Part Number: CC1200DK
I am using CC1200DK Eval Module, TI Development Kit and SMART RF for my range testing. The settings are :916MHz, 200KHz Filter Bandwidth, 19.2Ksps, 55KHz deviation.We are getting a connection upto 800 meter. We are looking for a range upto 1.3Km with the same setup. The transmitter is a Sensor module with XE1203 part from Semtech.
Could you please provide suggestions to improve the range using SMART RF studio? Do we need to change any RF register settings to get a better performance?
Thanks & Regards
Please rad through
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In reply to TER:
Thank you. It is really helpful.
In bench level analysis, we are able to communicate with Sensor. I tried at -105dBm sensitivity also. But in field it is not working.Is there any proper method or process to tune the RF registers like, starting for carrier sense, RSSI analysis using Preamble, then AFC and AGC?
Or these setting will be automatically taken care by Stack itself?
In reply to Sreejith Venugopal:
As covered in the app note: Have you calculated the theoretical range with your setup?
" care by Stack itself", which stack are you referring to?
RF calculation is meeting the range. Attached the image FYR.
Stack means, software/Register settings already given by TI.
Could you please share the register settings for 1.3KM range so that we can directly burn the program and test it using Eval board? If you can share a Software code , it will be really grateful.
The picture is missing in the post. Please use the "insert/ Edit Media" button to insert pictures.
For the range estimation, have you measured the actual noise floor where you do the test? Due to increased radio traffic the noise floor is most often higher than the thermal noise floor and has to be considered.
Unfortunately we don't have a database covering exactly what is sent to which customer. If possible, could you give a summary of what you have received here "Stack means, software/Register settings already given by TI"?
I have attached the range calculation. I used SMART RF studio and was mentioning about the standard settings given for 920 MHz, 2FSK. In RSSI window of continuous Tx at -105dBm also we are able to detect the data in bench level data transfer test.
I see that you have used -110 dBm as sensitivty. The sensitivity for your settings will be different due to datarate and different RX BW. Have you measured the actual sensitivity?
Do you mean that you are able to receive packet with -105 dBm?
Do you use a PCB antenna or whip antenna? When using the range estimation tool it's a requirement that you use the numbers that reflect the HW you are using. Is he TX power actually 14 dBm or something else for this module?
I have received packet at -105dBm. Antenna is Monopole Whip antenna available in CC1200DK Kit. The transmitter power is 14 dBm.
Still I'm missing some parameters to understand your results.
- How long packets do you use?
- Which PER limit do you set for the range tests?
Which PER did you see @ -105 dBm. Could you confirm that you manage to receive at this level where you did your range test?
- What is the noise floor measured with SmartRF Studio using cont RX and no known TX on?
- Could you post a map of where you have tested?
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