Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [transmission]

31 questions
11
votes
4 answers

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 their speech patterns. The audio doesn't sound good…
Adam Davis
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3 answers

Does modulation affect propagation?

Does the modulation scheme, whether OOK, SSB, AM, FM, a digital mode, etc, affect the propagation of a signal?
Adam Davis
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3 answers

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 the frequency and identify myself before…
David VK2VXK
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9
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3 answers

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 receive it using another hardware (RTL-SDR). If no is…
A.SDR
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8
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3 answers

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 the mode or band? Note that I'm not asking about…
Adam Davis
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7
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3 answers

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, transmitting a WiFi signal into the forest. The SSID should…
sune
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1 answer

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 information how does one properly derate such an…
Adam Davis
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3 answers

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

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 book is right. period. With amateur radio, if you…
user1882
5
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1 answer

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

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?
Timtech
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How do businesses develop and test amateur radio products in the US if you cannot be paid for amateur radio use?

Certainly there are companies in the US (like Kenwood) that develop HAM products that transmit. For development and QA they would likely need to test the product outside of a Faraday cage. How can companies test those products in the HAM bands if…
KJ7LNW
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1 answer

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 sine wave at 915 mhz and another at 916 mhz, both…
Shrout1
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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 battery-powered radio to contact the police in an…
hopefulhacker-Reinstate Monica
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6 answers

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? If yes then which tools do I need to do this? Does…
GypsyCosmonaut
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How did recording ZX Spectrum games from radio work?

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 process was that you had to turn on recording when…
Mateusz Piotrowski
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1 answer

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 without any issues. I tried with restoring default…
YT5ZEC
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