anyone who knows anything about RADIO

[xfer]

I don't know shit about radio transmissions, but reading up on them, I became curious about this:

http://en.wikipedia.org/wiki/DX_communication

The angle of refraction places a minimum on the distance at which the refracted beam will first return to Earth. This distance increases with frequency. As a result, any station employing DX will be surrounded by an annular dead zone where they can't hear other stations or be heard by them.

I don't understand why that would cause a "dead zone". If I start broadcasting with DX, suddenly I can't receive or transmit radio signals at all? Is that because of the weird tilt I have to put on my antenna (or dish, whatever), and I can only receive other DX communications or something? Maybe even just rephrasing it would help me understand.

 

[avi]

does that have to do with waves cancelling eachother out? I don't really know anything about DX, but I know a decent amount about radio (my brother-in-law is manager/engineer for a fairly large station).

 

[xfer]

I think I know what you're referring to, and I don't think so. BCO is actually being pretty helpful on the subject right now, so I might not need this thread soon.

 

[xfer]

You're talking about, um, reversing the amplitude or something, the way they do with noise-cancelling headphones?

 

[avi]

yeah, that's along the same lines of what I was saying. same principle at least.

 

[avi]

ah, after reading that other thread it makes sense. I didn't read the wiki thing or anything, so I totally misinterpreted the issue.

 

[xfer]

okay, this is totally different. AND BCO was useful and I think I figured it out!

so, posting monkeys, stop your frenetic research, I'm all set!

 

[Josh Seipp]

ok phew!