RCCrawler Forums

NeoSlayer888 · 09-23-2004, 09:47 PM

I would post this in the Radios, Servos, and Batteries section but am hoping for a quick answer. Can some one explain why the FCC says I can’t use 72 MHz for a ground radio? I am looking for a new radio and have found some that I like but they are 72 MHz. I have searched google and all I got is that it is illegal to use a 72 MHz radio for a ground vehicle. www.fcc.gov/oet/spectrum/table/fcctable.pdf+FCC+72+MHz&hl=en]Here is the “THE FCC’s ON-LINE TABLE OF FREQUENCY ALLOCATIONS” <Click[/url]

KidWithAcrayon · 09-23-2004, 09:49 PM

I think that applys just if you are in competion in an event or something. Or, ur using ur car at an airplane field, etc. I am pretty sure there isn't a difference other than the frequency. They want airplanes on one frequency and cars on another. So, it should matter if ur not in an event.

Nomercy · 09-24-2004, 01:23 PM

okay your next door nighbor is flying his RC plane all over the nighborhood. hes using a 75 mhz raido. goodie for him. you decide to get out your crawler for a little low speed fun on the rock pile. yeaa. there goes little hanna down the sidewalk on her way to grandma's house. you nod and smile to her and go on about your business. you set your crawler down at the starting gate flip on the transmiter and the the reciver. give her a little go juice and you off. all of a sudden you hear hanna scream. your nighbors plane has swopped out of the sky and crashed into her. teh propeller is cought in her hair tearing it out, she puts her arms up and 'lop' there goes three fingers. grandma comes running out of the house and has a heart attack and dies. hanna is in serious need of medical attention. and your nighbor is white as a gost. hes thinks hes going to jail because hes just malled a helpless chiled and pretty much killed her grandma. he walkes inside grabs teh ole .45 and paints teh walls with his brains. but...

after a short investigation its found out that you were also using a 75 mhz raido. when you started crawling your siginal mixed with you nighbors and turned is plane into a missle of carnage.

get the picture. 8O

27 for groud and 75 for air. or something like that. also never use 40mhz, europe only. fcc catches you using that say good buy to the raido.

Distressed · 09-24-2004, 02:55 PM

I dont think this is right. 75 mhz can be used for ground or air it's the channels that differ. I got 2 hitec radios both pistol style and they are both 75mhz. I know that they are not for air use. and everyone that I use to race with were all on 75mhz but the channels were higher than those used by planes

KidWithAcrayon · 09-24-2004, 03:22 PM

75= ground

72= air

Jeckler · 09-24-2004, 04:16 PM

Ok, Nomercy painted the picture a little violently, but that's EXACTLY why the rules are the way they are. Please don't think it couldn't happen to you. Becuase you're right, it might not. But it might happen to someone near you.
There are exceptions. 50Mhz can run both. However, to legally operate a 50mhz rig, you have to have a Technician class or higher Amatuer Radio license. If you're smart enough to get one, you're proably smart enough to know when to use it.

KE6WCJ

EDIT: Apparently, 27mhz is also a legal aircraft band as well as land. From what I've found, it's very mnuch discouraged to operate aircraft on 27mhz though.

nktrnl · 09-24-2004, 06:28 PM

put in a overly dramatic nut shell yeah thats right.

FCC limits alot of crap (not in a bad way). FM, AM, XM, your microwave, computer, TV, cell phones. Just about everything that generates a radio wave. But its all in the saftey of the people.

Distressed · 09-24-2004, 06:40 PM

the only 72 mhz i know of is AM and i dont think that would be very good for flying. But there could be a FM 72mhz

Nomercy · 09-24-2004, 07:12 PM

thought you might like that. thought id try to be vivid so you understood. i knew my 27 mhz and 75 mhz wernt right but that it was something like that. my XS3 is 75 mhz FM. you can get teh XS3's in 40 mhz to but only in europe

Jeckler · 09-24-2004, 11:00 PM

Quote:

Originally Posted by Distressed

the only 72 mhz i know of is AM and i dont think that would be very good for flying. But there could be a FM 72mhz

99% of 72mhz radios are FM.

Distressed · 09-25-2004, 08:31 AM

ok i could be wrong but the losi xxxnt nitro truck came with a racio and i thought it was 72 am. I will look this up

Distressed · 09-25-2004, 08:38 AM

heck i cant even find any 72 mhz radios. I guess I am confused about AM being on 75mhz along with FM. sorry my BAD

Distressed · 09-25-2004, 08:42 AM

also 72mhz and 75 mhz can be used for air tower sells a radio that is both

http://www2.towerhobbies.com/cgi-bin...I=LXVX14**&P=0

NeoSlayer888 · 09-25-2004, 09:59 AM

It’s like this:

27MHz- AM; air or ground
50MHz- Ham band air or ground; but a license is required
72MHz- FM of PCM; air only
75MHz- AM, FM, or PCM; ground only

Jeckler · 09-25-2004, 10:08 AM

Quote:

Originally Posted by Distressed

also 72mhz and 75 mhz can be used for air tower sells a radio that is both

http://www2.towerhobbies.com/cgi-bin...I=LXVX14**&P=0

No they don't. If you'd have read the page, right below the picture, in the frequency availability section, it says "Surface". ***ALL*** 75Mhz radios are for use with land based craft ONLY!!!! Just because it has sticks doesn't mean it flys.

