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PICList Thread
'FM receiver using PIC as station scanning'
2000\05\06@091833 by juggernut

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Hi to everyone!

Oppss!...Am I on the list? ping...pong! Okey I'm in the list.

I like to assemble an FM radio with digital tunning. Now i would like to use
PIC 16F84 as auto station scanning instead of  manual scanning.

With this, I would like to us some of the PIC and FM circuits designer that
where i can find a free schematic diagram of a digital tuning FM receiver.

If there is a free FM circuits receiver then i modify it so that the PIC
will be the controllers of the station scanning. I know that the Digital
tunnig is being controlled by PLL(phase lock loop), using the PIC I can
extend its capabilities of a simple FM receiver to more enchancement such as
timer off and remote controlled.

Thanks in advance!

Best regards,
-=jug=-
È---------------------------------------------Ç
È  URL: http://www.geocities.com/juggernutz  Ç
È  Email: spam_OUTjuggernutzTakeThisOuTspamyahoo.com                    Ç
È        .....juggernutKILLspamspam@spam@crosswinds.net                    Ç
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2000\05\06@120319 by Brian Aase

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I did such a project a couple of years ago.  Too bad I can't
send the schematic,  it belongs to a former employer.
I used a chip set from Sanyo (three IC's -- PLL, receiver,
and stereo demodulator).  The PLL is very easy to control.
We had a Sanyo CD-ROM with all the data sheets and app
notes.  You might want to contact the Sanyo rep in your
area and see if you can get one.  It would have all the
info you need.

Philips makes a number of one-chip FM receiver IC's.
Likewise their CD-ROM has all the app notes.

The toughest problem I ran into was finding the magnetics
(mostly for the AM section).  If you're doing FM only, your job
will be a lot easier.

Brian Aase

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2000\05\06@122648 by Milan Pavlica (YU7AEC)

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Hi!
Is there any way to build some scanner (eg from 100MHz to 500MHz) with PIC
which can be interfaced with those Philips TSAxxxx or simmilar IC?? - I2C
bus
I would like also to build some radio amateur receiver (and tranceiver)
which can listen "above" amateur frequencies...

Brian Aase wrote:

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2000\05\07@071646 by Tom Bratton

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If you visit http://www.rig.org.uk/index.html you will find PIC 16C84  or 16F84
source code for controlling the  PhilipsTSA6057 or TSA 6060 PLL frequency
synthesiser chips.

 Look  under 'Software' for RX2 DIY.ZIP     (NOT the remote control software).

These chips work from 30 -200 MHz.

Tom

2000\05\08@113624 by Quitt, Walter

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Can you limit the bandwidth of those chips?
You can't with the chips used on those ISA
PC card FM receivers.  That makes listening
to narrow band FM basically impossible
least in San Diego, CA USA.  That's because
we have soooooo much FM communications
going on.  My little ICOM IC-Q7 does an
OK job, though.  I don't think  a hobbyist
can pack as much guts into as small a package
as that is.

GL OM DE WA6FEC

{Original Message removed}

2000\05\09@032040 by Milan Pavlica (YU7AEC)

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I need something like a wide band receiver...
Like scanner...

"Quitt, Walter" wrote:

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> {Original Message removed}

2000\05\09@123818 by Quitt, Walter

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If the spacing you want is like FM broadcast, you're fine.
But, if you want to receive commercial wideband (data?) FM,
I think you may be in for a surprise.  If there are not
too many signals nearby then you can get narrow band FM,
just not very loud.  Been there with those little chips.

GL,
Walt...WA6FEC

{Original Message removed}

2000\05\09@135518 by Milan Pavlica (YU7AEC)

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Cops are there on 400MHz here and some other on 150-170mhz
I want sometims to hear some action..:))

"Quitt, Walter" wrote:

> If the spacing you want is like FM broadcast, you're fine.
> But, if you want to receive commercial wideband (data?) FM,
> I think you may be in for a surprise.š If there are not
> too many signals nearby then you can get narrow band FM,
> just not very loud.š Been there with those little chips.
>
> GL,
> Walt...WA6FEC
>
> {Original Message removed}

2000\05\09@142824 by Quitt, Walter

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Those are most likely narrow band FM.
If they are on multiple "channels" (frequencies)
you will hear a LOT sorta.  It will depend
on which signal is the strongest within the
pass band of the receiver.  Recall that it
only takes a signal 3db stronger to "capture"
an FM channel.  So if your center frequency
is A +/-30KC and is at strength X  and a signal
15KC away comes in at X+3db the receiver will
be pulled to that signal.  Narrow band FM is
+/-5KC (good for voice) so you will hear that
new signal.

Have fun,
Walt...

{Original Message removed}

2000\05\09@150004 by Andrew Kunz

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How narrow a band do you need?  Why not use the Mot chip that is so common in
radio-control model receivers?

Andy

2000\05\09@161749 by Milan Pavlica (YU7AEC)

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Hi!
Well, i ned receiver from 100-500MHz..
I cant find mot chips here...
TSA5511 (if i have good memory) is very nice and it can be controled with PIC via
I2C bus..
But, if somebody have something simillar and a chip then it would be nice..

Andrew Kunz wrote:

> How narrow a band do you need?š Why not use the Mot chip that is so common in
> radio-control model receivers?
>
> Andy

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