Best RFStudio configuration oc CC1110 with simpliciti for range

For the same antenna and output power you will get longer range for lower data rates (and hence RX filter bandwidths). Use 1.2 kbps settings from Studio.

Thank you for your answer.

Can you please helo me on another thing. If I reduce the data rate it will take longer to comunicate and then it will consume more power am I correct?

You are correct - there is a trade-off between current consumption and range.

For best range you should use the lowest data rate and hence RX filter BW possible (again assuming antennas and output power are the same). Lower data rate means longer time in active mode (RX and TX) for the same payload and hence increased average current consumption

Thank you for your help it was most welcome.

So  what are the diferences in RFstudio betewwen 1.2 kbps Optimized for sensitivity or Current consution? What changes? And what is sensitivity?

For range purposes turn on the Manchester showld help pr not? 

You find the sensitivity and current consumption performance figures for "optimized for sensitivity" and "optimized for current" in the data sheet. At 1.2 kbps the difference in sensitivity is 3 dB ("optimized for sensitivity"  is better) and the difference in current consumption is 2 mA  ("optimized for current" is lower).

Manchester will not improve the sensitivity and for the same bit rate you need to spend twice the amount of time in active mode (Manchester uses two symbols per bit).  

Thank you for all your answers.

I will make some tests with some smartRF configurations and see what is the best one.

Is there a way to change in real time the configuraion. SmartRF only gives me defines an that I cannot change in real time.

What is the expected diference in range in open field bettewn optimized for sensitivity or consuption?

Rule-of-thumb: For open-field and line-of-sight a 6 dB reduction in link budget (=output power + antenna gain(TX) + antenna gain(RX) - sensitivity) gives a factor 2 reduction in range.

One more thing.

I have 3 leds to show the user the strength of the signal.

What I need to know is how can I from RSSI and LQI I can get values to have 3 levels:

1) Very good signal (Will never lose it even with storms and other general interference)

2) Usable In most environments and it will work.

3) Not recommended might lose some communications.

Can I use the RSSI alone?
How can I mix the information from RSSI and LQI
What values must be used in each usability led?

Thank you...

LQI (Link Quality Indicator) is a metric of the current quality of the received signal. The LQI gives an estimate of how easily a received signal can be demodulated by accumulating the magnitude of the error between ideal constellations and the received signal over the 64 symbols immediately following the sync word. LQI is best used as a relative measurement of the link quality (a low value indicates a better link than what a high value does), since the value is dependent on the modulation format.

To simplify: If the received modulation is FSK or GFSK, the receiver will measure the frequency of each "bit" and compare it with the expected frequency based on the channel frequency and the deviation and the measured frequency offset. If other modulations are used, the error of the modulated parameter (frequency for FSK/GFSK, phase for MSK, amplitude for ASK etc) will be measured against the expected ideal value

RSSI is a signal strength indication. It does not care about the "quality" or "correctness" of the signal. LQI does not care about the actual signal strength, but the signal quality often is linked to signal strength. This is because a strong signal is likely to be less affected by noise and thus will be seen as "cleaner" or more "correct" by the receiver.

1. A weak signal in the presence of noise may give low RSSI and high LQI.
2. A weak signal in "total" absence of noise may give low RSSI and low LQI.
3. Strong noise (usually coming from an interferer) may give high RSSI and high LQI.
4. A strong signal without much noise may give high RSSI and low LQI.
5. A very strong signal that causes the receiver to saturate may give high RSSI and high LQI.