Quote:

Originally Posted by Distressed

ok i could be wrong but the losi xxxnt nitro truck came with a racio and i thought it was 72 am. I will look this up

Ok, it may have come with an AM radio, but it most definetly was not 72Mhz.

Try again?

Distressed · 09-25-2004, 10:36 AM

that says channel 11-60 is air and 61-90 ground. so like i said above it is the channels that differ not the frequncy, right?

NeoSlayer888 · 09-25-2004, 10:48 AM

Click for radio freq chart

Distressed · 09-25-2004, 11:02 AM

cool i was lookin for a chart like that

husky385 · 01-12-2009, 09:03 PM

I'm new but I gotta ask. What's the rules on 2.4 Ghz air radio on ground. Specifically using a Futaba 7ch? If legal is it even possible? If possible any one point me in the right direction on how to do it?

Thank you
Kevin

Espeefan · 01-12-2009, 10:30 PM

I'd say this only a problem if you happen to live near a park or air field where the plane or heli guys are known to fly. The morbid picture that Nomercy painted, could happen just as easily at an air field or a park, caused by other aircraft modelers flying on a frequency that was, or was not, already 'checked' out. Or it could also happen at a track, with the surface channels. You just have to use your head a little. Heck, the same thing could happen with an interferance siutation, involving no other RC modelers. It could be caused by something as simple as a viberation, or other radio electronic failure. Now days many PCM and spread spectrum radios go into a lock-out if they get conflicting signals. A lock-out condition is really not much different, except that many times the modeler can regain control if his fail-safe is set correctly.

09-23-2004, 09:47 PM	#1
NeoSlayer888 Quarry Creeper Join Date: Jan 2004 Location: CSU, CO Posts: 290	Radio frequency question I would post this in the Radios, Servos, and Batteries section but am hoping for a quick answer. Can some one explain why the FCC says I can’t use 72 MHz for a ground radio? I am looking for a new radio and have found some that I like but they are 72 MHz. I have searched google and all I got is that it is illegal to use a 72 MHz radio for a ground vehicle. www.fcc.gov/oet/spectrum/table/fcctable.pdf+FCC+72+MHz&hl=en]Here is the “THE FCC’s ON-LINE TABLE OF FREQUENCY ALLOCATIONS” <Click[/url]

09-23-2004, 09:49 PM	#2
KidWithAcrayon Quarry Creeper Join Date: Jul 2004 Location: Texas! Posts: 270	Re: Radio frequency question I think that applys just if you are in competion in an event or something. Or, ur using ur car at an airplane field, etc. I am pretty sure there isn't a difference other than the frequency. They want airplanes on one frequency and cars on another. So, it should matter if ur not in an event.

09-24-2004, 01:23 PM	#3
Nomercy Rock Stacker Join Date: Mar 2004 Location: Carroll County, Maryland Posts: 61	Re: Radio frequency question okay your next door nighbor is flying his RC plane all over the nighborhood. hes using a 75 mhz raido. goodie for him. you decide to get out your crawler for a little low speed fun on the rock pile. yeaa. there goes little hanna down the sidewalk on her way to grandma's house. you nod and smile to her and go on about your business. you set your crawler down at the starting gate flip on the transmiter and the the reciver. give her a little go juice and you off. all of a sudden you hear hanna scream. your nighbors plane has swopped out of the sky and crashed into her. teh propeller is cought in her hair tearing it out, she puts her arms up and 'lop' there goes three fingers. grandma comes running out of the house and has a heart attack and dies. hanna is in serious need of medical attention. and your nighbor is white as a gost. hes thinks hes going to jail because hes just malled a helpless chiled and pretty much killed her grandma. he walkes inside grabs teh ole .45 and paints teh walls with his brains. but... after a short investigation its found out that you were also using a 75 mhz raido. when you started crawling your siginal mixed with you nighbors and turned is plane into a missle of carnage. get the picture. 8O 27 for groud and 75 for air. or something like that. also never use 40mhz, europe only. fcc catches you using that say good buy to the raido.

