Re: Netgear Router Semi Failure info

Jonah wrote:

>Info only not a request for help although I would be interested if
>anybody has come across this type of half arsed failure.
>
>I had a Netgear 4 Port Wireless Router 3 months old.
>
>I went away for a few days end of March and whilst away there was a big
>electrical storm (I knew nothing about the storm till tonight)
>
>Came home, router is offline, rebooted, all seemingly OK.
>
>After which I have had endless niggling problems, nothing major just
>trivia like web pages failing to load, network connections dropping out
>for no apparant reason, lower than usual wireless signal strength,
>various strange problems but nothing obvious. Chased all sorts of
>possible causes, spyware, firewall probs, registry snarl ups but found
>nothing. Heard about the storm tonight from the guy I bought the router
>from who told me loads of routers had been fried by the storm that night
>and the following morning was chaos. Swapped my router for a spare and
>suddenly all is restored to normal and the degradation of the original
>router is now obvious.
>
>Checked the original router wireless output on a scope, down to 5mW
>should be around 85mW so it looks like the output RF was fried and
>damage was caused to the RJ45 I/O components. So it was working but not
>at full capacity, just enough to appear OK without deeper investigation.

It would appear that you have suffered a common problem in that
wireless routers are apparently susceptible to electrical storm
damage. http://tinyurl.com/95f6t

>I am amazed it was working at all, seems very lucky / unlucky I would
>have preferred an outright failure it would have saved me a lot of aggro.

Indeed.


Mike

On Sat, 23 Apr 2005 07:29:31 +0100, Mike <(E-Mail Removed)> wrote:

>>Checked the original router wireless output on a scope, down to 5mW
>>should be around 85mW so it looks like the output RF was fried (...)

Where did you find an oscilloscope that works to 2.4Ghz and measures
power output in milliwatts?


--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558

"Jeff Liebermann" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Sat, 23 Apr 2005 07:29:31 +0100, Mike <(E-Mail Removed)> wrote:
>
>>>Checked the original router wireless output on a scope, down to 5mW
>>>should be around 85mW so it looks like the output RF was fried (...)
>
> Where did you find an oscilloscope that works to 2.4Ghz and measures
> power output in milliwatts?

down the back of the sofa

Jeff Liebermann wrote:
> On Sat, 23 Apr 2005 07:29:31 +0100, Mike <(E-Mail Removed)> wrote:
>
>
>>>Checked the original router wireless output on a scope, down to 5mW
>>>should be around 85mW so it looks like the output RF was fried (...)
>
>
> Where did you find an oscilloscope that works to 2.4Ghz and measures
> power output in milliwatts?
>
>
Perhaps he or his employer has deep pockets and owns something like an
Agilent 54854A with a MATLAB package.

On Sat, 23 Apr 2005 18:15:16 +0100, NBT <(E-Mail Removed)>
wrote:

>Jeff Liebermann wrote:
>> On Sat, 23 Apr 2005 07:29:31 +0100, Mike <(E-Mail Removed)> wrote:

>>>>Checked the original router wireless output on a scope, down to 5mW
>>>>should be around 85mW so it looks like the output RF was fried (...)

>> Where did you find an oscilloscope that works to 2.4Ghz and measures
>> power output in milliwatts?

>Perhaps he or his employer has deep pockets and owns something like an
>Agilent 54854A with a MATLAB package.

4 channels and 4GHz of bandwidth and starting prices at only $42,000.
Yeah, that will sorta work.
| http://www.agilent.com/about/newsroo...4feb2003a.html
The think the Infinium service mark is in reference to the price
instead of the product. However, none of the associated applications
specific software modules seem to have anything to do with RF.
Mostly, they're wired datacomm performance and optimization packages.
It's easy enough to calculate the output power of a spread spectrum
signal on a spectrum analyzer, but this is a "scope", which is not so
easy. Maybe he meant spectrum analyzer[1].

Probably something more specific to 802.11 would be more helpful:
| http://www.home.agilent.com/cgi-bin/...OUNTRY_CODE=US
However, we would then miss out on the "scope".

[1] A common error when measuring spread spectrum power on a spectrum
analyzer is forgetting to add the decorrelated power output to the
observed peak signal level. If the measured power output on the
spectrum analyzer is 0dBm, the observed bandwidth of the signal is
26Mhz, and the IF bandwidth of the SA is 1MHz, then the total power
output is:
0dBm + 10 log (26/1) = 0dBm + 14dB = +14dBm
I suspect this might explain the difference in measured versus
anticipated output.


--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558

"Jeff Liebermann" <(E-Mail Removed)> wrote in message
news(E-Mail Removed)...
8><............................................... .....................
>
> Probably something more specific to 802.11 would be more helpful:
> |
> http://www.home.agilent.com/cgi-bin/...OUNTRY_CODE=US
> However, we would then miss out on the "scope".

I would still need a "Sugar Mammy"

E4402B-COM ESA-E Communication Test Analyzer, 9 kHz to 3.0 GHz From
US$21,631
E4404B-COM ESA-E Communication Test Analyzer, 9 kHz to 6.7 GHz From
US$28,778

8><............................................... ..............
>
> --
> Jeff Liebermann (E-Mail Removed)
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060 AE6KS 831-336-2558