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10-28-2009, 10:18 PM | #1 (permalink) |
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Join Date: Jan 2009
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So if I get 900mhz wireless system for my heli - I have to take, pass a RF license?
for 900mhz , that's all the thing we need to do is to take, pass the RF license? Otherwise I will get 1.2Ghz or 5.8Ghz since I'm using DX7
Tks for anyone input rcjpth |
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10-28-2009, 11:05 PM | #2 (permalink) |
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Join Date: Oct 2006
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You would be correrct. You will have to pass the technical class. See below
Technician Class License. You can get an entry level Amateur Radio Technician license by passing a 35-question multiple-choice examination. No Morse code test is required. The exam covers basic regulations, operating practices, and electronics theory, with a focus on VHF and UHF applications. Technician Class operators are authorized to use all amateur VHF and UHF frequencies (all frequencies above 50 MHz). Technicians also may operate on the 80, 40, and 15 meter HF bands using Morse code, and on the 10 meter band using Morse code, voice, and digital modes. No Morse code test is required. General Class License. The General Class license offers a giant step up in operating privileges. The high-power HF privileges granted to General licensees allow for cross-country and worldwide communication. Technicians may upgrade to General by passing a 35-question multiple-choice examination. The written exam covers intermediate regulations, operating practices, and electronics theory, with a focus on HF applications. You must successfully pass the Technician exam to be eligible to sit for the General class exam. No Morse code test is required. In addition to the Technician privileges, General Class operators are authorized to operate on any frequency in the 160, 30, 17, 12, and 10 meter bands. They may also use significant segments of the 80, 40, 20, and 15 meter bands. Amateur Extra Class License. The HF bands can be awfully crowded, particularly at the top of the solar cycle. Once you earn HF privileges, you may quickly yearn for more room. The Extra Class license is the answer. Extra Class licensees are authorized to operate on all frequencies allocated to the Amateur Service. General licensees may upgrade to Extra Class by passing a 50-question multiple-choice examination. No Morse code test is required. In addition to some of the more obscure regulations, the test covers specialized operating practices, advanced electronics theory, and radio equipment design. Dale
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10-29-2009, 12:29 PM | #3 (permalink) |
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As a new ham myself, I found the ARRL and FCC materials pretty complicated to navigate, because they all talk about what a licensed operator could do. That is a superset of what an unlicensed operator is allowed to do. The ARRL materials don't go out of their way to explain that even without a Technician license, you are still allowed to use some devices. In general, 900 MHz is not within one of the common "ham" service bands reserved for amateur-but-licensed use, which led me to try to dig up some information.
The common 900 MHz video transmitters are FCC authorized "low power intentional radiators." That is, they are transmitters. (Some devices have four channels, and the channels typically labeled 2 3 and 4 are more clearly out of bounds to amateur use, licensed Technician or not.) The FCC has published the following white-paper document to try to explain the Section 15 rules, but even that is pretty vague. http://www.fcc.gov/Bureaus/Engineeri...3/oet63rev.pdf Page 18 simply says how many microvolts-per-meter can be detected at a common given range, such as 3 meters. It says to see rule 15.231 for more info. The text on page 29 following the data gives a rough estimate of how to convert microvolts-per-meter into a practical output wattage. Maybe someone can plug in the actual variables involved for a standard off-the-shelf dipole ducky connected to a 500mW transmitter to say whether it requires an operator license or not. So I went to Section 15, rule 231 for more info. http://www.fcc.gov/oet/info/rules/pa...5_07-10-08.pdf (page 91) Periodic transmissions, are less than five seconds in duration, but un-intuitively, the cannot be on a regular recurring basis like every minute. This doesn't apply to us. Intentional radiators used for emergencies can be used through the emergency. (No surprise-- a genuine emergency allows a lot of leeway.) This doesn't apply to us. I don't see anything in the referenced rule 15.209 (page 82) that would clarify the radiation limits. For hobby or radio controlled vehicles, this leaves us with intentional radiators, limited to 12500 microvolts-per-meter at 3 meters. What that means in milliwatts, I don't know. How this limit changes with or without FCC Technician license, I don't know. If an amateur FCC license cannot be used for commercial purposes, but the general public can use it for commercial purposes (including revenue sharing from ad impressions from your YouTube video viewers!) without a license, that is also a gray area to me. With some of this stuff, the more you read, the less you understand. |
10-29-2009, 05:37 PM | #4 (permalink) |
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Thread Starter
Join Date: Jan 2009
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So does that mean if I buy the 900Mhz (preset to 910Mhz) FPV combo set and custom will call me to ask for license otherwise they won't release the package? Or if I buy from San Jose (I live in Los Angeles) the seller won't sell it until I show them my license?
If this requires the license and we use it without license, so the consequences will be either citation and/or arrested? I guess... It sounds like too much for the FPV - I'm already giving up now... tks for you' all rcjpth |
10-29-2009, 06:20 PM | #5 (permalink) |
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Negative. If you get a transmitter that operates inside the 900mhz ISM band (902-928Mhz) and is 1 Watt or less output, you don't need a HAM license.
References: http://www.adhocelectronics.com/ISM-...e-free-900-MHz http://en.wikipedia.org/wiki/ISM_band |
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