Normally performance might noticeably decrease with each additional device. It’s recommended that less than 8 devices connect to the APs simultaneously, otherwise the TL-WA5210G cannot process data...

As far as I know, there is no option to disable the NAT on the software settings. If you do not use the WAN port, then there is no NAT.

Here is a download link for Atheros cards but not sure it is for AP mode or not: http://www.atheros.cz/atheros-wireless-drivers.php It seems that your card TL-WN651G did not support soft AP fucntion.

For the Iphone and Ipad connection to TP-LINK, you can try to change the channel to number 6 on wireless settings page and the channel width to 20MHZ. These two settings normally can make the iphone...

You can try to do the WDS function on TL-WR1043ND. Here is the detailed instruction: http://www.tp-link.com/en/article/?faqid=227

It seems that the connections between two Powerline adapters are not stable. Check the lights on the powerline adapter and make sure all three lights are green on,especially the second light. If they...