frequency 315 434 distance
i am new to wireless devices,
My first objective is to fix the frequency of operation, because based on that all chip selection and other parameters are dependent.
Application:My wireless devices will be inside office/home,(concreet obstacles are sure to present) and it is battery operated, distance aroud 500Feets.
Any guidelines on the selection of frequency for wireless devices?
Thanks
Babesh.
434 or 315 MHz.
Where do you work? I mean which country
The frequency depends on lot many parameter, first is of course distance . Now if u have lotz of concrete , use lower than 1GHz. Depending on whether u want to pay license or not , u can select 433Mhz,915Mhz band.
Normally, as u increase the frequency , u penetrate less and doesn't go far with given power.
Well I have not seen people using 915MHz for 500 ft.
May be people using it.
But use 433.92MHz it will be useful in Europe, Asia.
Hi Folks,
thanks for your reply,
Actually i have to justify on the reasons for selecting particular frequency,
Now i understand that 2.4Ghz may not be suitable because of its less penetration thru walls and distance..
I was biased by TI site mentioning about the 2.4Ghz chipsets.
Can i get any furher standard reference document which can explain the frequenct selection criteria.
Thanks Dipnirvana& Abhi for your reply.
thnx
Babesh.
http://wireless.ictp.it/school_2006/...sics-ebook.pdf
I don't think that with 2.4Ghz it's impossible. U have to use power amplifier that will be problem if ur product is battery powered. But 2.4GHz iss free to use almost every where in the world