Questions tagged [united-states]

Questions specific to rules, regulations, and practices in the United States of America.

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3
votes
4answers
1k views

Is it legal to broadcast an FM radio signal with a Raspberry Pi Zero?

I saw a video lately where someone soldered an antenna to a Raspberry Pi Zero and broadcasted radio signals. https://www.youtube.com/watch?v=GXedC5dQyNk&t=9s They said they were not worried to do ...
2
votes
2answers
205 views

Laptop screen goes blank when transmitting from handheld within a few feet - sometimes

I noticed that when I transmit from my handheld Baofeng Radio, with the standard rubber duck antenna, that my laptop screen goes blank. This only occurs if I'm within a few feet, and even on powers ...
5
votes
1answer
109 views

What rules govern robotic teleoperations, when the remote device also transmits back telemetric information?

I was looking through the FCC part 97 rules for robotic teleoperation, and it cites a one-watt figure for "model craft". However, it also allows higher power transmissions for remotely operated ...
11
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1answer
398 views

Why does the FCC put restrictions on symbol rates?

This answer claims that Mostly, on HF, the FCC has chosen to limit modes of transmission and symbol rates rather than bandwidth Why does the FCC limit symbol rates?
2
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1answer
619 views

What are the FCC's bandwidth restrictions for the various amateur bands?

Does the FCC restrict how much bandwidth an amateur radio operator can transmit? I've seen restrictions for transmitting data, like packet and ATV, but, for example, could I legally use a huge ...
10
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1answer
293 views

What is emissions designator "E" when used as a type of modulation?

The FCC's rules regulating amateur radio, in 47 CFR 97.307(f), paragraph 8 defines one emissions standard/limitation as follows: A RTTY or data emission having designators with A, B, C, D, E, F, G, ...
6
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2answers
1k views

What "test transmissions" are allowed above 51MHz?

The ARRL's band plan chart includes the following text in its legend: Test transmissions are authorized above 51 MHz, except for 219-220 MHz What FCC regulation is this referring to? Aren't all ...
5
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1answer
280 views

Expected practices for one ham operating under another's privileges?

I understand that in the United States, amateur operators and even non-licensed persons may participate in domestic (and approved international) communications on bands they wouldn't normally be ...
5
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2answers
153 views

Air gapped digital communications mode on VHF?

According to this question MCW (modulated continuous wave) is allowed on large portions of the VHF bands in the U.S. Is using MCW suitable for passing small amounts of digital data between 2 PCs or ...
1
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1answer
85 views

Geting my Tech Licence again

Back in the 90's I received my Tech license. I let it expire. Now many years later and I have the time (Retired) I would like to get back into Ham Radio. Do I need to take the Tech exam again? Or If I ...
15
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4answers
45k views

FCC tracking of unlicensed FRS/GMRS transmissions

If a transceiver such as the BaoFeng UV-5R is used to transmit over FRS/GMRS frequencies (unlicensed), it is illegal in the United States due to FCC regulations that state that the power must be <0....
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4answers
1k views

Max legal power with nearly zero BW

I'm developing a type of ground penetrating radar that does not use pulses. It's extremely narrow bandwidth. As narrow as a good crystal can get it. The frequency I'm shooting for initially is ...
12
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4answers
12k views

How To Join Packet Radio BBS

I'm a complete newbie here, and on the Southeast Coast of the USA. I don't even own a ham radio yet. Some preppers and I got to talking about a dystopian time of Internet collapse where shortwave ...
9
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5answers
38k views

On which of these frequencies can I transmit without a license?

I have a Baofeng UV-5RA, and I need to know what frequencies on the "channel mode" (what the lady says when you press the "V/M" button on the radio) don't require a ham license. I am in Philadelphia, ...
2
votes
1answer
401 views

How Are US Call Sign Location ID's Assigned?

