About FSK Frequency ?

Is it better to transmit FSK signal wireless at low frequency or at high frequency (which better 10.7 MHZ or 90 MHZ) ?

There is no theoretical difference. You will have to decide based on other factors such as hardware cost.

Ok, the Hardware cost now isn't factor to me in the mean time , So i mean with respect to the transmission & signal performance , Which is better raising or lowernig the freq. ?

There is also the legal limits. In many countries 90 MHz is in the broadcast band and you are not allowed to transmit there. This leaves you with 10.7 and its large antenna size disadvantage.

Thanks , But how long & type will be the antenna in case of 10.7 MHZ , i'm aimming for just 100 meter coverage area ?

It all depends on the equipment. You will probably have to use antennas a few meters long at each end.

Hi, Nonsence. If you want to have a range of 100 meters 10.7 MHz is OK and simply use a one transistor oscillator with a small wire of 5 - 10 inch and you will be OK. It is more depending on your receivers sensitivity.

regards,

Paul.

PS: An optimum match you will not make anyway.

I'm afraid i don't understand this part ,

Thanks

What I want to say is that the best antenna at 10 Mhz is about 15 meters long (7.5 in either direction).. Make sure your receiver is sensitive. I one time also made an FM transmitter at 10.7 Mhz and it was working through university buiilding .

Paul.

hi....one guy here is right ...u keeping all the other factors constant....u should be careless about the frequancy....