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Does anyone know of a good/affordable way to test the frequency range of a RF device (e.g., Bluetooth module)? Not spectrum analysers since they're rather unaffordable. Are there relatively affordable tools for measuring the range? I heard about SDR, but AFAIK they don't do 2.4Ghz. How about RTL-SDR with downconverter, perhaps with something like this? Is it accurate?

How about HackRF?

Any help will be appreciated.

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Spectrum analyzers are the tools of the trade. If you cannot afford one, lease one. If you cannot afford a new one, get a used one. Also, There are several spectrum analyzers at the sub 1K USD range, mainly USB based devices such as the Signalhound SA44.

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Wi-Spy is a USB spectrum analyser for 2.4 GHz. It is designed for tracking down interference with WiFi networks so it won't be as frequency accurate as a more expensive and bigger analyser.

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