FSK Demodulation (Matched Filter) output

Hi, All i have some simple questions for HAM Radio/Caller ID FSK
demodulation.
Studying FSK demodulation using matched filter it is known that the output
will be +ve  or -ve for mark and space frequency, i am unable to figure out
that
1. What will be the output of matched filters when neither 1 (1200 Hz)  or
0 (2200 Hz) is transmitted. ? How to know this condition.

2. Will matched filter(non coherent) demodulation technique also detect
coherent (Syncronous) FSK signals successfully?

Thanks	 

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On 5.7.14 01:12, engrmasood2002 wrote:
> Hi, All i have some simple questions for HAM Radio/Caller ID FSK
> demodulation.
> Studying FSK demodulation using matched filter it is known that the output
> will be +ve  or -ve for mark and space frequency, i am unable to figure out
> that
> 1. What will be the output of matched filters when neither 1 (1200 Hz)  or
> 0 (2200 Hz) is transmitted. ? How to know this condition.
>
> 2. Will matched filter(non coherent) demodulation technique also detect
> coherent (Syncronous) FSK signals successfully?
>
> Thanks	


1. Please do not start a new thread with identical contents to
    the old one. It is considered bad netiquette, and it decreases
    your chances to get good responses.

2. The HAM radio RTTY signaling and telephone Caller ID differ:
    the caller ID is better on the frequency and usually on a
    cleaner channel without fading.

3. Have you searched for 'RTTY demodulation'? I got nearly 20000
    hits, and at least the first were pretty good.

-- 

Tauno Voipio, OH2UG