Questions tagged [transmission]

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Using radio for musical collaboration [duplicate]

I'd like to collaborate (e.g. play together) with other musicians in my local area and/or beyond. Coronavirus has made in-person collaboration difficult. Latency makes internet-based collaboration ...
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1answer
103 views

How does PTT from one two-way radio prevent input on another?

I'm very much a beginner with radio. I have a simple set of Baofeng BF-888S radios, and in my basic use with those, I got very curious about something: when you push the PTT button on one radio to ...
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36 views

R433A SAW Resonator

I have one of those wireless weather sensor things that stopped transmitting. Inside is one of those ubiquitous R433A SAW resonators that transmit on 433.92MHz. I've verified that the board it's on ...
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2answers
81 views

How Duty cycle affects transmission rate in RF module?

I planning to use RF module for communication of high precision GNSS module. So I am doing detail study on RF module. In one of the datasheets of RF module (part no: RFD868ux) mentioned that 'Duty ...
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2answers
2k views

Can a ham radio pickup police signals?

Can you pick up police signals with ham radio? Secondly, are you able to contact emergency services with ham radio. For example: In the middle of a hurricane, with no power, can you technically use a ...
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1answer
2k views

Baofeng UV-5R transmitting to Baofeng BF888s - 888s will not receive transmission unless holding "mon"

so i have just received today a baofeng uv-5r that i had ordered, i already had the 888s after programming the uv-5r to the same frequency as the 888s, i am able to recieve transmission all LEDs ...
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5answers
2k views

Can I contact the International Space Station using my Baofeng UV5R?

I saw this article but I can't imagine the power output, (eight watts max) would be enough to be picked up by the ISS at 200 miles above me. Similarly, I don't know if the preamp on the receiver ...
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86 views

Can I make a simple Tx/Rx antenna (Radio System) which will receive signal from BTS and broadcast/transmit it, and vice versa? [duplicate]

Consider a situation as below. I am stay in a farm field, which my house is 9.4km distance from the nearest and the only one BTS (Base Transceiver System), a cellular antenna for transmit and receive ...
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3answers
907 views

Is it possible to have multiple people talking on the same radio channel at the same time?

I understand that my question is not desireable for ham radio communication at all, but bear with me. I want to use long range walkie talkies whose microphone is attached to an underground acoustic ...
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1answer
134 views

How hard to send files [duplicate]

How hard and expensive would it be to send a file from my house in London to a coastal area in Spain? It would most likely be software I want, so it must transfer perfectly, however if it is feasible ...
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3answers
3k 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 ...
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2answers
94 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. ...
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1answer
78 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 ...
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1answer
67 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 ...
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6answers
4k 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? ...
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1answer
766 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 ...
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1answer
3k 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 ...
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1answer
72 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?
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0answers
365 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 ...
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3answers
2k 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, ...
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1answer
4k 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 ...
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3answers
1k 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 ...
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3answers
464 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 ...
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4answers
359 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 ...
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3answers
897 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 ...
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1answer
311 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 ...
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3answers
436 views

Does modulation affect propagation?

Does the modulation scheme, whether OOK, SSB, AM, FM, a digital mode, etc, affect the propagation of a signal?
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1answer
248 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?