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Wireless interference (4 posts)

I set up a wireless g broadband router(default channell 11)(DLINK dsl604GT connected to a netcomm VOIP adapter connected to a DECT cordless phone with base station and 1 remote handset, following the advice in your magazine.

The broadband router is connected to a PC via ethernet and speed test shows the 256k connection running at 230k, the VOIP phone function is good, with perhaps at little static at times, but there is a constant "hum" from the area where the equipment is, and the wireless connection runs very slowly on my laptop even when on the table 3 metres away (DLINK PCMCIA wirlessg card).

I thought it was the old win 98laptop, but when connected by cable to the router internet runs fast, so it must be the wireless g. I then put a wireless card in a windows 2000 computer in another room maybe 10 metres away, and although it detects the wireless network says the signal strength is too low. I know the brick interior walls may be a problem but the cordless phone and the VOIP cordless phone have no trouble out in the backyard even.

The manual for the router says not to have it near a cordless phone especially if it is 2.4GHz (it is and it 1 metre away as its attached to the router via the VOIP adapter!). It also says to change the phone to channel 1, far away from channel 11 (default for wireless g), but there seems no option on the phone to check or set channels. It also says to preferably use cordless phone at 900Mhz, but I haven't seen any other than 2.4GHz and don't know if that would be ok for VOIP. Any suggestions?

Re: Wireless interference

Its not so much interference as the fact that cordless phones and wireless LANs both fight for use of the same radio frequencies.

Even in ideal situations wireless LANs are a lot slower than ethernet cabling. And wireless LAN connections rapidly get slower still with distance and when they have to penetrate dense materials like brick. Insufficient signal at 10 metres and severely degraded speed at 3 metres is worse though than you should be getting.

Have you tried turning off the cordless phone just to see if it is the problem with your wireless LAN so at least you know whether its a conflict between the two, or something else?

Re: Wireless interference

Low signal level is caused by either insufficient transmit energy being radiated or interference swamping the signal, or the receiving equipments sensitivity. .

Insufficient transmit power is dependent on the router as well as its antenna (or connection to same, this connection s usually internal to the router). You may increase effective power at both the transmit as well as the receive end by the use of directional antennae.

You mention a lot of hum that is not a good sign. It is usually caused by earth connections of any of the equipment you are using, sometimes a faulty earth in one equipment causes a shared earthing through another equipment, the shared connection causing mutual interference.

This is rather general advice but is the best I can do as it is not a subject that can be fixed easily by remote advice. Sorry about that.

Andy Gomsi

in Africa it snowed More...

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