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 Post subject: 102.4 MHZ PLL FM TX Schematic
PostPosted: Jun Thu 21, 2018 10:25 pm 
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Joined: Mar Thu 01, 2018 1:30 am
Posts: 29
102.4 MHz PLL FM transmitter. I tested this design 3 years back. The varactor diode can be replaced with a 16V zener diode. The current through the oscillator is only 5 ma and without an antenna the transmitter should have a range of 20 feet. All the components are easily available on eBay from China. The use of SAB6456 prescaler chip greatly simplifies the design. Audio quality is excellent due to the long loop filter constant. Bandwidth extends from 10 Hz to 75 KHz. A stereo encoder can be added to this TX. Here’s the schematic. https://ibb.co/cNfLuo


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 Post subject: Re: 102.4 MHZ PLL FM TX Schematic
PostPosted: Jun Fri 22, 2018 12:31 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3486
Dare4444 wrote:
102.4 MHz PLL FM transmitter. I tested this design 3 years back. The varactor diode can be replaced with a 16V zener diode. The current through the oscillator is only 5 ma and without an antenna the transmitter should have a range of 20 feet. All the components are easily available on eBay from China. The use of SAB6456 prescaler chip greatly simplifies the design. Audio quality is excellent due to the long loop filter constant. Bandwidth extends from 10 Hz to 75 KHz. A stereo encoder can be added to this TX. Here’s the schematic. https://ibb.co/cNfLuo



Would you please provide the long url? Thanks.


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