Designing a low-power FM radio transmitter

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SUMMARY

The discussion focuses on designing a low-power FM radio transmitter, highlighting essential components such as audio buffering, Colpitts oscillator, decoupling capacitors, frequency amplifiers, and matching circuits. Participants emphasize the importance of understanding modulation deviation and RF gain requirements to determine the necessary audio gain and RF stages. A recommended resource for further study is "Small-Signal RF Amplifier Design" by Christopher Bowick, which provides valuable insights into RF amplifier design.

PREREQUISITES
  • Understanding of audio buffering techniques
  • Familiarity with Colpitts oscillator design
  • Knowledge of RF amplification principles
  • Basic concepts of circuit matching
NEXT STEPS
  • Research modulation deviation requirements for FM transmitters
  • Study RF gain calculations for audio amplification
  • Explore detailed design principles in "Small-Signal RF Amplifier Design" by Christopher Bowick
  • Investigate practical applications of decoupling capacitors in RF circuits
USEFUL FOR

Electronics students, hobbyists in radio design, and engineers interested in low-power FM transmitter development will benefit from this discussion.

zak8000
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hello

i have been given six weeks to design a low-power FM radio transmitter for my project however there are no lectures for this course so i have to do the research on my own. so far from researching on the web. i have found that a simple radio transmitter may consist of a number of stages such as:

audio buffering
colpitts oscillator
decoupling capacitors
frequency amplifiers
matching circuit

i was wondering if anyone here is familiar with radio design and could lead me to a good textbook, website or article where i could gain sufficient knowledge to begin this project
 
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What level in school are you and how sophisticated does your design have to be? Which of the stages you mention are you not comfortable designing? You should be asking yourself questions such as "How much deviation do I need?" and "How many kHz/volt deviation will my modulator provide?" That will tell you how much audio gain you need. Knowing how much power out you need and the RF gain per stage will tell you how many RF stages you need.

I know how ubiquitous the internet is but have you tried your library?

The best book I have seen for some of the things you are asking for is
Small-Signal RF Amplifier Design ... By Christopher Bowick

https://www.amazon.com/s/ref=nb_sb_...+Christopher+Bowick&x=0&y=0&tag=pfamazon01-20
 

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