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Questions tagged [sx126x]

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How do I calculate the hex value for the bandwidth setting on an SX126x?

I am programming a SX126x IC in GFSK modulation. I am trying to figure out if there is a formula to calculate the bandwidth. I understand that the BW can be programmable from ~4 to 500kHz. In the ...
1 vote
1 answer

Where is SX1268's frequency calculation formula shown in the datasheet?

The SX1261/2/8's datasheet describes the function to calculate the frequency to set the IC: Re-arranging the formula to find out the 4 bytes to send gives: \$ RF_{Freq}= \cfrac{RF_{frequency}*2^{25}}{...
0 votes
1 answer

SX126x IC: which is the correct frequency deviation formula?

SX126X IC datasheet page 88, I see two different formulas for the frequency deviation: Closest clue I can find is here: ...
0 votes
0 answers

SemTech SX126x antenna matching

SemTech SX126x, LLCC68. Please, I could not find the component values for a matching antenna at 433 MHz and +22dbm. Do you have a schematic and list of nominal values for this? I was only able to find ...
0 votes
1 answer

What is the logic design behind multiple pins for antenna output/ input on tranceivers

I am making my first transceiver using SX1261/2 and I am trying to understand the pinout of the antenna (input and output) pins. At page 101 I see a typical schematic and I want to know more about why ...
10 votes
1 answer

Quality factor in antenna matching / question about SX1261 LoRa transceiver

I have a question about how the quality factor is determined for RF antenna matching, especially for PI network matching. The reason for the question is the Reference Design for antenna matching for ...