Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [transmission]

The tag has no usage guidance.

7
votes
3answers
1k views

Is it legal to transmit with HackRF one?

Is it legal to transmit using HackRF one (in Germany), the purpose is to do some Lab research and Academic experiments. for example i want to broadcast an FM signal using HackRF one and try to ...
0
votes
1answer
28 views

Can timing information be used to compress data for LoRa transmission?

I have a course challenge. It involves calculating an FFT of an audio signal of 2 combined frequencies (up to 20KHz) then sending it over LoRa through to a fixed receiver. There will be an interferer. ...
2
votes
1answer
67 views

Range of wireless signals

I've put up this question already on physics.SE but I miss an answer to the following: My assumption: A 5 GHz band provides a higher bandwidth and therefore is more stable as it can support more ...
1
vote
1answer
56 views

Do phones transmit RF when they’re not in a call?

I apologize in advance if this isn’t the right place to post this, but I though some of you might know the answer to my question. Many people say that having your phone in your pocket (while not in ...
1
vote
5answers
1k views

Can we transfer digital files on radio spectrum?

Radio is analog, and a modem converts analog signals to digital signals and vice versa. So is P2P sharing of digital files (like .exe, .7z, .pdf or any other file) possible using radio spectrum? ...
1
vote
1answer
243 views

Using Baofeng BF888s with Midland GXT1000

We're trying to ease over to Baofengs where I work, go over to MURS, and I've been trying to get the BF888s to work with the GXT1000s but all I've got is the Midland RECEIVES from the Baofeng, but it ...
1
vote
1answer
2k views

Transmit on multiple frequencies with USRP using GRC

I am using an Ettus Research B200 with GNU Radio Companion (GRC) and I would like to transmit two signals at two different frequencies simultaneously. As a simple example, I would like to transmit a ...
0
votes
1answer
56 views

Power Density Function

A radio receiver needs $1 \textrm{ nW}/\textrm{m}^2$ of power density function, how far away from a 1-watt point source will it continue to work?
2
votes
0answers
283 views

How did recording ZX Spectrum games from radio work? [closed]

I have recently heard about recording video games' binary codes from radio programmes which was quite popular several decades ago. The computer name was ZX Spectrum. The general idea behind the ...
7
votes
2answers
993 views

Broadcasting a WiFi SSID long-distance

Which equipment would be good for broadcasting a WiFi SSID the longest possible range? We're making an orienteering race in a forest and would place a sender somewhere high over the trees, ...
2
votes
1answer
2k views

Baofeng UV-B6 transmits no audio

I have this Baofeng UV-B6 (the same as B5), and after using CHIRP a few times, transmission stopped working. In fact, it starts transmitting, but no voice is sent whatsoever — dead carrier. RX works ...
5
votes
3answers
659 views

Why are Amateur Radio operators so obsessed about and hostile towards violation of the rules? [closed]

Please don't downvote just for the title, I'm not trolling, and honestly looking for an answer. I'm not directly involved with Amateur Radio, but have friends who are. They're always by the book. The ...
6
votes
3answers
371 views

What is the permissible frequency error for US amateur radio transmissions?

What are my requirements as a licensed Amateur Radio operator in the US to keep to a single frequency? How much drift can I have during transmission and still be within my license? Does it depend on ...
10
votes
4answers
181 views

How do I increase my phone intelligibility?

Listening to various operators at different times, I've sometimes noticed, especially during contests, that some operators are easier to understand than others, and it doesn't all seem to be due to ...
9
votes
3answers
312 views

What is the best practice when tuning an antenna on air?

I have a magnetic loop antenna that takes a long time to tune and of course, while tuning it, I need to be transmitting. What is the best procedure for tuning on air? I understand I need to check ...
6
votes
1answer
182 views

Why do some antennas list modulation type alongside power rating?

Looking at HF antennas I've noticed that occasionally I'll see power ratings similar to "200W (SSB)". Why would the modulation matter for an antenna's power output rating, and in the absence of other ...
9
votes
3answers
302 views

Does modulation affect propagation?

Does the modulation scheme, whether OOK, SSB, AM, FM, a digital mode, etc, affect the propagation of a signal?
5
votes
1answer
193 views

Can I modify my radio to transmit on frequencies that I can currently only listen to? [closed]

I bought a radio that can receive 4 ham bands, but only transmit on 2. Can I modify my radio to transmit on these frequencies legally?