33&athird
Turn on & Tune in
Popular complaint is that the headbands break. Mine have never been broken, besides a small crack which I would call my own fault by shoving them into the pocket of my Carhartt, and now they seem a little loose from wearing them so much, but hey, they are 4 years old this year, that's expected right? I just bought a new pair at the store with a fresh headband. Still love 'em.
Yeah, I was reading some stuff about that...but they seem pretty solid, compared to many a $20 set...4 years is pretty grand, many I by at the lower end of things (ie;for computer,travel) I only expect a year out of, reasonably.
As for the old picture. That's almost certainly WWI gear, look at the clothing. As for how they worked; large horns collect sound, simple enough, but that alone would hardly find a plane. As I recall, they would triangulate a relitive positition using several sets of horns*. Also recall that pre jet-era planes, especially from WWI used noisy props, if you've ever been near an airshow, you can hear the older planes from quite a ways, barring amplification. Chances are, they were accurate enough...if they formulated a position with multiple horns, then it would work alright....still nothing compared to radar, though.
*ie; listen for relitive position in degrees with two sets of these things, draw up the distance between and match degrees...keep in mind, if they did this twice in a set amount of time, they could find general path and speed, even.
Actually, if an illegal radio signal is detected, they triangulate in much the same way (using signal recievers), and can find it extremely accurately.
You can also note the large radio antenna to the right, the square thing:yes:
(I find my 770 600 ohm somewhat hard to drive, even with the amp I use...out of my integrated out they sound half as good).
