Re: [Gumstix-users] WiFi antenna required?

[Alex S. <ale...@gm...>]

Obs: when I sad: Without the antenna to complete the circuit (module-antenna) you has no impedance (or resistance) overloading the circuit.
I meant: Without the antenna to complete the circuit (module-antenna) you has open-circuit overloading the module.


On 18/10/2011, at 20:00, Alex Sartin wrote:

> I heard that the wi-fi modules has an potency controller. Its job is to sense if the wi-fi signal is weak and increase the wi-fi power.
> The job of the antenna is to capture and concentrate the signal between this controller and the external ambient. 
> If you don't have the antenna connect, in order to has a stable and "strong" connection the signal controller will increase its power until it get the good signal. But without the antenna this might never happen.
> Some possible effects is that the controller get overload and die !!
> 
> I noticed in my overo-board that the temperature without the antenna had increased !
> Another explanation is that your wi-fi module is expecting an antenna connect. The antenna is nothing more than an impedance (and resistance). Without the antenna to complete the circuit (module-antenna) you has no impedance (or resistance) overloading the circuit.
> 
> So by using the wi-fi without the antenna you works with the module's max power. At some point it would have to give it up and die ://
> Another thing: This applies to the bluetooth module as well !!!
> 
> I hope I could help, sorry about the english (I was in a hurry).
> 
> Alex.
> 
> On 18/10/2011, at 19:39, Steve Sakoman wrote:
> 
>> On Tue, Oct 18, 2011 at 12:14 PM, bwilkins <br...@ro...> wrote:
>>> 
>>> Can anyone out there tell me if powering a WiFi enabled COM such as the Air
>>> or Fire w/o an antenna is safe?  I have a few COMs that were powered on this
>>> way and the WiFi is fried.  Trying to determine the cause.  Thanks.
>> 
>> I often use COMs with no antenna connected and have never had one die on me,
>> 
>> Steve
>> 
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