• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

FM Transmiter

Status
Not open for further replies.

angelkal

New Member
Hi to all. I want to ask if is it possible to create an FM transmiter that transmits 100MHz freq precisely and only 100Mhz. Thank you.
 

alec_t

Well-Known Member
Most Helpful Member
Welcome to ETO.
How precise do you mean? A frequency with an error of 1% would be easy, an error of 0.01% more difficult, etc. However, since 100MHz is in the FM band your transmitter would be illegal in many jurisdictions.
 

audioguru

Well-Known Member
Most Helpful Member
An accurate frequency is made with a quartz crystal oscillator and the transmitter uses one of its harmonics.
 

Dick Cappels

Active Member
Audioguru's idea in post #3 is probably the most direct method. You might do well to read this article and use a 20 MHz, 25 MHz, or 33.3333 MHz crystal in the oscillator. Of course all of the tuned circuits would have to be adjusted for the crystal frequency and transmit frequency.

www.arrl.org/files/file/Technology/tis/info/pdf/8505023.pdf

By the way, even though if modulated the frequency would not be purely and precisely 100 MHz, it would on average be precisely 100 MHz -does that count? :)

(Edited to add link to pdf file)
 
Last edited:
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top