I have two HC-12 modules being used for wireless communications at 433Mhz. One station is in a building (wood frame house) and the other is stationary in a small enclosure made of plastic about 400 feet away. This is for a wireless weather station app. Both the transmitter and the receiver are at fixed locations. I had trouble using the included 'coil' antenna that came with the module. I replaced it with an 8 inch wire standing up vertically on both units connected to ANT2 through hole pad on part. This allowed for communications but still had some fairly significant error rates. When I move the outside module to within say about 200 feet everything works properly.
My question:
What is the best antenna option for a setup like this? There is a mini-coax antenna connection also available on the part. Would it be better to use that with an external antenna and if I can is there a limit to the length of the coax to get to the antenna? I was thinking of placing the antenna on the outside of the house with a more direct line of site, but I am not sure how to use the onboard mini SMA connector and what antenna to use? Any help appreciated! I have attached the datasheet for the HC-12. I am using FU-3 mode at 9600 baud.
My question:
What is the best antenna option for a setup like this? There is a mini-coax antenna connection also available on the part. Would it be better to use that with an external antenna and if I can is there a limit to the length of the coax to get to the antenna? I was thinking of placing the antenna on the outside of the house with a more direct line of site, but I am not sure how to use the onboard mini SMA connector and what antenna to use? Any help appreciated! I have attached the datasheet for the HC-12. I am using FU-3 mode at 9600 baud.
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