Timeline for Frequency upconversion from 1 to 100 MHz for FM transmitter
Current License: CC BY-SA 4.0
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| Jan 6 at 2:06 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Sep 7, 2023 at 20:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 4, 2023 at 5:35 | answer | added | Waldorf | timeline score: 0 | |
| Aug 4, 2023 at 2:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jan 26, 2023 at 23:00 | answer | added | Eeyn | timeline score: 1 | |
| Jan 25, 2023 at 16:09 | answer | added | Marcus Müller | timeline score: 1 | |
| Jan 25, 2023 at 16:08 | history | edited | Marcus Müller | CC BY-SA 4.0 |
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| Jan 25, 2023 at 16:01 | comment | added | Marcus Müller | chopper mixer at an integer fraction of the target frequency, and filter out all but the desired harmonic :) If your ESP32 can produce a stable 33 MHz or 20 MHz rectangle, you could consider using that, and a simple switch IC plus analog bandpass filtering to achieve your mixing. | |
| Jan 25, 2023 at 16:01 | comment | added | Marcus Müller | @Hamdon ha! You could probably directly program that via I²C to do the FM for you, just the way you probably are reprogramming the timer/PWM unit of your ESP32 ;) But yeah, that'd be significantly more work, and probably much harder on the ESP32 to generate the I²C messages, up to the point where it becomes infeasible. But yeah, as long as you have something that directly produces a \$f_{\text{RF target}} - f_{\text{intermediat}}\$ oscillation, you should be able to directly multiply the two using an SE612/SA612/NE602… ; In such purely digital applications, however, it's not rare to use a | |
| Jan 25, 2023 at 15:48 | comment | added | Hamdon | @MarcusMüller I will be using the Si5351 clock generator for the LO. | |
| Jan 25, 2023 at 13:58 | comment | added | glen_geek | Yes, NE602 (SA612) is OK. Circuits in NXP's data sheet are normally down-converters, but can be adapted to up-convert. | |
| Jan 25, 2023 at 13:57 | comment | added | Marcus Müller | @Andyaka I think they're referring to the built-in FM broadcasting receiver built in to many lower- and midgrade phones, primarily. | |
| Jan 25, 2023 at 10:31 | comment | added | Andy aka | A mobile phone won't receive 100 MHz FM. A transistor radio might. Building a self-oscillating 100 MHz frequency modulated oscillator seems much easier than your proposed method. | |
| Jan 25, 2023 at 9:19 | comment | added | Marcus Müller | When you say you want to mix up your 1 MHz IF to 100 MHz, where do you plan to take the oscillator for that mixing from? Can you make your esp generate that, too? | |
| Jan 25, 2023 at 7:47 | history | edited | ocrdu | CC BY-SA 4.0 |
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| Jan 25, 2023 at 7:30 | history | edited | winny | CC BY-SA 4.0 |
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| Jan 25, 2023 at 7:18 | history | edited | JRE | CC BY-SA 4.0 |
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| S Jan 25, 2023 at 7:10 | review | First questions | |||
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| S Jan 25, 2023 at 7:10 | history | asked | Hamdon | CC BY-SA 4.0 |