pll fm tx

时间：04-08 整理：3721RD 点击：

Hi,

I am actually searching for a nice FM Tx using which I can transmit FSK/ASK WITHOUT worrying about freq. instability over a period of atleast 1 - 2 hours of continuous usage.

Would like to sending pure FM and never use carriers above 100Mhz.

I have no problems using, say, a 40kHz carrier, but stability of the frequency is the MAIN criterion.

I chose 40Khz as an example, because this freq. can be had for cheap using normal CMOS digital gates and a XTAL or even a standalone microcontroller.

What do you guys think about a simple 565 PLL based FM Tx for such low freq (40Khz to say 300Khz range)?

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