I have Peplink Max HD2 IP67 with two SIM cards and I’m trying to get reliable LTE transmission.
To test possible solutions I use this kind of antenna:
with short RF cable. It is a set of 2 pcs, distance between antennas is 10-15 cm.
I connect antennas to Cellular1
The first SIM card :
Peplink CLI reports band LTE Band 1 (2100 MHz) and RSSI -74 dBm. Without antenna I have 10 dB less (~85 dBm).
Second SIM card - the difference between both signal strengths is similar, -86 dBm vs -80 dBm with antennas.
The Cellular modems are connected to 1800 MHz and 2100 MHz.
This is very strange for me: when I move the same (first) SIM card into my phone, application reports signal strength from range -55 to -61 dBm, it is a 20 dB better value than Peplink. Do You think that I should worry about signal levels?
Finally I want to use both SIM cards from different service providers with 4 antennas, two omnidirectional and two directional.
I plan to connect SIM1 to Cell1 main (omni) + Cell 1 diversity aux (directional). SIM 2 will be connected the same way - Cell2 and Cell 2 diversity aux.
Do You think it is a good setup?