iPhone XR: Here's nine things you need to know about Apple's 'affordable' iPhone
Apple is getting ready to open up pre-orders for its new "affordable" iPhone. Here's what you need to know.
Invisible problems are the hardest to fix, and until we evolve eyes that respond to radio waves, wireless will remain thoroughly out of sight. Radio engineers have long bypassed their organic shortcomings with specialised test equipment, the most highly prized of which is the spectrum analyzer. This sweeps through a band, plotting energy received at the frequencies where it’s found. With practice, all manner of problems can be recognised by the patterns they make.
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Caption by: Rupert Goodwins
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