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.