I have the following device/firmware version:
Mikrotik SXT LTE Kit (RBSXTR&R11e-LTE): [admin@MikroTik] > /system routerboard print routerboard: yes model: RBSXTR firmware-type: qca9531L factory-firmware: 6.41.3 current-firmware: 6.42.1 upgrade-firmware: 6.42.1
I located in a low-signal area with two 3G HSDPA bands available: 900 MHz with ~ -87Db and 2100MHz with ~ -111Db signal. My problem is the device ignoring the highest level 900MHz channel and trying to connect to 2100MHz. Sometimes it occasionally switches to 900MHz and I have 3+ Mb download. In a few minutes it jumps back to 2100 with almost no connection.
[admin@MikroTik] > /interface lte info lte1 pin-status: no password required functionality: full manufacturer: "MikroTik" model: "R11e-LTE" revision: "MikroTik_CP_2.160.000_v008"
First I tried to lock the band 8 (both in GUI and in console command), however is seems do not affect 3G mode at all - it still connects to 2100MHz
According the wiki I tried to grab the channels parameters to lock modem on desired cellid/frequency using command "/interface lte cell-monitor lte1", however my routerboard doesn't recognize the command:
I tried to grab desired information by using "/interface lte cell-monitor lte1" while it connected to 900MHz, I got the following:
[admin@MikroTik] > interface lte cell-monitor lte1 bad command name cell-monitor (line 1 column 15)
current-operator: 25701 lac: 111 current-cellid: 1085840 access-technology: 3G HSDPA session-uptime: 7m15s imei: *************** imsi: 257010016179403 earfcn: 3013 (DL freq 602.6Mhz) rssi: -87dBm
Then I tried to follow the wiki and use the AT command "/interface lte at-chat lte1 input="AT*Cell=1,,,3013,1085840". If I try it in console while modem is already connected it answers:
Then modem looses the connection and never connects again until USB power off or reboot.
[admin@MikroTik] > /interface lte at-chat lte1 input="AT*Cell=1,,,3013,1085840" output: +CGEV: NW DEACT ""IP"", "10.92.182.45",5
If I try the command while there is no connection yet or try to add the AT-string in the modem init string it replies with "+CME ERROR: 50" and no connection as well.
I tried to check the modem firmware upgrade using the wiki command, however it wasn't recognized by the routerboard as well:
The menu /interface lte just doesn't have the firmware-upgrade command.
[admin@MikroTik] > /interface lte firmware-upgrade lte1 bad command name firmware-upgrade (line 1 column 16)
Examining the lte log I found there is a AT*Band= ... command. With band 8 locked in settings it was "AT*BAND=1,79,147,0,128,0,2,0", with no bands locking it was "AT*BAND=1,79,147,480,589829,0,2,0". Unfortunately, there is no documentation for this command. I tried doing some experiments, interpreting the numbers as binary bands mask, I was able to see there was SOME effect (once I was able to make the modem to connect to 2G), however I failed to get the desired 3G 900 channel.
So, for now I cannot use the device to connect Internet and can only to be connected with my phone on the roof (The phone successfully connects to the 900MHz channel, however the signal is too week to have a good speed with the phone antenna)
Could somebody provide some help or clues? The only thing I need - to make the device to connect to 3G 900 channel and disable/ignore low-signal 2100 one.