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PICList Thread
'FSK Modem'
1999\08\29@060312 by Justin Grimm

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Hi all
Has anyone made the fsk modem by Rildo Pragana?
Im thinking of constructing it but am unclear on a few points.
1.
C9, C11, C13, C14, C15 and R8's values are unclear. Does
anyone know what they should be?
2.
Transformer T1's size or value is unclear.
3.
Will the modem work on Australian phone network?

Can anyone fill in the blanks?
Thanks
Justin

1999\08\29@060519 by Justin Grimm

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Hi all
Has anyone made the fsk modem by Rildo Pragana?
Im thinking of constructing it but am unclear on a few points.
1.
C9, C11, C13, C14, C15 and R8's values are unclear. Does
anyone know what they should be?
2.
Transformer T1's size or value is unclear.
3.
Will the modem work on Australian phone network?

Can anyone fill in the blanks?
Thanks
Justin

1999\08\31@053020 by Justin Grimm

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part 0 454 bytes
 Hi all
 Has anyone made the fsk modem by Rildo Pragana?
 Im thinking of constructing it but am unclear on a few points.
 1.
 C9, C11, C13, C14, C15 and R8's values are unclear. Does
 anyone know what they should be?
 2.
 Transformer T1's size or value is unclear.
 3.
 Will the modem work on Australian phone network?

 Can anyone fill in the blanks?
 Thanks
 Justin




Attachment converted: wonderland:fskmodem.gif (GIFf/JVWR) (0000BE3C)

1999\08\31@085459 by Russell Jonathan

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This Modem sounds interesting. It would be nice to get it working in South
Africa as well. I did a quick search on the net for this modem and came up
with this site http://www.qsl.net/~dg1scr/pr/epp/index_e.html, also
interesting.
Do you have a website where you got this .gif.
Thanks

> {Original Message removed}

1999\08\31@091913 by Wagner Lipnharski

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I thought someone would like to see this:

Circuit: http://www.ustr.net/modem/modem.gif
Description: http://www.ustr.net/modem/modemdsc.htm
Software (8051): http://www.ustr.net/modem/modem.asm

I have few RC224ATF chips available if someone is interested.


'FSK Modem'
1999\09\01@060544 by Justin Grimm
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I got the circuit from microchip net resources, I dont think
he has a web page

http://www.geocities.com/SiliconValley/Way/5807/



----- Original Message -----
From: Russell Jonathan <spam_OUTRussellJTakeThisOuTspamFTG.CO.ZA>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Tuesday, 31 August 1999 20:38
Subject: Re: FSK Modem


> This Modem sounds interesting. It would be nice to get it working in South
> Africa as well. I did a quick search on the net for this modem and came up
> with this site http://www.qsl.net/~dg1scr/pr/epp/index_e.html, also
> interesting.
> Do you have a website where you got this .gif.
> Thanks
>
> > {Original Message removed}

1999\09\03@155735 by Markus Rohe

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Hello Justin,

Sorry, I'm a bit late!

Justin Grimm schrieb:
>
>   Hi all
>   Has anyone made the fsk modem by Rildo Pragana?
>   Im thinking of constructing it but am unclear on a few points.
>   1.
>   C9, C11, C13, C14, C15 and R8's values are unclear. Does
>   anyone know what they should be?

A 10kpF means 10 * 1000 pF, 10nF. (If I'm not mistaken) and a 10k
condensator should also have a value of 10nF. R8 has a value of 7500
Ohms (7.5 kOhms)

>   2.
>   Transformer T1's size or value is unclear.

It should be a 1:1 Transformer with 600 Ohms Inpedance. If you have an
old phone left you can use its transformer.

>   3.
>   Will the modem work on Australian phone network?
>
>   Can anyone fill in the blanks?
>   Thanks
>   Justin

I have not built it but it should work on almost every phone system...

Friendly Regards
Markus

1999\09\03@174738 by paulb

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Markus Rohe wrote:

> It should be a 1:1 Transformer with 600 Ohms Inpedance. If you have an
> old phone left you can use its transformer.

 I'd be *extremely* surprised if a telephone design in any country used
a 1:1 transformer (which is the only actual specification.  Transformers
don't actually have impedance specifications in this regard).  Most in
fact use auto-transformers with quite odd ratios.

 Certainly no common phone in this country did.  I think the above
would more correctly read "If you have an old modem left you can use its
transformer."

 Picky perhaps, but you'd be very disappointed searching for modem
transformers in offcast telephones.  Maybe in .DE ...
--
 Cheers,
       Paul B.

1999\09\05@181723 by Dennis Plunkett

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At 21:57 3/09/99 +0200, you wrote:
{Quote hidden}

Do not use the transformer out of an old 800 series telephone, it is not
600R. Buy one off the shelf, the small size is not a problem as nor current
should be flowing thorugh it. As for the line match, better look for a TN12
impedance (Complex) I don't suggest that you build this and connect it to a
phone line


Dennis



{Quote hidden}

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