DW1000 Radio IC

My name is Yuki Maeda and I am writing you from Japan.
I have a question regarding item DW1000 Radio IC that I found on your webpage.
Can we use this product in Japan?

I look forward to hearing from you soon.
Yours sincerely,

DW1000 Radio IC can be used in Japan for R&D only as UWB product with DW1000 can not be certified for Japan standard.
We are however working on a new transceiver which will support a higher channel frequency to address Japan.
So it is possible to research and evaluate the technology in the Lab.
/Leo

Sir, can you tell me how to calculate range (link budget) to find out -5dB gain antenna is okey for 50 Meter communication on band 5??? please reply urgently…