Please recommend a cheap RF transmitter with variable frequency of 415M~475M and price <10 yuan

wonderfulfly

Please recommend a cheap RF transmitter with variable frequency of 415M~475M and price <10 yuan [Copy link]

 

Used as a frequency scanning source, with no limit on transmission power, and other requirements are as stated in the title.

Thanks!

chunyang

It depends on the accuracy and step value you require. If you have higher requirements, you can use PLL frequency synthesizer chips, but the price is not enough. If you use digital communication chips, some models of Silicon's si44xx can cover the frequency band you require, but these communication chips cannot continuously sweep the frequency output, and I don't know what impact the baseband signal will have on your application. If you want to continuously sweep the frequency output of a sine wave, only frequency synthesizer chips can achieve this.

btty038

Price < 10 yuan

btty038

btty038

The intercom frequency band is completely covered. Go inside and take a look.

btty038

wonderfulfly

chunyang posted on 2022-10-8 18:40 It depends on the accuracy and step value you require. If you require higher accuracy, you can use PLL frequency synthesizer chips, but the price is not enough. If you use digital communication chips, silicon ...

Thank you. I am considering using a wireless data transmission chip, such as TI's CC115L, which only transmits carrier waves but not data. Is that not possible? Frequency synthesizers are expensive, and there are few integrated single-chip ones.

wonderfulfly

btty038 posted on 2022-10-8 20:02

Thanks. MAX seems to be good. I will take a look.

chunyang

wonderfulfly posted on 2022-10-10 14:34 Thank you. I am considering using a wireless data transmission chip, such as TI's CC115L, which only transmits carrier waves but not data. Is that not possible? The price of frequency synthesizers is expensive, ...

Whether it is possible to send only the carrier wave, this must be confirmed by checking the device manual. As far as I can remember, FSK-type wireless communication chips do not seem to work, and only low-end ASK/OOK-type chips support it. However, the frequency coverage of such chips may not be sufficient, and it is generally probably in the 433MHz range, with a maximum of around 450MHz. It may be feasible after overclocking the local oscillator, but it needs to be verified experimentally.

chunyang

In fact, it is better to use ready-made instruments, such as signal generators, sweep frequency analyzers, or even spectrum analyzers with tracking signal sources.

wonderfulfly

chunyang posted on 2022-10-10 14:47 In fact, it is better to use ready-made instruments, such as signal generators, sweep frequency analyzers, or even spectrum analyzers with tracking signal sources.

It is used in electronic products and is cost-sensitive.

btty038

wonderfulfly posted on 2022-10-10 14:35 Thanks. MAX seems pretty good. I'll take a look.

You're welcome. Let's learn and discuss together.