PC router/Trannie problem

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KGB - 08 Jul 2009 16:30 GMT

Hi

I have just spent several hours trying to figure out a strange
computer problem. My home network consists of a desktop PC with a
wired connection to the router plus two laptops connected wirelessly
to the network.

This morning, I was playing with my Blade CP pro2 heli in my garden
and damaged my only set of rotor blades. In disgust, I put the heli
and Tx back in my computer room where it normally lives.

Some time later my wife complained that her laptop would not connect
to the Internet. Her PC showed an excellent connection to the router
and everything appeared normal, but there was no connection to the WWW
(or her emails). Having spent some time failing to solve the problem,
I discovered that my own (wireless) laptop showed the same symptoms
but that the (wired) desktop was fine, indicating a probable problem
with the router wireless signal.

I decided to switch everything off and reboot the router and laptops.
No change. I was just about to re-install the router settings - and
had even started thinking about a new router - when I noticed that I
had forgotten to switch off the Blade (2.4 gHz spektrum) Tx, which I
had placed on the shelf a few inches from the router. I switched off
the Heli Tx, tried the laptops and everything worked fine.

It would appear that, whilst my trusty 35mhz Tx is OK, the 2.4
spektrum Tx affects the router signal.

The moral of the story is - if your computer is giving problems, one
more thing to check is that your RC trannies are switched off!!!!!!

Regards
KGB

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Bambleweeny57 - 08 Jul 2009 16:52 GMT

> It would appear that, whilst my trusty 35mhz Tx is OK, the 2.4
> spektrum Tx affects the router signal.

Um, not really a surprise as 802.11 b & g use 2.4GHz

http://en.wikipedia.org/wiki/802.11g

BW

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Time is an illusion. Lunchtime doubly so.

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KGB - 08 Jul 2009 17:27 GMT

>> It would appear that, whilst my trusty 35mhz Tx is OK, the 2.4
>> spektrum Tx affects the router signal.
>>
>Um, not really a surprise as 802.11 b & g use 2.4GHz
>
>http://en.wikipedia.org/wiki/802.11g

Hi

I didn't realize that. However if my laptop could have connected to
the WWW, I might have discovered that for myself.

Perhaps I can blame the router for my erratic flying!!! 8^)

Regards

KGB

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PCPaul - 09 Jul 2009 19:43 GMT

>>> It would appear that, whilst my trusty 35mhz Tx is OK, the 2.4
>>> spektrum Tx affects the router signal.
[quoted text clipped - 9 lines]
>
> Perhaps I can blame the router for my erratic flying!!! 8^)

Nope, that's all you ;-)

2.4GHz radios err on the side of caution, they use spread spectrum
techniques to move their signal around all over the 2.4GHz band to find
the least noisy areas. That's why you don't need crystals, and frequency
flags, and radio organisers. Turn it on, it finds the Rx, they agree on a
set of frequencies to use and away it goes.

Anything else on 2.4GHz may not be quite so clever about it - for
instance your router is stuck on a preset channel and can't move away
from the noise.

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Gavin - 09 Jul 2009 21:12 GMT

>>>> It would appear that, whilst my trusty 35mhz Tx is OK, the 2.4
>>>> spektrum Tx affects the router signal.
[quoted text clipped - 17 lines]
>flags, and radio organisers. Turn it on, it finds the Rx, they agree on a
>set of frequencies to use and away it goes.

As I understand it the Spektrum start up, looks for a free pair of
frequency and then sits on them until it's turned off where it then
does the same thing. The Futaba system is the one that hops around.

Futaba will hop away from the interference (and at some point probably
hop back onto it according tot he hopping pattern it uses), the
spektrum just sits on the same channel regardless if the interference
starts after the tx picks it's frequencies.

>Anything else on 2.4GHz may not be quite so clever about it - for
>instance your router is stuck on a preset channel and can't move away
>from the noise.

Not to mention the routers preset channels are wide than the channels
used in spektrum, routers get 13 channels form the frequency bandwidth
whereas spektrum divides the same bandwidth into 80 channels.

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Miike G - 10 Jul 2009 17:32 GMT

>>>>> It would appear that, whilst my trusty 35mhz Tx is OK, the 2.4
>>>>> spektrum Tx affects the router signal.
[quoted text clipped - 21 lines]
> frequency and then sits on them until it's turned off where it then
> does the same thing. The Futaba system is the one that hops around.

Sanwa is another make that does the same.
Mike.

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Model Forum / Radio Controlled / Air Models / July 2009

PC router/Trannie problem