If I take my license exam in California, but my residence is in New York, would my call sign still reflect the New York location?
1
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3answers
241 views

TXing on another frequency to provide aid in anothers' emergency

By the FCC rules, if you are in an emergency situation and it's your best chance at survival, you're allowed to TX on any frequency. But what if you're hiking and are monitoring the Search & ...
1
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1answer
208 views

Remote base identification

I have a remote base where stations can log in with DTMF touch pad. Does this remote base transmitter need to send out a CW ID?
1
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2answers
315 views

Scanner radio purchase advice for someone that's nosy but not technological?

If it sounds like a stupid question, it probably is. My mom loves being nosy... When she hears the police siren, an ambulance, firefighters, or something like that, she's the first one to run to the ...
5
votes
1answer
466 views

How can I know whether a radio is FCC approved?

I'm considering buying a new HT radio (Hong Ying HX-860UV Handheld) from China. The company says the model is approved by the FCC. Since I can't see it in person (only a photograph), I can't confirm....
5
votes
2answers
218 views

Amateur Radio for a Nomad [duplicate]

I got my amateur license back in the early '80s, primarily for putting it on my resume for an electronics job. Never used it outside of developing my Morse code speed, and once I got my Advanced Class ...
11
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5answers
1k views

What is the highest US amateur license I can get in one sitting?

If I start with no current license, can I take all the exams in one sitting to get to Amateur Extra?
3
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3answers
6k views

How do I find expiration date of my misplaced US ham license?

I can't find my general class license. I want to apply for a vanity call sign (my call sign when I was 16 years old) but I don't know the expiration date of my current license. Is there some way to ...
0
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2answers
188 views

Should a MacBook emit fluctuating EMF when WIFI and Bluetooth are turned off?

I have a couple of MacBooks. Using a Trifield EMF meter with radio/microwave capability, if I hold the meter near the laptop (where I understand the wifi antenna is located), I receive blips ranging ...
4
votes
1answer
986 views

Why is 900MHz restricted in some areas in the US?

So I found these rules: (2) No amateur station shall transmit from those portions of Texas and New Mexico that are bounded by latitudes 31°41 ′ and 34°30 ...
2
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1answer
4k views

Frequencies as 5 digits and 6 or 7 digits

Why are some frequencies 5 digits like 51344 and some six or seven digits long like 158.7600?
2
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1answer
191 views

model rocket locater

I'm trying to determine the best way to operate a model rocket tracking beacon. There's various vague details on modes of operating in part 97, and equally vague descriptions in the 70cm band plan, ...
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2answers
248 views

EMT radio communications

I just joined the community, and I got a communication question. Based on searches most relevant questions were posted in this community, so I hope I can get a proper answer! EMT, first responders, ...
3
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2answers
158 views

Renewing, how do I transmit legally with the new certification process (USA)?

So, from what I hear, the FCC has done away with mailing out paper certificates. The way I read the regs, I'm required to have an official paper certificate either on my person or at the station I'm ...
3
votes
2answers
697 views

What is the proper way to log participation in a net?

I'm a new operator (since Thursday) and I'm just curious how folks here log participation in a net. There is a twice a day social net here I've been participating in occasionally. Do I log everyone ...
4
votes
1answer
2k views

What is my VE status?

I was an ARRL VE years ago. The info about ARRL VEs says that you remain a VE and the only way one will be dropped is loss of license. However, years ago to be a valid VE one would have to have a ...
6
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1answer
184 views

What is Part 97 a part of?

The regulations that govern Amateur Radio in the United States are often described as Part 97. What statute are they a part of? Where can I find other parts of the same law?
4
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1answer
188 views

Best way for US ham to join RSGB

Overseas hams can join RSGB from their site for 51 GBP, which today is about 79 USD. USA hams can also join through the ARRL for 75 USD. Assuming the $4 is not a factor, are there any advantages to ...
2
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2answers
333 views

What restrictions exist for non-HAMs in the 5.8 GHz band?

What restrictions exist for non-HAMs in the 5.8 GHz band in the USA? Context: these types of popular video transmitters (600 mW, 25 mW) commonly used for FPV piloting. Any requirements to have a HAM ...
5
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1answer
667 views

What are the rules for proper use of the 5.8G (5cm) band?

