手机-可以通过编程方式以射频广播吗? [英] Mobile phone - can it programatically broadcast at a radio frequency?

问题描述

有可能使手机以一定频率发射任意无线电波吗?还是Mobile OS仅允许更高级别的访问?

Is it possible to make a cell phone transmit arbitrary radio waves at a certain frequency? Or does the Mobile OS only allow higher level access?

如果答案是否"(如我预期的那样)，是否有任何方法可以使电话与其他电子设备远程通话而无需握手等?

If the answer is 'no' as I expect it is, is there any way to make a phone talk to another electronic device remotely without handshakes and the like?

推荐答案

可能不是-如EFraim所述，已有监管框架规定A型设备必须使用XZ范围内的频率，且不得超过一定的功率输出.

Probably not - as EFraim indicated, there'll be regulatory frameworks in place to say that devices of type A must use frequencies in the range X-Z with no more than a certain power output.

此外，还有一些物理问题，并且要能够在不同频率下进行广播，还需要使用不同长度的天线，当然，如果您要在UHF范围内进行广播，则天线的长度将与手机所使用的微波范围完全不同(2.4GHz).天线与频率不匹配会产生各种奇怪的影响，从而破坏输出电路.

Additionally there's physical issues as well as to be able to broadcast at different frequencies requires different length antennas, certainly if you wanted to broadcast in the UHF range, the length of antenna would be radically different to the microwave-range that mobiles use (2.4GHz). Failing to match the antenna to the frequency can produce all sorts of odd effects that can destroy the output circuit.

因此，唯一可用的项目将是手机本身显示的项目，即蓝牙和红外线(如果存在).某些手机​​还具有WiFi，因此它实际上取决于您实际需要什么.

Thus the only items available are going to be those that the phone itself presents - namely bluetooth and infra-red (if it exists). Some phones also have WiFi as well, so it really depends what you actually need this for.

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