AMA rules re my DIY radio

Skywise · 2010-11-06T23:03:14+00:00

The following is information relevant to the ongoing discussionas to whether and how I can build my own 2.4 Ghz radio systemand use it to fly remote controlled aircraft.This post ONLY regards AMA rules. I will address FCC rules inanother post at a later date.Reference the AMA Membership Manual 2010 as found at, Page 9 - Radio Control Operation Operation of Flying Sites Transmitter Requirements: Narrowband transmitters are required for use with all channel number frequencies (CH 00-09 and 11-90). Identification of narrowband transmitters 3. AM transmitters that were verified by test to be narrowband prior to March 1998 are considered to be narrowband. A goldcolor sticker, marked ?R/CMA AMA - RF CHECK? was formerly used to identify these tested transmitters. However, it is no longer required to display the R/CMA AMA Gold Sticker on these transmitters.This clearly shows that the Gold Sticker only applied to 50, 72,and 75 Mhz bands, as those are the only ones which have channelnumbers. 2.4 Ghz uses spread spectrum and therefore does not usechannel numbers.Further, it clearly sates that this in no longer required.So that takes care of the Gold Sticker argument. Page 10 - Frequencies for Radio Control 1.4. RC is permitted in the 2.4 GHz industrial, scientific, and medical (ISM) band using spread spectrum technology from 2.4 GHz to 2.485 GHz.Self explanatory. Page 11 - FCC Legal Requirements and Safety Recommendations 3.0. RC users shall comply with FCC regulations. RC users of the Low Power 2.4 GHz band are required to comply with CFR Part 15. The AMA will not assume responsibility for enforcement of the CFR. However, if the violation impacts safety, corrective action may be taken.The last only applies if there is a safety issue. Even if thereis an FCC violation, the AMA clearly states they don't enforceFCC rules, and clearly states they only care if there is...

Nov 06, 2010 26 Replies

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Ray Haddad 15 years ago

Of course. You have ignored regulations that apply to ALL bands and focused on the relaxed regulations regarding licensing.

No, and I won't. I'm not your research assistant. You couldn't afford me and I don't waste my time like you seem to do. I do not suffer fools like you for long. You're getting more attention than most because you do seem like a genuinely nice guy even though you don't provide me with an e-mail address to contact you with. If you did, I might provide you with personal references that would give you more confidence in what I tell you. But then, you are a fool at the moment.

But you could get better.

-- Ray

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Skywise 15 years ago

Ray Haddad wrote in news: snipped-for-privacy@4ax.com:

I learned a long time ago not to post with my real email address.

Look in my signature below. There you will find a link to my personal website. On that page you will find my email address.

Brian

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Martin X. Moleski, SJ 15 years ago

On Sun, 7 Nov 2010 14:34:18 -0500, "Morgans" wrote in :

Heh heh. I was opposed to him in that thread, too. I'm pretty sure I've got a quart of MEK on my work shelves.

Good memory, JS!

Marty

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Ray Haddad 15 years ago

I wasn't paying attention. Mea culpa.

I'm terribly busy now that the business day has come upon Australia so I will contact you later.

-- Ray

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Ray Haddad 15 years ago

in :

Hey, I would have brought it up but figured by now all those in favor of it were dead. Glad you're not.

-- Ray

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Doug McLaren 15 years ago

| Full telemetry in the 2.4ghz band is a cakewalk today compared to the | way it was 10 years ago. Spread spectrum is not. It requires precise | timing, code hopping algorithms and fast processors.

Of course, many full telemetry setups used today in 2.4 GHz do use spread spectrum.

And if somebody is going to make something that uses spread spectrum themselves nowadays, they'll probably just use an off-the-shelf module of some sort -- let somebody else worry about the "precise timing, code hopping algorithms and fast processors".

And spread spectrum isn't THAT difficult. At the simplest level, remember -- it was invented in the '40s. Modern stuff is better, of course.

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