3 ms·
I received a hand cranked emergency flashlight for free somewhere a few years ago. Turns out it also happens to have a simple AM radio built in. It's probably t
by bane 6y ago
I received a hand cranked emergency flashlight for free somewhere a few years ago. Turns out it also happens to have a simple AM radio built in. It's probably the only working one inside my house, but in a pinch it'll do.
- yodelshady 6y agoIn a pinch my guitar amplifier will do (I don't mean after some soldering, either). AM radios are comically, wonderfully easy to build. Easy to build by accident, in fact. In retrospect I've no idea how practical physics labs are approved, with the likelihood that some klutzy undergrad (yo) accidentally builds a high-power broadband AM transmitter.
- hazeii 6y agoIt's not easy to build a high-power narrow-band AM transmitter, let along a broadband one. The issue is the long wavelength makes aerial matching difficult (at 1MHz the wavelength is 300 metres, i.e. speed of light/frequency). AM transmitters for national use generally run 10's to 100's of kilowatts of power [0], and longwave is even higher, e.g. UK Radio 4 is 500 kilowatts. Pretty unlikely to build a high-power one by accident :) [0] http://www.mediumwaveradio.com/uk.php http://www.mediumwaveradio.com/uk.php