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I want to design a fm receiver circuit for the frequency range of 144-146Mhz.Kindly suggest me a suitable ic for the same.
Design FM Receiver Circuit | 144-146Mhz Frequency Range
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Discussion Overview
The discussion focuses on designing an FM receiver circuit specifically for the frequency range of 144-146 MHz. Participants explore suitable integrated circuits (ICs) and the complexities involved in achieving the desired receiver performance, particularly for narrow band FM (NBFM) and Morse code decoding.
Discussion Character
- Technical explanation
- Debate/contested
- Experimental/applied
Main Points Raised
- One participant seeks recommendations for an IC suitable for an FM receiver in the 144-146 MHz range.
- Another participant questions the performance requirements for the receiver and offers their experience in the area.
- A participant notes that standard 10.7 MHz intermediate frequency (IF) is not suitable for NBFM at 144 MHz, suggesting that double conversion is necessary, along with specific oscillator frequencies.
- It is mentioned that a circuit based on the MC3359 chip could be used, but it requires additional components like narrow filters and a stable oscillator.
- One participant expresses the need to decode Morse code transmitted in this frequency range and questions the feasibility of using a mixer to lower the frequency for compatibility with the TDA 7000 IC, which does not meet the frequency criteria.
- Another participant suggests the SA605 as an alternative to the MC3359, highlighting its integrated features such as a low-noise amplifier (LNA), oscillator, mixer, and FM demodulator.
Areas of Agreement / Disagreement
Participants express differing views on the appropriate ICs and methods for achieving the desired receiver functionality. There is no consensus on a single solution, and multiple approaches are discussed.
Contextual Notes
Participants mention specific frequency ranges and performance requirements that may limit the applicability of certain ICs. The discussion includes considerations about the complexity and cost of the receiver design.
Who May Find This Useful
Individuals interested in FM receiver design, particularly for amateur radio applications, Morse code decoding, and those exploring narrow band FM technologies.