my qustn is that i like to know the correct IF frequency and Automatic gai control settings for 250kbaud data rate and 541khz rx filter bandwidth using 2-FSK,and MSK...
I also like to know the settings of Deviation and phase transition time as this i m not getting in smart Rf studio 7...
please confirm the settings
You do get the IF frequency from SmartRF Studio.
For 250 kbps, 541 kHz RX filter BW FSCTRL1 = 0x0C, which corresponds to an IF of 304.7 kHz.
In SmartRF Studio 250 kbps is one of the "typical settings" and selecting this one will give you the optimum register settings for the selected data rate.
MSK will not give you any advantages over 2-FSK (well, in theory yes, but not how MSK has been implemented in CC1101). For MSK you can choose 2-FSK and use a modulation index = 0.5 (i.e frequency deviation = data rate/4)
Thankz sir for your significant advice .
But i m still confused that at 1.2kbps which is minimum baud rate of 2-FSK ..what will be the deviaiton and rx filter banwidth and IF also
Please use SmartRF Studio. Select the 1.2 kbps "typical setting". The deviation is then set to +/-5.2 kHz and the RX filter BW is 58 kHz. The if frequency is sset by register FSCTRL1 as 0x06 (=152 kHz with 26 MHz crystal).
Increasing the frequency deviation will improve the sensitivity, but a more accurate crystal needs to be used.
I go through the reveal configuration(1.2kbps,5.2 deviation,58khz rx bandwidth,0x06 IF frequency).
still my hardware is not working .
Can you please provide some more information regarding the issue you are seeing? I understand that you use settings from SmartRF studio, but you say your hardware is not working. In what way is it not working, not transmitting, not receiving, neither transmitting or receiving, to little output power or something else? Have you tested your HW with our SW to make sure that there are no issues with the SW?
-- PS. Thank you for clicking Verify Answer if this answered your question!
my transmitter is transmitting but not recieveing below 26kbps.
below 26kbps reciever is not working.But according to the datasheet it must communicate on and above 1.2kbps.
So if I understand correct, you are receiving above 26 kbps. When altering the data rate below 26 kbps, I assume you change the RX filter bandwidth? Have you looked at the transmitter and verified the frequency offset? Have you tried receiving using a large RX filter bandwidth and a low data rate (just to check if it works, not a recommended solution)? What output power level are you transmitting with and what is the distance between the transmitter and receiver? What frequency band are you using?
I m using 541khz rx filter BW with 1.2kbps. Earlier i tried the recommended settings which did not work.
Output power level is 12db.Distance is 1meter. Yup i verified the frequency offset.
I am working in 865mhz ISM band.
can you please provide all your register settings so that we can review them? Have you tried either increasing the distance or lowering the output power of the transmitter to make sure that the receiver is not saturated? what is the RSSI you read when you are able to receive? What frequency offset do you see?
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