@gpaolo, the CPE510 is a Pharos device and as all Pharos devices it is designed for long-range PtP or PtMP directional links. It's intented for WISPs feeding their customers wirelessly or for bridging two networks over a long distance in the kilometers range. It's not well suited for standard clients as a standard AP.

That being said, the CPE510 has an antenna beam width of 45º H / 30º E to concentrate RF energy into one direction only (that's the meaning of »directional«).

You could use Pharos devices to serve standard consumer devices, but usage is very limited. Due to the nature of the directional antenna beam width of a CPE510 the covered area is only 0.828m (H) × 0.535m (V) at 1m distance from the CPE, that's just 8.28m (H) × 5.35m (E) at 10m distance. If you stand 10m apart from the CPE and the distance of your position is >4m aside from a right-angled line from the CPE, the WiFi signal is lost.

If you really want Pharos devices for your garden, then use a WBS210 with omnidirectional antenna TL-ANT2410MO (360º beam width) or with a sector antenna TL-ANT2415MS (120º beam width). But even with a sector antenna you would need to place the WBS 10m away to get ~30m area covered.

Do yourself a favour and replace the CPE by an EAP225-Outdoor. What you need in a garden is an access point to extend your network, not a router nor a firewall the Pharos devices provide for WISP applications such as subnetting for different customers.

@gpaolo, oops, £120 for an EAP225-Outdoor?

Hm, but WiFi regulatory provisions in the UK are still the same as in the EU, so I would order an EAP225-Outdoor (EU version) from Amazon in Germany for £70 (I sometimes order gadgets – execpt WiFi gear b/c of different regulatory provisions – from Amazon USA, they deliver also to Germany, so delivery from Germany to UK should be possible, too).

But if your garden is long and narrow, you could try to mount the CPE in an ideal distance to cover most of the garden, maybe on the roof pointing down or in your opposite neighbor's garden :-) Here is the formula to compute the covered area:

Maybe this helps you to find the best position.

@gpaolo, what exactly do you mean with the whole network crashes/WiFi crashing? If your phone leaves the covered area, it loses the WiFi signal and you can't see it in a survey anymore, but it should still be there. Or do other devices crash, too?

@gpaolo, I still don't understand. Is the PC connected wirelessly or on the network wired to the CPE?

I never experienced that connecting a device to a WLAN crashes the WLAN or the network. What I could imagine is that DFS caused the CPE to change the channel due to a higher priority service acquiring the channel (weather radar, satellite link, commercial broadcast equipment etc.) and this happened accidently at the same time you tried to connect using the smartphone. This is a normal channel release in the 5 GHz band which causes the WLAN to disappear until a new channel has been found. When I connect a laptop and an Android tablet to the CPE, the WLAN doesn't crash. But even slightly moves of the clients can lead to loss of the signal if the distance is too short (in the 1-5 meters range in my lab). It's a matter of the distance between CPE and the client.

The settings of the CPE are o.k. so far, albeit I would recommend 802.11n-only mode if your clients support 802.11n, too. As for the firmware v2.2.1 is latest. Release numbers have no meaning, it's just an internal number.