I'm trying to help a friend solve a strange wifi problem.
The target room for wifi usage is across a small corridor from the room where the internet connection & router resides. The wifi connection allegedly worked before installation of a cable TV system. Other electronics might have been introduced around the same time frame to cause wifi malfunction, but it's purely speculation on my part as I do not live there and my source is fuzzy.
In my short test, I placed a laptop right next to the router ("Cnet" brand, model number unknown) and tried to establish a wireless connection. Wireless connection was detected and then disappeared. It would be detected and then disappear repeatedly. Then I tried with my Asus pocket wifi router, which has been working fine in my own apt. Same setup, router placed right next to the laptop. But I could not establish any wireless connection to the router at all. Both routers worked fine with wired connection in this location. The laptops used in both tests were a Sony Vaio with buit-in wifi and a Dell with a PCMCIA Asus WL-100b card.
Do interference usually just 'wipe out' a wifi device entirely, like my Asus router in this occasion? Could the cause be something else all together? How do I go about diagnosing the source of interference? Any help or pointers will be greatly appreciated.