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12MHz reference frequency in PLL

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12MHz reference frequency in PLL Empty Re: 12MHz reference frequency in PLL

Post by Ivan Mon Feb 14, 2022 7:09 pm

dare4444 wrote:Someone asked me for a transmitter design in 42-50 MHz early FM band.
There are NBFM channels in the 6M ham band (50 - 54 MHz).

VBR Ivan

Ivan

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12MHz reference frequency in PLL Empty Re: 12MHz reference frequency in PLL

Post by dare4444 Mon Feb 14, 2022 7:36 am

Ivan wrote:Hi, where is the AF injected?

VBR from Ivan

Not shown, to the Varactor diode via 56k.
Someone asked me for a transmitter design in 42-50 MHz early FM band. I have tested the 74hc00 as PLL but it was at 750KHz. 12MHz is quite high, lol

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Post by Ivan Mon Feb 14, 2022 7:05 am

Hi, where is the AF injected?

VBR from Ivan

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Post by dare4444 Sun Feb 13, 2022 11:37 pm

For 48MHz antique FM radio. 
Add one more 74F74 for 96MHz operation. 12MHz reference frequency in PLL Img_2165

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