| Author |
Message |
Thomas Kay
Guest
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 Posted:
Mon Feb 07, 2005 8:40 am Post subject:
Tunable AM receiver |
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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
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Michael Black
Guest
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| Posted:
Mon Feb 07, 2005 8:40 am Post subject:
Re: Tunable AM receiver |
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Thomas Kay (thomas.kay@gmail.com) writes:
| Quote: | 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 |
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DaveM
Guest
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| Posted:
Tue Feb 08, 2005 8:40 am Post subject:
Re: Tunable AM receiver |
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"Thomas Kay" <thomas.kay@gmail.com> wrote in message
news:3633feaa.0502061849.cce0d3a@posting.google.com...
| Quote: | 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
|
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!!
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sean
Guest
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| Posted:
Wed Feb 09, 2005 3:58 am Post subject:
Re: Tunable AM receiver |
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Here, I found these that might help.
http://products.sel.sony.com/semi/mixedsig.html
(There's one that does 10 - 160 MHz) it's the CXA3106AQ.
The data sheet is in pdf format. download it and save it.
http://www.toshiba.com/taec/cgi-bin/master_search.cgi
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
"Thomas Kay" <thomas.kay@gmail.com> wrote in message
news:3633feaa.0502061849.cce0d3a@posting.google.com...
| Quote: | 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 |
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