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I have both CC1101 and CC1070, and I want a very low power, short range (less than 10 m) transceiver system.
1) If I use CC1101, where can I find reference design and layout for 403MHz (I can find only for 433 and 868)?
2) If I use CC1070, which IC can I use as receiver IC that is compatible with it for 402 MHz (also I want refe5rence design for it for 402MHz) ?
If I start with CC1101 for 433MHz, how can I optimize it for 403MHz (any help appreciated) .
1) Note that the CC1101 reference design covers 315 and 433 MHz and hence also 403MHz.
2) You should be able to get CC1101 to communicate with CC1070
The reference design covers a wide range so you don't need to optimize. It depends on your antenna but for 10m range you should not need a lot of output power.
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In reply to TER:
Thanks a lot.When I use it for the design given for 433MHz, how will i tune it for 403?
In reply to Mihir Gupta1:
As you see here: http://www.ti.com/tool/cc1101em433_refdes the reference desing covers 315 and 433 MHz hence you should use the layout and component values from this reference design also at 403MHz.
Thanks for the link. I downloaded the file and came across a .txt file that contains some specification for 315 MHz. We have to make those changes in the components and the values for IC to work in 315 region. Therefore similarly I want to know what component values should I change to make it work at 403MHz?
If I need to keep the values same for both 433 and 403, then what changes in settings should be done for it to operate in 403? I will use the same layout, but I need to know the component values that differ.
I wast to use it according to MICS standard.
Sorry, I didn't see the .txt file when I looked at the zip file myself. As you see most components are one or two values larger.
For short range the 433MHz component values are probably good enough. Or you can try to scale the balun components by increasing the component values by 8%. (433/403). For a low E series this will not be possible.
I am not worried about the range, but worried about the frequency used, as MICS standard is ti be strictly followed. I need 402-405 MHz freq.What is E series? What is the problem with it?
I'm focusing on how to optimize the values of balun components, please show me how to calculate in detail?
Could you list the components that have change values (different 433MHz reference design)?
Thanks so much.
Bui Anh Kieu
From: Da Nang, Viet Nam
In reply to Bui Anh Kieu98922:
We have several customers using our radios in the MISC band at 402 MHz. Copy the CC1101-433 MHz and CC1170-433 MHz reference designs as is. No need to do any component tuning for operation at 402 MHz.
In reply to Sverre:
If I just copy 433 design, then won't it operate at 433???I need to know what changes (even if they are very small) are needed to be done? Or if not then how should I program it for MICS?
In reply to Mihir Gupta:
I didn't change any values of components in 433MHz reference design. It was successful with 408MHz frequency.
You can use SMARTRF to init register values.
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