I see several products that operate in the 5.8 GHz range that specifically mention a Ham license is required for their use. For example, the page for this video transmitter specifically mentions ...
6
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5answers
5k views

Is the National Calling Frequency actually used?

I know that the national calling frequency is 146.520. Everywhere I go, it does not give a DUP or TSQ. I am not trying to be or, ask a crazy question but is there or not.
4
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2answers
5k views

What's the unlicensed power limit for 5.8 GHz (5 cm) transmissions?

5.8 GHz NTSC video transmitters are popular for FPV (first person view) model aircraft flying. However, because the 5.8 GHz band (5725 to 5875 MHz) is also available for ISM (unlicensed) use, it's not ...
10
votes
3answers
992 views

Are hashes (such as md5) legal in the US

If I were to implement a remote computer control system using amateur radio, would using hashes (such as md5, sha-*, etc...) for authentication be permissible under the United States rules?
9
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1answer
840 views

Is a modded Yaesu FT-270r acceptable to use on MURS frequencies?

I am a bit new to the radio scene, so excuse me for any ignorance that may follow. I saw on a website that you could mod the Yaesu FT-270r so that you can increase its transmission range outside of ...
6
votes
3answers
415 views

What is the reason/origin of conventional US repeater offsets?

In the US, the common (though not universal) repeater offsets are ±600 kHz in the 2m band and ±5 MHz in the 70cm band. How and why did these offsets come to be standard for amateur repeaters? The ...
1
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3answers
181 views

Using two radios for a faster data rate

The maximum data rate on UHF is 56kbaud. This is well over most "high-speed" 9600 baud transmissions. Is it possible to use two receivers at one site, and two transmitters (vice versa when the ...
12
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3answers
648 views

What are the relative bandwidths of the amateur bands?

While I was operating on 40 m for Field Day, I noticed a higher SWR than when I first set my antenna tuner for the band. This happened, of course, because I was in a different part of the band, but I ...
14
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4answers
664 views

Are amateur radio call signs unique among all radio call signs?

Idle curiosity: Are the call signs of amateur radio operators distinct from call signs in all other radio services, such that there can be no ambiguity even if the relevant license and band(s) of ...
7
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3answers
8k views

Straight to General license, skipping Technician?

I would like to get involved in ham radio and I'm inclined to study for and take the General exam right away, rather than going for Technician and then upgrading. Are there good reasons not to do this?...
5
votes
1answer
386 views

Is it legal (in the US) for a server on APRS-IS to relay replies from non-HAMS to a HAM?

I've heard two sides to this. On one hand, sites that allow you to send messages into the APRS-IS network, for relay over RF, demand you enter a call, as "only licensed HAMs may cause a message to be ...
2
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3answers
13k views

Trouble communicating between Baofeng and Midland walkies

I'm very new to walkies and radios, and I know next to nothing. My friends and I bought a box of Baofeng 888s radios (which apparently also go by quite a few other names and manufacturers) and I'm ...
6
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2answers
1k views

Is it possible to transfer an area-specific call sign from a deceased relative?

I passed my Technician exam today and my grandma, who's been a ham for decades, suggested that I could try to get my grandpa's call sign. He passed away several years ago, but his FCC registration is ...
6
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2answers
1k views

Is it legal to monitor police and weather channels without a license?

I have two HT's that I bought from Baofeng for emergency use and I don't have a license. I was wondering: is it perfectly legal in the USA for me to be monitoring police and weather channels without a ...
2
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1answer
272 views

What FCC rule allows Skywarn and other spotters to restrict repeater use?

When amateur radio operators associated with the national weather service "close the net" on a repeater and request only severe weather reports on that frequency, what FCC ruling is in effect, given ...
11
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6answers
2k views

While backpacking, is it worth mounting the antenna to the backpack frame (above my head)?

I am planning a trip with a large group in 6 weeks. We will be spread out in small groups on a trail in a mostly desert plateau landscape perhaps 5 miles apart, but mostly in a straight line. I'm new ...
3
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2answers
32k views

Can a Baofeng UV-5R+ be used on FRS, GMRS, and MURS?

Is this secure if I was talking to another Baofeng UV-5R+?