I think discomp.cz has everything you need. → wrong, they seem to not sell MHF to MHF cables (and especially not MHF I to MHF I ones - those are needed). As I do not want so search for other distributors I linked one possible cable from a manufacturer originating in Germany I am pretty much happy with.
edited
I’ll edit this post later today with a detailed upgrade accessory list and links.
Maybe I’ll later on improve it with pictured instructions for TO when the cards arrive.
edit:
What you have
- Turris Omnia housing with 5 pre-drilled holes for pigtailes
- 3 antennas
- 2 WiFi-cards that want to be replaced
- 2 diplexers
- 4 UFL to UFL cables
- 1 UFL to RP-SMA cable
What you want:
- Usage scenario LTE-router: 2-3 holes for LTE-access (3 if you want to have also an external GPS-antenna), 4 holes for WIFI
- Usage scenario AP/router for (V)DSL/cable/SFP-modem or SFP-modem+router: buy 2 AW7915-NP1, 2 heatsinks
- cheap
- drill 1 more hole
- buy 3 UFL to RP-SMA cables, 3 antennas
- buy 2 diplexers, 4 UFL to UFL cables, 1 antenna
- cheap
p.s.: It may make sense replacing the standard antennas with other external antennas (e.g. those) and additional cabling, but that absolutely depends on the usage scenario/architectural conditions and is off topic in this thread.
edit 2: just wanted to crosslink @Pepe 's thread about replacement parts where I borrowed some links - thanks