Hi guys,
I need to try and build a tunable AM receiver for a project I'm doing. Ideally I want it to span from about 30MHz to 150MHz. I'd also like it to be digitally tunable. I read some article about how to do it with an old tuner module from a VCR, but can't seem to find the relevant chip anywhere to buy. Is it still possible to buy such a chip, and if so, what sort of bandwidth can those babys receive?
Best Wishes,
Tom
Whatever you want.
The tv tuner module tunes the incoming signal down to a fixed frequency. After that, it's up to you to cook up an IF strip to limit the bandwidth to whatever you want, amplify the signal, and then detect it.
Michael
You can *almost* do it with a VCR tuner. Since TV tuners normally tune the TV broadcast band on the low end, and that low end is at 50 MHz, it's doubtful that you could get one to tune down to 30 MHz. Perhaps by experimenting with the varactor diode inside the tuner, or installing a small amount of capacitance across it, you could force it to tune down to 30 MHz.
The chip you're thinking about is probably a PLL (phase locked loop) IC, made by several companies. ON Semiconductor, Toshiba, Sony, etc., are good sources to start with. Go to their web sites and search for PLL or phase locked loop.
Cheers!!!
-- Dave M MasonDG44 at comcast dot net (Just subsitute the appropriate characters in the address) Never take a laxative and a sleeping pill at the same time!!
Here, I found these that might help.
These links will take you to a couple that I found.
Good luck on your project. You might pick up the 108 - 117.995 and 118 - 136 MHz aircraft
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.