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Questions tagged [safety]

Questions about safely installing and operating ham radio equipment in homes or vehicles.

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3
votes
1answer
75 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 ...
0
votes
0answers
25 views

Is there and data anywhere showing if amateur radio operators are more likely to get cancer from exposure to RF?

Is there and data anywhere showing if amateur radio operators are more likely to get cancer from exposure to RF ?
6
votes
2answers
164 views

Do lightning rods attract or do they help prevent lightning?

I'd read that the current theory of how lightning rods protect a house, antenna tower, or other structure is by preventing lightning from striking -- that is, the sharply pointed rod lets charge ...
3
votes
4answers
148 views

How is working on DC high voltages as in a tube radio different from 120VAC?

Suppose that I am familiar with the safety procedures for working on 20 A 120 VAC 60 Hz household lines. What should I be prepared for before working on high voltage DC circuits (say, 800 volts) as ...
6
votes
2answers
80 views

distance between shack and antenna

I am putting a 40m antenna in my attic and I was wondering would it be safe to have a shack in the room right below the attic (10ft of coax or less) or should I have my shack in the basement/ground ...
8
votes
1answer
95 views

overhead power-line safety

A set of utility lines, and above them some high voltage power lines, run almost directly over the backyard fence. Some radio antennas are situated so that they can't fall onto the utility or power ...
2
votes
2answers
223 views

How to supply high voltage to an amplifier in a safe way?

The grounded-grid amplifier that I am looking at requires 1100 volts Max. How do I safely deliver this rated voltage without getting hurt? Should I consider a alternative amplifier? By request here ...
3
votes
2answers
253 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 ...
2
votes
3answers
154 views

Can the tip of an antenna burn insulation/drywall?

In my house, I’ve got a mag mount antenna mounted on a piece of sheet metal on top of rubber and the tip of the antenna goes into my ceiling and possibly contacts or is near to home insulation. I was ...
1
vote
4answers
657 views

Is it safe to live close to cellular antenna?

I saw some apartment in my county in a very good location (quite close to the beach), however, the rent is very cheap. The apartment is the highest on that building, on top of this building there is a ...
3
votes
1answer
619 views

why do some radios have two fuses in the power leads

On a number of fairly modern rigs I've seen that both power leads are fused: Why is this still so? Does this have something to do with some vehicles having a ground-positive system or is this simply ...
2
votes
2answers
86 views

How to safely listen to my transmitted signal with a second receiver

I would like to listen to my own transmitted signal using a second receiver and connecting one into the other could possibly be a bad idea ;-) so How can I safely tap into my transmitted signal ...
2
votes
2answers
192 views

How much EMF does a typical scanner put out?

I am not terribly interested in hearing about whether or not EMF/RF is hazardous to ones health (as this is frequently discussed in my house). What I would like to know is; how much EMF/RF does an ...
6
votes
2answers
242 views

Does amateur radio induce a health risk?

Electromagnetic Exposure wise, does Amateur radio (Particularly 1.8 to 440 megahertz) induce a health risk due to RF radiation? Other than the Maximum Permissible Exposure (MPE) limits, which will ...
14
votes
2answers
2k views

If I install a G5RV in my attic how could I be certain there are not harmful levels of RF in the shack, or my kids bedroom?

I assume that anyone who has a G5RV or G5RV junior in their attic has done so with ceramic spacers, and has zigzag or dog-leg installations, or otherwise has contorted the antenna to fit up there. My ...
8
votes
2answers
890 views

How to keep a disconnected coaxial connector weatherproof?

The advice I have seen on lightning safety is that if you don't have high-quality lightning protection (and associated grounding) installed on your feed line, it is advisable to, during a storm and ...
6
votes
2answers
2k views

DIY lightning arrestor - gap size?

I have an antenna that's well above the treeline, and I've heard I can add some small amount of protection by placing two bolt heads a short distance from each other, one connected to the antenna, the ...
9
votes
3answers
5k views

What is the electrical shock risk of an antenna?

I've seen people refer to avoiding touching an antenna or bare transmission line that might be transmitting. What voltage potentials and currents are commonly found on typical ham radio antennas? Do ...
14
votes
4answers
2k views

How can RF exposure hurt you?

In studying for the exam, one question came up about RF Exposure. G0A 07 What effect does transmitter duty cycle have when evaluating RF exposure? My ...
8
votes
4answers
2k views

Has a vehicle magnetic antenna mount ever caused a road accident?

Some people believe that mag mount magnets lose their effectiveness over time, eventually causing a dangerous situation as the antenna could rip loose from the vehicle and become a projectile or ...
18
votes
5answers
7k views

How can I protect equipment against a lightning strike?

A lot of aerials (almost by design) would be rather good attractors of lightning. What steps do I need to take in the field to keep my gear safe against a lightning strike? I'm presuming the obvious ...