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Need a shematic of FSK Modem!

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digitalheart

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Hi!
I want to design a low speed FSK Modem, but I have some troubles in filter designning for received FSK signal . Does anyone have any idea about this? Should i use what type of filter.
And... if anyone has a shematic of this type Modem, pls share them with me. It's useful for me.

Best Regard!
 

Use a PLL. There are dedicated PLL chips for low frequency FSK modem applications. An example is the XR2211 from EXAR. Any type of PLL can be used.
 

xr 2206 is a modulator that can be used. i have
the full schematic for 30k and 60k mark space freqs.
at 1200 baud. u can contact if u still need em.
regards.
 

you can use also CML fx604 or fx614
 

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