antenna impedance matching

[Junaid Alam]

please helpn this guy :"i am implementing an fsk circuit that has an output impedanceof 600 ohm and the problrm i am facing is how to couple this to the antenna.what should be impedance circuit and antenna specifications.

the data is digital and operating b/w 200khz and 300khz.

the transmitter is xr2206 and receiver is xr2211.
i have successfully implented it through wired connection
i hopeto come up with some suggestion from ur side.

my email id is
engr-kamranmalik@hotmail.com "

 

[cwt]

Hi Junaid,

Does your output from the xr2211 have a 50% duty cycle?

My xr2211 output is not quite stable as the duty cycle might varies. Sometime has greater duty cycle, sometime has smaller duty cycle. But on average it is around the region of 39% duty cycle.

Can you advise me?

Regards,
cwt

 

[Borber]

Practically it is not possible to use your signal (200-300kHz) for wireless communication. You must use modulated HF carrier.

 

[Abu Ammora]

You have to convert up your freq. , you need a carrier freq. and let the Data BW round that carrier , Try to use Mixer.

 

[louisnells]

You have use a high frequency signal.

Also try a transformer for impedance matching.