Is frequency multipliers suitable for boradband FSK?

there are many applications use frequency multipliers to improve the
deviation of narrowband FSK . i wonder is it suitable for boradband FSK?
For example,the input signal should be 4FSK,and the frequencys is
67MHz/69MHz/71MHz/73MHz,the symbol rate is 10M .

On Jun 8, 4:26 pm, "isgone" <isg...@hotmail.com> wrote:
> there are many applications use frequency multipliers to improve the
> deviation of narrowband FSK . i wonder is it suitable for boradband FSK?
> For example,the input signal should be 4FSK,and the frequencys is
> 67MHz/69MHz/71MHz/73MHz,the symbol rate is 10M .


The modulation can be called "broadband FSK" only if h >> 1. That is
not
the case for your system, since the bandwidth of the modulating signal
is larger than twice the deviation.

John

>The modulation can be called "broadband FSK" only if h >> 1. That is
>not
>the case for your system, since the bandwidth of the modulating signal
>is larger than twice the deviation.
>
>John
>
>
so it is a narrowband system ? but the bandwidth of the modulating signal
is so large that it is hard to process .
if i want a system which the input signal is 67MHz/69MHz/71MHz/73MHz 4FSK
,and the output signal is 335MHz/345MHz/355MHz/365MHz 4FSK , the symbol
rate is aways 10M . is a x5 frequency multiplier suitable?
because the symbol rate is high ,the frequencys change too fast , i afraid
the frequency multiplier can't work .