Hello friends. Recently I came across the same problem identified by many with a notebook Dell Inspiron 15R 7520 with the Dell Wireless 1703 (Atheros chipset). After losing an entire afternoon and looking at forums and their complaints, I think I found the solution to the problem (at least, here is running). The notebook is connected to a router TP-Link TL-WR740N. The router is factory configured to operate with a frequency of 20 or 40 MHz, making the switching automatically. The wireless card driver notebook is factory configured to work only with 20MHz. But can be configured to work with the two frequencies being adapted automatically. To do this, change the configuration (in Windows 7): Start> Control Panel> Device Manager> Network Adapters> Dell Wireless 1703 802.11b/g/n (2.4GHz)> Click on the Advanced tab> select 802.11n Bandwidth. Change the value to Auto 20MHz/40MHz. Press OK and wait reconnect. Hope this helps. Jeferson Vasconcellos
Hi, I have acquired a Dell Inspiron 7520 for a week now, and I've been having a strange issue with internet connectivity since then. Firstly, the wifi takes a lot of time to connect. Following, every 10 minutes I'm online, my network access stops working completely. But if I just CLICK on the network icon in the tool bar, it starts working again, but it stops in the next 10 minutes again, and so on. If I try to repair connectivity problems, it always find and fix some problem in the network adapter or wireless point, but then again, after 10 minutes or so, it happens again. My network adapter is a Dell Wireless 1703 802.11b/g/n 2.4ghz and I have tried to update it and to re-download the firmware, but nothing seems to fix it.  What should I do to fix this?
Problems with internet connectivity with Dell Inspiron 7520 (Dell Wireless 1703 
802.11b/g/n 2.4ghz)