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Balun for 436mhz design with 50Ohn impedance.

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Rujul Desai

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Hi all,

I am working on RF design and use CC115l IC for 433Mhz 50 ohm. now i want to get 436Mhz with same IC , so what necessary changes are required? like component value change, or add more components etc.

please give reply as soon as possible.


Thanks
 

davenn

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did you read the datasheet .... always a good place to start ;)

http://pdf1.alldatasheet.com/datasheet-pdf/view/442488/TI1/CC115L.html

be aware that if you move off 433MHz to 436 MHz you are moving to a freq that requires licencing for use
and depending on your activities you may upset a lot of people that may result in legal action against you


Dave
 

FvM

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As a starting point, consider that the balun components used in the reference design have at least 5% tolerance and are at best selected from an E24 (about 10% step) series. So the nominal balun center frequency can't be met better than 10 or 20 MHZ. Means there won't be a problem to use the 434 MHz band balun for a frequency slightly below or above.

Davenn's point of using a legal frequency range applies nervertheless.
 

Rujul Desai

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Hi,
Thanks for reply,

if i use same components value for 433Mhz transmission freq then how can i get 436Mhz transmission freq?
and we need pcb antenna for 436Mhz so please suggest for it.
 

SunnySkyguy

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Hi all,

I am working on RF design and use CC115l IC for 433Mhz 50 ohm. now i want to get 436Mhz with same IC , so what necessary changes are required? like component value change, or add more components etc.

please give reply as soon as possible.


Thanks
No changes are required if you follow the directions.
 

Rujul Desai

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hi,

Can you please suggest that how to calculate balun component value and LC filter component?

Thanks
 

FvM

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Calculation isn't easy, particularly for the balun, the method is basically discussed in a TI application note for the 2.4GHz chips, see the link here: https://www.edaboard.com/thread333609.html

But you don't need to calculate anything, you're fine with the 434 MHz values, as previously explained.
 

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