Queries related to CC1111f32

Hi TER,

Thanks For your prompt response....It is very helpful for me.

Just one query does PCB antenna support for 100 Meter distance??

awaiting for your valuable response

Hi CHS,

Thanks for quick response....

Please help me for below queries.

1. Kindly let us know, does the ground reflection effects on CC1111F32(wireless MCU). As we use this on the ground does it has  to any fluctuations in it . Does it decreases the transmission distance?
2. Does the temperature changes may effect on  board- please mention the operating maximum and minimum temperature.
3. If we use the boars above 20-30 cm from ground level, does we require any external amplifications.
4. If the Receiving ability of antenna increases, Can the transmitting power should be kept constant or it can be decreased ?

Awaiting for your valuable response

Hi,

As you see in the design note DN018 as TER referred to, the height above ground makes a large input on the performance. So does the settings and choice of antenna. I do not know what settings you are to use and neither what kind of environment you will have for your application (urban, line-of-sight, inside a building?) which all will affect the range you will get. Have you tried using our kits and tested these to see if you get the needed range? It is hard to tell if you will need more amplification without knowing more about your application and settings. Temperature will affect performance, see the datasheet for more details. Note that you will need to re-calibrate if the temperature changes a lot between transmissions, see more in the datasheet.  

Hi CHS,

Thanks again for your response.

Please help me in below query.

We will have multiple nodes which will placed almost on ground. These nodes will communicate with one repeater with in 100 meter distance. Since node is working on battery and we want CR2032 kind of battery to be working for 3 months and above, so we prefer to have less power consumption in nodes. Since repeater is powered with AC, so there giving more power is not problem. So can we have the minimum TX and RX power at nodes and more powerful TX and RX at repeater? Will it work?

Awaiting for your valuable response.

Please confirm that you have looked at the calculations in DN108. The range will be very dependent on which datarate and other RF parameters you are using. Without knowing the main RF parameters in your system it is not possible to answer your question.

By using Matlab, Octave or Excel you can easily doing some calculations based on the equations in DN108 yourself. Doing this you can easily change the output power and how effective the antenna is to see the impact on range.

Hi TER,

Thanks for all yours replies.. It helped us alot...

Please help me for below query

Kindly let us know that, can we use 0402 package resistors and capacitors in RF circuits. As we are using 3.6v battery to operate sensor. Through this package, Is there any effect of voltages and currents on the board. And which package is best suits for RF circuits.

Is there any design consideration?? Is there any application note regarding same??

Awaiting for your most valuable response.

Please note that all of our reference designs (http://www.ti.com/product/CC1111F32/toolssoftware#TIDesigns) uses 0402.

Hi TER,

Thanks for all previous support..

Now i have doubt about antenna.

Kindly let us know that can we use chip antennas instead of PCB antennas. What is the difference between distance covered by both antennas. Kindly provide if any reference document available on antenna selection.

Awaiting for your valuable response.

The only reason to use a chip antenna is normally area constraints. A PCB antenna  has better performance and a lot cheaper. See also http://www.ti.com/lit/an/swra161b/swra161b.pdf

Hello TER,

Thanks for your valuable help....

Will let you know any further help is required.