09-24-2004, 02:55 PM	#4
Distressed Pebble Pounder Join Date: Jun 2004 Location: Oklahoma Posts: 140	Re: Radio frequency question I dont think this is right. 75 mhz can be used for ground or air it's the channels that differ. I got 2 hitec radios both pistol style and they are both 75mhz. I know that they are not for air use. and everyone that I use to race with were all on 75mhz but the channels were higher than those used by planes

09-24-2004, 03:22 PM	#5
KidWithAcrayon Quarry Creeper Join Date: Jul 2004 Location: Texas! Posts: 270	Re: Radio frequency question 75= ground 72= air

09-24-2004, 04:16 PM	#6
Jeckler Rock Crawler Join Date: Jan 2004 Location: Round Rock, TX Posts: 597	Re: Radio frequency question Ok, Nomercy painted the picture a little violently, but that's EXACTLY why the rules are the way they are. Please don't think it couldn't happen to you. Becuase you're right, it might not. But it might happen to someone near you. There are exceptions. 50Mhz can run both. However, to legally operate a 50mhz rig, you have to have a Technician class or higher Amatuer Radio license. If you're smart enough to get one, you're proably smart enough to know when to use it. KE6WCJ EDIT: Apparently, 27mhz is also a legal aircraft band as well as land. From what I've found, it's very mnuch discouraged to operate aircraft on 27mhz though.

09-24-2004, 06:28 PM	#7
nktrnl Quarry Creeper Join Date: Jul 2004 Location: 808 Posts: 261	Re: Radio frequency question put in a overly dramatic nut shell yeah thats right. FCC limits alot of crap (not in a bad way). FM, AM, XM, your microwave, computer, TV, cell phones. Just about everything that generates a radio wave. But its all in the saftey of the people.

09-24-2004, 06:40 PM	#8
Distressed Pebble Pounder Join Date: Jun 2004 Location: Oklahoma Posts: 140	Re: Radio frequency question the only 72 mhz i know of is AM and i dont think that would be very good for flying. But there could be a FM 72mhz

09-24-2004, 07:12 PM	#9
Nomercy Rock Stacker Join Date: Mar 2004 Location: Carroll County, Maryland Posts: 61	Re: Radio frequency question thought you might like that. thought id try to be vivid so you understood. i knew my 27 mhz and 75 mhz wernt right but that it was something like that. my XS3 is 75 mhz FM. you can get teh XS3's in 40 mhz to but only in europe

09-25-2004, 08:31 AM	#11
Distressed Pebble Pounder Join Date: Jun 2004 Location: Oklahoma Posts: 140	Re: Radio frequency question ok i could be wrong but the losi xxxnt nitro truck came with a racio and i thought it was 72 am. I will look this up

09-25-2004, 08:38 AM	#12
Distressed Pebble Pounder Join Date: Jun 2004 Location: Oklahoma Posts: 140	Re: Radio frequency question heck i cant even find any 72 mhz radios. I guess I am confused about AM being on 75mhz along with FM. sorry my BAD

09-25-2004, 08:42 AM	#13
Distressed Pebble Pounder Join Date: Jun 2004 Location: Oklahoma Posts: 140	Re: Radio frequency question also 72mhz and 75 mhz can be used for air tower sells a radio that is both http://www2.towerhobbies.com/cgi-bin...I=LXVX14**&P=0

09-25-2004, 09:59 AM	#14
NeoSlayer888 Quarry Creeper Join Date: Jan 2004 Location: CSU, CO Posts: 290	Re: Radio frequency question It’s like this: 27MHz- AM; air or ground 50MHz- Ham band air or ground; but a license is required 72MHz- FM of PCM; air only 75MHz- AM, FM, or PCM; ground only

09-25-2004, 10:36 AM	#16
Distressed Pebble Pounder Join Date: Jun 2004 Location: Oklahoma Posts: 140	Re: Radio frequency question that says channel 11-60 is air and 61-90 ground. so like i said above it is the channels that differ not the frequncy, right?

09-25-2004, 10:48 AM	#17
NeoSlayer888 Quarry Creeper Join Date: Jan 2004 Location: CSU, CO Posts: 290	Re: Radio frequency question Click for radio freq chart

Sponsored Links

09-25-2004, 11:02 AM	#18
Distressed Pebble Pounder Join Date: Jun 2004 Location: Oklahoma Posts: 140	Re: Radio frequency question cool i was lookin for a chart like that

01-12-2009, 09:03 PM	#19
husky385 Rock Stacker Join Date: Jan 2009 Location: Eugene Posts: 64	I'm new but I gotta ask. What's the rules on 2.4 Ghz air radio on ground. Specifically using a Futaba 7ch? If legal is it even possible? If possible any one point me in the right direction on how to do it? Thank you Kevin

01-12-2009, 10:30 PM	#20
Espeefan Rock Crawler Join Date: Jun 2006 Location: Wisconsin Posts: 570	I'd say this only a problem if you happen to live near a park or air field where the plane or heli guys are known to fly. The morbid picture that Nomercy painted, could happen just as easily at an air field or a park, caused by other aircraft modelers flying on a frequency that was, or was not, already 'checked' out. Or it could also happen at a track, with the surface channels. You just have to use your head a little. Heck, the same thing could happen with an interferance siutation, involving no other RC modelers. It could be caused by something as simple as a viberation, or other radio electronic failure. Now days many PCM and spread spectrum radios go into a lock-out if they get conflicting signals. A lock-out condition is really not much different, except that many times the modeler can regain control if his fail-safe is set correctly.

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