Questions tagged [transmitter]

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2
votes
2answers
109 views

What does radiation power mean?

I would like to ask you what it means when it is written that a transmitter has 10 dBm power. Does that mean that 10 dBm is provided to the antenna, or that 10 dBm is measured at particular frequency ...
1
vote
2answers
237 views

How difficult is it to build a basic transmitter and receiver

Preferably something that could transmit LED lights, like patterns. After that I'd like to advance to audio and video. But for the basic radio transmitting and receiving how difficult of a job would ...
1
vote
1answer
131 views

International Broadcast - database programs? [closed]

In my search to identify the stations I can (barely) hear on my small shortwave setup, I discovered the HFCC. They have a tool that takes your location and UTC time, and provides a list of stations ...
3
votes
1answer
267 views

SSB modulation image rejection

I'm trying to figure out how SSB transmitters manage to get rid of the images created when mixing up audio frequencies. For example, when mixing a 1KHz signal with a 7MHz one you will end up with two ...
3
votes
1answer
2k views

Jamming with USB SDR

Could an attacker use a simple USB SDR dongle, as long as it is capable of transmitting within a certain range, to jam frequencies? I saw Lady Ada build the WaveBubble which is basically a dual-band, ...
3
votes
1answer
566 views

Audio Morse Code to CW converter?

What kind of circuit can be constructed and/or could be used to convert audio containing Morse Code sounds (say from an old practice tape, or from computer generated audio) into key, switch or relay ...
2
votes
2answers
997 views

What is a “dip relay” and how does one use it to build a transmitter?

Reading a discussion on low parts count transmitters, I came across this description, which lacked schematics and build instructions: Re: PROJECT 14: THE WORLD'S SMALLEST TRANSMITTER Are y'all ...
6
votes
2answers
2k views

Preventing CW key clicks

What are "key clicks"? How much does the rise time or bandwidth of a CW signal need to be limited to prevent other QSOs on adjacent frequencies from being annoyed by "key clicks"? Is there a legal ...
-3
votes
1answer
164 views

How do I radio? [closed]

What's the simplest way to make a radio station from my home? I just want to bump this city with some slick tunes. What do I need to buy and about how much am I to spend?