S swerv New Member Jul 31, 2009 #1 Hi! I'm new here so HEllo.. Here is what I have to do.. I need to make an FM transmitter at 1Mhz using a VCO (4046) with a 240Khz BW with an LF ampli and for the receiver I need a BW of 150Khz with an RF ampli with a PLL for the demodulation. So any help, tips, schematic, links.... would be really appreciated!! thanks! mat Last edited: Jul 31, 2009
Hi! I'm new here so HEllo.. Here is what I have to do.. I need to make an FM transmitter at 1Mhz using a VCO (4046) with a 240Khz BW with an LF ampli and for the receiver I need a BW of 150Khz with an RF ampli with a PLL for the demodulation. So any help, tips, schematic, links.... would be really appreciated!! thanks! mat
blueroomelectronics Well-Known Member Jul 31, 2009 #2 Did you try google? **broken link removed** **broken link removed**
S swerv New Member Jul 31, 2009 #3 Yeah I did... but didnt find anything really appropriate yet! Thanks for the reply! But I dont want to use a crystal.. And it has to be at 1Mhz straight. And the receiver will be at only 3-4meters.
Yeah I did... but didnt find anything really appropriate yet! Thanks for the reply! But I dont want to use a crystal.. And it has to be at 1Mhz straight. And the receiver will be at only 3-4meters.
audioguru Well-Known Member Most Helpful Member Jul 31, 2009 #5 You don't need to use a crystal if you make an RC oscillator instead.
S swerv New Member Jul 31, 2009 #6 hmm ok here is a quick stupid question. I need to replace the function generation by a crystal or a RC oscillator?
hmm ok here is a quick stupid question. I need to replace the function generation by a crystal or a RC oscillator?
marcbarker New Member Jul 31, 2009 #7 This is a nice circuit... with a quaint hartley(?) vco oscillator in it. Someone was asking on another thread "is der a way f mking a FM trns mor stabal?" and this does it quite well. Everything to the left of the varicap is the stabilisation
This is a nice circuit... with a quaint hartley(?) vco oscillator in it. Someone was asking on another thread "is der a way f mking a FM trns mor stabal?" and this does it quite well. Everything to the left of the varicap is the stabilisation