In my kitchen there is a compact portable dab radio. It is a about the size of a small brick. It's connected to the mains but it can also take 4 AA batteries; rechargeable AA batteries with lithium can store 2500 milliamps these days. I set the default station to BBC radio 4, a station about stories and debate, a talk station with no adverts. BBC radio 4 is presently transmitted throughout the island of Britain.
I thought its clever how dab radio works. They send coordinates that describe how to assemble the sound wave as codes. The codes are identified by interruptions in the signal, the length of the interruption affects the character that is chosen.
Even though a small amount of coordinates are sent, the processor connects the dots and finishes the sound wave. By doing this they can cram hundreds of stations into a small band width and if some of the signal is damaged, the code still gets through because the computer in the radio is looking at the spaces between radio pulses to extract the information.
I was looking at pocket radios earlier on the internet. It would be nice to perch a pocket radio on my desk and listen to people talking while I work. I saw a nice yellow one that looks like the old Sony walkmans but it has dab digital radio. Then I saw the azatom one.
Looks a good size and a bit more modern than the yellow one. The phone can do all this but it needs the internet and if the signal is interrupted for one minute it quits.
