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Legal Limit - 10/5/2012 7:06 AM   
JollyPopper



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From: Mountain Home, AR, USA
Status: offline 		I always assumed that any radio transmitter that we were able to buy here was legal as far as power output was concerned, but I never bothered to check into what the limit is. Does anyone know how many watts we are allowed in our transmitters and what are they actually putting out? I am using Futaba radios in the 2.4 ghz band.


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RE: Legal Limit - 10/5/2012 7:24 AM   
Silent-AV8R



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Status: offline 		125 mW is the max. Most US legal systems operate with 100 mW.

Here's the regulations

http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=2a92d0d7276ad133c1acc23a299641d3&rgn=div8&view=text&node=47:1.0.1.1.16.3.234.31&idno=47

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RE: Legal Limit - 10/5/2012 3:05 PM   
LesUyeda



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Status: offline 		"I always assumed that any radio transmitter that we were able to buy here was legal as far as power output was concerned,"

I can buy an automatic weapon, amongst other distructive weapons. That does not make it legal for me to have them.

Les

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RE: Legal Limit - 10/5/2012 4:12 PM   
Rafael23cc



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Status: offline 		When we used 72mhz radios, you could also buy the radio crystals, but that did not give you the authority to change them yourself. Notice I said radio crystals, I DID NOT say receiver crystals.

Additonally on 2.4 radios and the "global market" you can buy a radio intended for another country and be breaking laws in your country. Not as bad if you are in the USA, but in Europe the allowed max power is much less than in the US.

Rafael

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RE: Legal Limit - 10/5/2012 4:54 PM   
Silent-AV8R



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Status: offline 		If you are in the USA and your radio has an FCC ID number on it then you are legal to operate it in the USA.

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RE: Legal Limit - 10/5/2012 5:36 PM   
rmh



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quote:

ORIGINAL: Silent-AV8R

If you are in the USA and your radio has an FCC ID number on it then you are legal to operate it in the USA.

Yes and a number of the old last generation 72 setups had modules with removable crystals -
I had JR's that allowed changing of tx and rx crystals - no big deal.
I am a Ham licensed flier but no one ever checked on licensing for purchase of these crystal setups.

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RE: Legal Limit - 10/5/2012 5:52 PM   
Silent-AV8R



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Status: offline 		Did you walk to work?
No, I brought my lunch.

The OP was talking about his new 2.4 GHz spread spectrum radio.

No crystals to change, and that had nothing to do with power output either.

The Part 15 legal limit for our radios is 125 mW. Most brands put out ~ 100mW.

If his radio has the FCC ID/sticker, then it is legal.

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RE: Legal Limit - 10/9/2012 7:35 AM   
JollyPopper



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Status: offline 		The reason I posted the question is that someone had a transmitter for sale that he had bought in Hong Kong and shipped home to a relative only to find out later that it transmitter too much power to be legal back home. That brought up two questions to me. One was, what is the legal limit? Two was, who cares? If I had the radio here I would not hesitate to use it even if it were over powered. We don't have many radio cops nosing around at the field where I fly. However, before anyone calls the radio cops on me, the radios I already have are capable of controlling an airplane way beyond what my eyes will allow me to fly, so not to worry.


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RE: Legal Limit - 10/9/2012 3:08 PM   
LesUyeda



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Status: offline 		"We don't have many radio cops nosing around at the field where I fly. However, before anyone calls the radio cops on me, the radios I already have are capable of controlling an airplane way beyond what my eyes will allow me to fly, so not to worry. "

Nobody cares, UNTIL, you cause the interference that puts your plane into someone, and caused irreprable damage; or into someone's windshield, and causes a multiple car crash with injuries:-((((((((((((((((((((

Les

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RE: Legal Limit - 10/9/2012 3:20 PM   
BuschBarber


 

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quote:

ORIGINAL: LesUyeda

''We don't have many radio cops nosing around at the field where I fly. However, before anyone calls the radio cops on me, the radios I already have are capable of controlling an airplane way beyond what my eyes will allow me to fly, so not to worry. ''

Nobody cares, UNTIL, you cause the interference that puts your plane into someone, and caused irreprable damage; or into someone's windshield, and causes a multiple car crash with injuries:-((((((((((((((((((((

Les

I think the issue with using a transmitter that has more power than the legal limit in a particular country is the interference caused to the Non RC equipment in the area that would not have been affected if the legal RC transmitter power limit was observed. If you are suggesting that an overpowered RC transmitter could interfere with other RC transmitters then I can see your point.

When I was using 72Mhz equipment, we had a scanner that could pick up anyone transmitting on any of the 50 channels. If a ground vehicle nearby was using one of our channels illegally, there were no radio sheriffs around to catch them in the act, either. That did not make their actions acceptable. It is also a Moral issue. Just because you can get away with breaking the law does not make it right.

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RE: Legal Limit - 10/9/2012 8:01 PM   
JollyPopper



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From: Mountain Home, AR, USA
Status: offline 		I'm not saying it is "right" to use an overpowered radio. My point was why make laws or rules that are not enforced? And LesUyeda, do you believe that if I did put an airplane into someone's windshield and caused a crash with injuries that someone would examine the transmitter I was using? Maybe they would. I don't know. Anyway, the two radios I use are perfectly legal so it's a moot point.


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RE: Legal Limit - 10/10/2012 3:15 PM   
LesUyeda



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Status: offline 		"And LesUyeda, do you believe that if I did put an airplane into someone's windshield and caused a crash with injuries that someone would examine the transmitter I was using? "

You can bet your boots they would. And my insurance company would probably be leading the charge, so that you would have to pay for any damage caused, not them.

"Anyway, the two radios I use are perfectly legal so it's a moot point. "

It is a moot point ONLY if they are perfectly legal where you are using them.

Les

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RE: Legal Limit - 10/10/2012 3:50 PM   
JPMacG


 

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Status: offline 		A Tx that transmits too much power would not have an FCC sticker. It will not be approved by the FCC for sale in the U.S. I believe that owning a radio in the U.S. that has not been approved by the FCC is illegal. That sticker means more than just the power output is correct. It means the Tx has been tested for spurious, harmonic and other out-of-band emissions and has been found acceptable.

I believe this law is enforced. I have heard of the FCC confiscating shipments of unapproved electronic equipment. This is usually at the wholesale level, not the end user.

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RE: Legal Limit - 10/10/2012 3:55 PM   
JPMacG


 

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Status: offline 		By the way, the FCC just tests equipment to establish it won't cause interference. FCC doesn't care how well the equipment works for the intended purpose. That is up to the company producing the equipment.

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RE: Legal Limit - 10/10/2012 4:11 PM   
Sport_Pilot



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quote:

When we used 72mhz radios, you could also buy the radio crystals, but that did not give you the authority to change them yourself. Notice I said radio crystals, I DID NOT say receiver crystals.


That would be incorrect the rule everybody tried to claim on this was about the crystal in modules, not those exposed on the front of the radio.

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