![]() It's nowhere near as good as a real spectrum analyzer, but for the price and simplicity, it's a good tool to have. There may be some 27MHz and 49MHz modules that do this as well. ![]() but that only gets you several bands in the ~300-928MHz range. You could probably use chips similar to this for other frequencies, like TI's CC1100. I assume if you try modifying the circuit to go outside that range, the PLLs won't lock and you'll get nothing. There's no easy way to modify this to go out of that range, because the IC tunes to the frequency corresponding to the channel selected, and there's only 7 bits. Mikediv: It starts sweeping at 2.400GHz and stops at 2.527GHz. let me know what you think and if you have any questions/suggestions. There's not a whole lot to the project, but I'm debugging some other wireless stuff, and seeing the presence and strength of a signal tells me a lot, as well as making sure I'm not being clobbered by my PC's wifi.Īnyway, I attached some pics, and the object can be downloaded from the link above. I basically modified Beau's audio spectrum analyzer and SPI demo code to create this, as well as looking at some C code I found online for this module. Unfortunately it has a 12 pin 2mm header rather than 0.1", so I desoldered the old header and soldered a ribbon cable onto it directly, which I then plugged into a header I soldered to my proto board. The module is available from places like Mouser and Digikey for $9.75. I added in a peak hold option and a measurement cursor, although they're hardcoded in the code, so you can modify the code to work with whatever interface you want (buttons, RS232, etc). basically it loops through all 128 channels and draws the RSSI reading out to the VGA monitor. They also have an RSSI register, so you can read the tuned channel's power. These are really cheap ready to use 2.4GHz wireless modules w/ trace antennas (and even FCC Approved), which are tunable from 2.400GHz to 2.527GHz. it's a 2.4GHz spectrum analyzer using a CYWM6935 module.
0 Comments
Leave a Reply. |