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Not sure if helps, but take a look at this:
https://support.lenovo.com/gb/en/documents/ht077344
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Using a cable won't prove anything because as you say, when it is next to the router you get excellent speeds. Yep, I agree. I realised that after posting but came back and found your post about it, so expected the OP to ignore my suggestion. It's definitely a wireless signal strength problem with the Lenovo .... Yes.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 59997/15142kbps @ 600m. - BQM
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Apparently its is not dual band router, so 2.4Ghz only. So its not a case of one laptop being connected to a different slower signal.
Using a cable won't prove anything because as you say, when it is next to the router you get excellent speeds.
It's definitely a wireless signal strength problem with the Lenovo, because as both are connecting to the same SSID (2.4Ghz) one is fast and one isn't, at a distance. So its looking more like a hardware problem on the Lenovo along the lines of what I described previously.
If Talktalk are offering a free upgrade and engineer home visit its probably worth taking up their offer just to see if he can help, although its not something they would neccessarily be conversant with. If, after that there is no improvement, then I would contact the supplier or Lenovo direct about getting the wireless card checked out and making sure the antenna are connected, if you are unable to do this yourself due to it being inaccessible.
If you look at this link it will give you an idea waht you are looking at:-
http://cnet3.cbsistatic.com/hub/i/r/2013/06/06/c304f...
Thanks for that valuable information. I know what I'm dealing with here, this Lappy has wifi troubles. I bought it from John Lewis so hopefully they will take it back and I may look at an Apple Mac book etc. I have been a wndows man since 1990 so there is a learning curve.
Thanks agin, I appreciate it.
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Ahh Intel wireless...
Intel are great at processors but in wireless (and even worse in graphics) they are, errm, not so good.
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What amazes me is that IBM/Lenovo had this problem with as you say, rubbish Intel wireless cards 10 + years ago and if this I still the case haven't learn any lessons. At that time the company I was with spent £millions with IBM on product and on site support throughout the world and therefore had the clout to really have a go at IBM about this issue. In fact senior engineers and management were summoned to their UK head office. Their stock answer was "its a chipset incompatibility problem with the wireless routers/access points you are using". As we were using Cisco gear throughout the world and our staff were getting the same issues with multiple different home routers, supplied by their ISPs, this didn't go down too well. Funny how changing to what I think it was Realtek chipset wireless card removed all the problems. Of course this would invalidate the warranty, as fitting any other card would cause the laptop to not post as it was locked in the bios to the Intel. Hence the bios patches to remove the block which are available. Happy days.
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In 99% of Internet connectivity issues using wireless, testing using a network cable is the most sensible first step in any troubleshooting. No problem with that at all. Makes perfect sense.
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Indeed rogerfp Intel have shown a failure getting into the wireless business - this is well known in the semiconductor industustry where I work. Their most recent attempt was to buy the former Infineon wireless group in Munich. Despite rumours of up to 1000 people working on modem technology for end customer Apple, AFAIK they have little or no market share compared to the likes of Qualcomm, Mediatek, Spreadtrum etc.
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But I had read and forgotten the close up wireless working, at the time I posted. That was an error. Unless the OP happens to have a longgggg Ethernet cable  .
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 59997/15142kbps @ 600m. - BQM
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When speed reading posts it so easy to miss some relevant info, as I have done many times. It's still a perfectly valid troubleshooting step.
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As there's some doubt to the quality of the wifi card in the Lenovo, you could always try a USB wifi adapter instead like this one www.amazon.co.uk/300MBPS-Wireless-Adapter-802-11-Network/dp/B00VHPZBF6
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