which wireless router?

Billie Walsh bilwalsh at swbell.net
Tue Feb 26 05:48:35 UTC 2008

Larry Hartman wrote:
> On Monday 25 February 2008 01:14:16 pm Derek Broughton wrote:
>> Nils Kassube wrote:
>>> Derek Broughton wrote:
>>>> Nils Kassube wrote:
>>>>> Derek Broughton wrote:
>>>>>> How can it tell one has a better signal unless it's constantly
>>>>>> testing it?
>>>>> Yes, that's how diversity works, constant testing. You have 2
>>>>> receivers and monitor the signal with both antennas simultaneously.
>>>> Yeah, but you have two _transmitters_ too.  Or does it simply assume
>>>> that the one with the best reception must be the one which will be best
>>>> for transmitting?
>>> I don't think there are 2 transmitters too. They would have to transmit
>>> simultaneously and that would mean interference on the receiver side.
>> Well, two transmitters, or one transmitting via both antennas at the same
>> time would be the same problem...
>>> So
>>> the transmitter is switched to the antenna which had the better signal
>>> during the last reception period. That is the best choice because usually
>>> the signal quality for one antenna doesn't change very fast.
>> Thanks.  I used to hang out on alt.internet.wireless, but it was too
>> technical for me :-)
>> --
>> derek
> Interesting discussion.....I've dealt with some basic radio transmission 
> theory on and off the last few years.  It has been pointed out to me along 
> the way that if two antennas are operating at the same frequency at the same 
> time, that when they are a given distance apart, the signal strength 
> perpendicular to the axis of the two antennas greatly increases, while the 
> signal strength along that axis reduces. 
> This theory is why truck drivers employ two antennas for their CB's.  In their 
> example the typical width of a tractor cab is about the right width necessary 
> for signal strengthening in front of and behind the truck.  As was explained 
> to me, the improvement can sometimes be measured in terms of miles.
> Depending on the electronic environment, the employment of two antennas may 
> not always generate interference, but may be complimentary.  Dunno about 
> Linksys or any other vendor, but it is a consideration.
> Larry

Considering the difference between 27MHz, CB frequency, and the 2.4GHz 
of wifi the spacing on a Linksys may be just about the equivalent distance.

Life is what happens while your busy making other plans.

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