baldog wrote

Sorry what does mcs stand for/how do i alter it?

MCS = Modulation and coding index. Boring tech stuff, what's important to the average user is the resulting wireless speed, which depends on channel width and mode. See http://mcsindex.com/ if you are interested in the nitty-gritty details.

Now I've managed a link between the two sites how do i go about plugging this into my lan? I've got an asus router with wan in however when i plugged it in there the two routers on died due to ip conflicts. I'd like to keep things separate so there would be one lan at one side and another at this side?

If you use client mode to connect to the AP, you will get one big local area network. Make sure the IPs of all devices in the LAN are unique.

If you rather use AP client router mode to connect to the AP, this will result in two LANs: one the AP and the wireless part of the client are members of and one the wired devices are member of. Make sure to read the documentation carefully, it's somewhat challenging to configure this mode.

baldog wrote

Ah ok thanks. So i'm presuming you mean knock the channel width down to 10MHz?

Makes no sense IMHO. In the 5 Ghz band, WiFi channels don't overlap, so you can use the full channel width of 20 MHz if there is at least one free channel.
The transmission power will not change by reducing speed, only the modulation codecs, which could improve signal-to-noise ratio (SNR). But you have to try at the installation site to find out. Much more important is correct antenna alignment to improve signal strength/SNR.

Is there a 'how to' i'm able to follow anywhere to set the two sites up as separate lans or would you be able to give me a rough idea?

Setup is straightforward. In AP client router mode, the WiFi radio link operates as a client connecting to the remote AP. Additionally, routing functions are available for wired devices and wireless devices if you also use the local AP. See the docs, in section Operation Modes (page 9) to get a more clearer picture of what this mode does despite regular client mode:

http://static.tp-link.com/PharOS(UN)_V2_UG_1479881566519n.pdf

Great! Have fun! ;)

How do you measure this? Using built-in speed test or by looking at the graphs on the Status page? If rate goes down, for how long and is this during transmission of data or in idle phases?

baldog wrote

By looking at the figures on the right hand side of the status page of the cpe towards the bottom.

No reliable source for measurements. WiFi gear always negotiate speeds dynamically and it will drop if no data has to be sent. Furthermore, SSID beacons are always sent using the lowest speed for backward-compatibility. So, such "drops" are not unusual. For wireless throughput the built-in speed test is important. To measure data throughput, an external iperf setup should be used.