Using the ARRL RF Exposure Calculator (

[@CrittendenIV]

Dave, you answered all the questions I woke up with... and I didn't even know you made this video! Thank you for all your wonderful help and guidance!!

[@david_W5QDF]

📻🎧 this symbolizes a radio since that is our hobby. The headphones symbolize I listen. This is my way of helping the KZbin algorithm and your channel. 📻🎧

[@TheWingnut58]

That's why I like QRP.....the calculator says "don't lick your antenna while transmitting" 😁

[@MichaelALoberg]

What if I have a sunroof in a metal roof, and can see the tip of the antenna? Thanks!

[@brentjohnson6654]

Thanks for another informative video. Thanks for answering my question. I was wondering about proper placement of a mobile VHF/UHF antenna in a vehicle with a 50W transceiver. I am aware this is not ionizing radiation and want to be compliant with the uncontrolled people. This is in regards to people innocently walking up to you or driving near you. So placing a VHF/UHF antenna on the hood of the vehicle would not be as advantageous since there is glass and not metal in the path of the RF. All of this gets to be academic. I am mainly interested in complying with the requirement to have these results in all my stations (qth, mobile, and portable). You make a great point about the HT. Since it is usually 5W, I didn’t worry as much about that. Thanks again, David. We pilots need to stick together. All the best now, 73 de KI5HXM.

[@N2Stooges]

Are the ARRL RF Exposure Calculator results valid per the latest FCC RF exposure regulations in 2021? Namely, if my ham station meets the ARRL calculator's minimum safe distance results then I'm OK in the eyes of the FCC without further evaluation needed?

[@davecasler]

Yes. I'd print things out from the calculator.

[@Obeeewaan]

one exception may be an aluminium roof that will still provide rf shielding without being mag-mountable...??

[@dgrunwald]

Just to clarify as long as I follow the distance from antenna in the calculator It’s safe exposure no Matter how many watts

[@johnsch2957]

I might have missed it in the video.. When is it appropriate to uncheck the ground reflection box?

[@davecasler]

If you're aeronautical mobile. Or in space.

[@johnsch2957]

@@davecasler Thank you!!! I have not seen this explained before.

[@g1hwy]

Hi Dave. Here in the UK the amateur op is excluded from the calculations. Only the general public, which includes your family are taken into account. An HT would most likely not be over 10watts EIRP so here it would be complaint anyway. I will give the ARRL calculator a go and see how it compares with the RSGB one. The RSGB one has a lot more options and they are working on various set ups we can plug into it. I have calculated my HF and VHF stations with the RSGB one and with the power I run I am ok as is. The only problem may be my vertical on the low bands as there is no calculator for those at the moment.

[@TeribullTeribell]

Hey so I have a question I was attempting to use this calculator to see the amount of radiation I would get from a rf guyed tower (seeing as I climb up right past all the antennas?)

[@marionbrown5651]

I was wondering how safe it is to live next door (15 metres) from a 4G tower? I wasn’t informed about this being installed

[@bruceweight7319]

Does the fcc require mobile installations to be papered at all times? I thought this was for fixed home style installations to have paperwork on file should the fcc choose to check your home.

[@johnbellas490]

Hello Dave!! What would be the typical gain of an INVERTED VEE antenna?? I have antenna's for 80, 40 and 20 meters presently, All are inverted V configuration. Thanks KC2UVN and 73's

[@davecasler]

About the same as a dipole. Even less directional than a dipole.

[@hughbassoon]

Thanks Dave. What would be radiation from a loop antenna and also from a magnetic loop antenna? Can I use the same formula? Hugh Jones VE7YJ

[@davecasler]

Use the same formulas. Be sure to take into account any gain in a large loop antenna.

[@Siskiyous6]

So, I need a combat helmet from WWII for using my HT, or tinfoil? Nice video Dave!

[@3dPrint_and_chill]

Good point. They are acting like RF is ionizing radiation. It's not a nuclear reactor! 🤣 Edit: My bad he mentions that at the end of the video.

[@mwechtal]

You really need more like a metal mask.

[@mwechtal]

@Spike S there you go! That'll do the job.

[@thom3124]

I did my RF Calculations at 100 watts all the way up to 448 Mhz and I am totally safe. Do a calculation on your cell phone!

[@maxheadrom3088]

What if your neighbors complain their fluorescent lamps are turning on and they can hear you talking on their cavity fillings:? BTW, some serious questions: is it really possible to hear AM radio on cavities? You know how early autumn is hot in the US? Well, early spring is cold in Brazil. I think the climate is changing - someone should look into that.

[@ButtonsKing]

If the car roof is not made of iron, a magmount will not stick to it, so a plastic or fabric roof is out of discussion.

[@RedNeckSurgeyTech]

Hi Dave, I've been watching for about 4 years. I was a late bloomer in Ham radio. I started at age 55. I have an issue not with breakers but rather with our air purifier. Every time I transmit on 40 meters, my air purifier in the bedroom goes from the low setting to the high setting 😅. Can't figure it out. It's an issue because I get up much earlier than my wife, and it wakes her up. Any ideas? Higher bands aren't great at night, so I just don't transmit. This comment is in reference to video # 540. The next video in my watch later list started playing before I finished my comment so it appeared here. 73 KF0ALT

[@phichi01]

Just a reminder, aluminum is non-ferrous, a magnet check won't find aluminum.

[@sheliumorg5189]

Something you should be questioning is why YT filters my comments. Are they really so obnoxious, unfitting, disturbing, dangerous? Maybe to the SQ of TPTSB?

[@davecasler]

KZbin (and I) will filter your comments for even mild profanity and anything offensive. Just state facts.

[@erpece]

There are people with a HAM licence that don't know about duty cycle and modulation types? :-O

[@davecasler]

It's not emphasized in the Tech manual very much.

[@jamesk0ua]

Dave, "metal" was a very poor choice of words. Magnets only stick to Ferrous metals. In other words steel and to varying degrees steel alloys. A magnet mount will NOT stick to aluminum, yet aluminum also acts as a shield just like a steel roof does. there are hundreds of "metal" alloy's that would act as a shield, that a Magnet WILL NOT stick to. Copper and aluminum are the most common.