a stealth antenna?

I'm just getting back into operating after a long break. I'm currently in a ground-floor apartment of an old four-plex and I'm trying to set up a stealth-like antenna for HF. I decided on the Shark ...
1 vote
2 answers
4k views

How to best ditch the counterpoise of a random wire antenna?

The "ground" has several effects on antennas, most of them negative (see e.g. Why does an HF "monopole" need dozens and dozens of radials while a VHF/UHF "ground plane" ...
4 votes
2 answers
826 views

VNA basics, antenna coax cable

Recently purchased my first VNA (Nano VNA) and I'm trying to learn the basics. I have a 150MHz 1/4 wave whip antenna that I need to install on a large metal object so I was hoping to use a VNA to help ...
1 vote
2 answers
725 views

Why do mag mounts not achieve proper grounding seeing as the coax outer connects to ground?

Diamond instructions for my CR8900 antenna state that proper grounding is required for the antenna to work. The battery negative is already grounded and has continuity to the coax outer so isn't the ...
1 vote
0 answers
43 views

Grounding an Inverter, good or bad if also plugged into a grounded AC Outlet? [closed]

If you have an DC/AC Inverter with a AC Transfer switch (so it also connects to grid power AC/110V to pull power from the grid when/if the 12V battery source drains down), and the inverter ...
4 votes
5 answers
843 views

Antenna grounding / bonding in relation to my AC service (with pictures)

I'm trying to figure out how to properly connect new ground rods for an antenna to my main panel. Any advice from those who have done this + have great electrical knowledge would be greatly ...
1 vote
1 answer
839 views

Grounding on second floor

I need to ground an upper floor shack, but I do not know very much about grounding. I have a Pathfinder dipole by Radio Wavz and I don't believe I need any RF grounding, but as for safety and ...
4 votes
2 answers
275 views

Mounting a hex beam on top of a high urban building

I am moving into a new apartment in the city soon which is on the 24th and last floor of an apartment building. I will have access to the roof of the building also. I'm still trying to understand ...
4 votes
5 answers
4k views

Do modern radios and power supplies require grounding for safety?

Do modern radios require grounding to be used safely? All I am concerned about is not getting electrocuted when I attempt to use the radio. I'm not concerned with RFI or Lightning safety at this point ...
4 votes
3 answers
629 views

RF ground confusion

I'm a bit confused by RF grounding. Let's take a HF 1/4 wave vertical antenna for example. When current flows through the centre of the coax to the antenna, my understanding is that the current then ...
1 vote
2 answers
754 views

How to weather protect lightning arrester mounted directly on ground rod?

I have a very simple home HF setup, just one wire antenna. I'm having a ground rod installed soon, and am planning the best way to set up my exterior buss bar. I'd really like to do an all-in-one ...
2 votes
1 answer
710 views

Where to disconnect feed line for lightning safety?

I recently moved to a storm prone area, so I plan to disconnect my shack connections when not operating. An electrician is helping me install a ground rod (bonded to my utility ground) soon, but I ...
-1 votes
1 answer
75 views

Acoustic Communication issues [closed]

[![I've attached schematic, I am connecting transducer directly to that header pins on receiver side. On transmitter side I am connecting op-Amp to boost voltage to +10v -10v.][1]][1]I am working on ...
6 votes
5 answers
2k views

Grounding a vertical antenna from a balcony

I have a multiband vertical antenna mounted onto the railings of my balcony apartment high up on the 6th floor of an apartment building. The antenna is not grounded. This antenna comes without radials....
3 votes
1 answer
1k views

Can I use electrical ground / earth as my RF ground?

I live on a high floor in an apartment block and have a radial-free multi-band vertical antenna attached to my terrace railing. This is the antenna : https://www.thunderpole.co.uk/amateur-radio-...
3 votes
1 answer
935 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 ...
20 votes
2 answers
15k views

How to detect common-mode currents or “RF in the shack”?

Let's say we already know that if your antenna is not suitably constructed or connected then you can get current on the shield of your coaxial feed line which will flow through the shielding/grounding ...
11 votes
5 answers
34k 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 ...
1 vote
4 answers
900 views

Why are many ground radials preferable to a single ground stake buried 1m deep?

Surely a 1m copper stake provides better ground connectivity for a vertical dipole?
3 votes
2 answers
98 views

Should the earth rod be incorporated in the total length of an RF grounding system?

I have installed a grounding system just outside my radio shack and was careful to avoid a quarter wavelength or multiples thereof (for single band use), or anything in total length that is close to ...
2 votes
3 answers
790 views

Why is outer coax usually grounded?

I'm building a simple ground plane antenna for VHF, and I'm doing some research on grounding in case I want to permanently install it. I keep hearing that the ground rod is connected to the outer coax ...
0 votes
1 answer
108 views

Ground pass through cinder block — copper pipe, braid, stranded?

What’s the best way to connect a station (desk) ground bus to an outside ground rod? Is it viable to double-sleeve a copper tube through existing PVC pipe? For coax pass thru, I have a 1.5” PVC pipe ...
4 votes
5 answers
10k 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 ...
1 vote
2 answers
338 views

Does Improving Earth Conductivity Near a Buried Ground Rod Improve Antenna System Performance?

The suggestion has been made on various ham-related websites that improving the conductivity of the Earth around a ground rod produces a worthwhile improvement in the e-m radiation from a vertical ...
2 votes
3 answers
5k views

Why is it bad to put ground rods too close together?

It's understood that ground rods should be spaced by a distance equal to twice their length. I read one source that claimed reduced effectiveness if the rods are closer than that. Is that correct? ...
3 votes
2 answers
757 views

Connecting copper strap to grounding rod

Is there a way I can connect a 2"x.025" copper strap to a 5/8" grounding rod that can be buried? I've seen the bolt-on strap clamps, but those need to be inspected periodically. I've ...
2 votes
2 answers
361 views

How far from a cable entry point can the lighting suppressor be installed

I'm installing a transceiver in an office on the ground floor of a warehouse. The antenna will be 45 feet above the office on the roof of the warehouse. The ceiling of the office is a drop ceiling, ...
5 votes
4 answers
7k 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+ ...
3 votes
4 answers
3k 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
0 answers
854 views

4NEC2 radials & grounds

Teaching myself 4NEC2 and have most of it under control, which is good. Regarding radials & grounds, i've been learning the "rules" NEC(2) has, summarised below. 4.1. Free space. In the ...
1 vote
1 answer
54 views

Is a Buried Ground Rod for the A-C Mains Service Entrance to a Building Also Useful as an R-F Ground?

A NEC4.2 analysis of the performance of a buried ground rod at the A-C mains entrance of a building shows it be ineffective in removing the common-mode r-f current that can flow along the OD of the ...
4 votes
1 answer
540 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
1 answer
401 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
1 answer
2k 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 ...
8 votes
5 answers
2k 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 ...
5 votes
2 answers
907 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 ...
1 vote
1 answer
183 views

Where am i supposed to ground the audio path?

Where does the ground of the audio path go in this schematic?
2 votes
1 answer
383 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 ...