On 09/20/2014 03:28 AM, Heinz Diehl wrote: > On 20.09.2014, Doug wrote: > >> First: Higher power does NOT increase noise in the signal. It just increases >> the amount of >> radio frequency energy in the general area, which may be "noise" to some >> _other_ piece of equipment. > > Yes, you are right. I was imprecise. What I meant is that barely > increasing Tx power is not verly likely to help. Increasing it over > the limit does more harm than good, leading to unstable connections > and data loss. > > The Tomato firmware wikibook says: > "Transmit Power: Sets the transmit power in milliwatts. High settings > may cause nonlinearity in the transmitter causing loss of data, > interference to other users and channels, and a high “noise floor”. It > may also overheat and shorten the life of the transmitter." > > I have experienced that myself while experimenting with it. A subtle > increase did no harm, but was no improvement either. Increasing the Tx > power further lead to a big amount of retransmissions and decreased > speed. > > > As you mention, increasing transmitter power without modifying the transmitter to handle more power would make it non-linear and the distortion would increase the error rate. Nowhere did I advocate raising transmitter power. I mentioned several ways of increasing the _signal strength_ by either moving the antenna to a better location--i.e., higher up and in the clear, or by finding an antenna with higher gain. It is obviously not within the purview of the average computer user to increase transmitter power. An antenna has "gain"--when it puts more of the signal into a specific area than one which spreads the signal in a large volume of space. Normally one thinks of an antenna putting out power in almost all directions, like the light from a bulb. Notice, however, that if you put a reflector behind a bulb, more light goes in one direction. It is also possible to get more _effective power_ in a circular--not globular--space by scrunching the radiation pattern down vertically into a horizontal pattern that resembles a phonograph record. So the power which is not going up towards the ceiling lights is now going out to other workstations.
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