EM7455 Lock to Band 41

[terryjett]

Using Jim's spreadsheet to generate correct code for locking EM7455 to band 41, but modem will not connect after reset. Before I go into more troubleshooting want to make sure every thing is correct with code.

This is what I have after spreadsheet: AT!BAND=10,"SP41",0,10

Entered that into modem and did reset. Modem would not connect.

Know can get band 41 as modem connected for little while and then got on band 25.

Here is info from modem:

Code: Select all

AT!BAND=?
Index, Name,                        GW Band Mask     L Band Mask      TDS Band Mask
00, All bands                     0002000007C00000 00000100330818DF 0000000000000000
01, Europe 3G                     0002000000400000 0000000000000000 0000000000000000
02, North America 3G              0000000004800000 0000000000000000 0000000000000000
06, Europe                        0002000000400000 00000000000800C5 0000000000000000
07, North America                 0000000004800000 000000000300185A 0000000000000000
08, WCDMA ALL                     0002000007C00000 0000000000000000 0000000000000000
09, LTE ALL                       0000000000000000 00000100330818DF 0000000000000000
10, SP41                          0000000000000000 0000000000000010 0000000000000000

	   0000010000000000 - B41    
	   0000000020000000 - B30    
	   0000000010000000 - B29    
	   0000000002000000 - B26    
	   0000000001000000 - B25    
	   0000000000080000 - B20    
	   0000000000001000 - B13    
	   0000000000000800 - B12    
	   0000000000000080 - B8     
	   0000000000000040 - B7     
	   0000000000000010 - B5     
	   0000000000000008 - B4     
	   0000000000000004 - B3     
	   0000000000000002 - B2     
	   0000000000000001 - B1     
0002000000000000 - B8  (900)
0000000004000000 - B5  (850)
0000000002000000 - B4 (1700)
0000000001000000 - B3 (1700)
0000000000800000 - B2 (1900)
0000000000400000 - B1 (2100)

OK

Modem is running generic firmware and WE826 is on latest WiFix.

[JimHelms]

Using Jim's spreadsheet to generate correct code for locking EM7455 to band 41, but modem will not connect after reset. Before I go into more troubleshooting want to make sure every thing is correct with code.

This is what I have after spreadsheet: AT!BAND=10,"SP41",0,10

Entered that into modem and did reset. Modem would not connect.

Nope, it is not adding them correctly. It should be:

Code: Select all

AT!BAND=10,"B41",0,10000000000

Guess I need to separate the spreadsheets to apply to a single line of modems, as opposed to adding other devices.

Good catch, and I am surprised no one caught it before.

UPDATE: The current spreadsheet seems to calculate them properly.

Create Custom Bands (11-02-19).xlsx

[terryjett]

That did the trick, thanks Jim.

I was close on my second attempt, my command was one zero short

On band 41 now with jerry rigged antennas:

Code: Select all

AT!GSTATUS?
!GSTATUS: 
Current Time:  406		Temperature: 38
Reset Counter: 1		Mode:        ONLINE         
System mode:   LTE        	PS state:    Attached     
LTE band:      B41    		LTE bw:      20 MHz  
LTE Rx chan:   41094		LTE Tx chan: 41094
LTE CA state:  INACTIVE    		LTE Scell band:B41    
LTE Scell bw:20 MHz  		LTE Scell chan:41292
EMM state:     Registered     	Normal Service 
RRC state:     RRC Connected  
IMS reg state: No Srv  		

PCC RxM RSSI:  -90		RSRP (dBm):  -120
PCC RxD RSSI:  -85		RSRP (dBm):  -114
SCC RxM RSSI:  -98		RSRP (dBm):  -120
SCC RxD RSSI:  -97		RSRP (dBm):  -119
Tx Power:      22		TAC:         1F19 (7961)
RSRQ (dB):     -9.2		Cell ID:     03FB0331 (66782001)
SINR (dB):      7.0

[BillA]

Speaking of Sprint bands, Tmobile is now allowing Sprint customers to roam on the Tmobile network, but not the other way around, yet. Last night I have forced my Tmobile phone onto the three Sprint bands 25, 26, and 41, but no signal at all, hoping it will change soon.

[terryjett]

Speaking of Sprint bands, Tmobile is now allowing Sprint customers to roam on the Tmobile network, but not the other way around, yet. Last night I have forced my Tmobile phone onto the three Sprint bands 25, 26, and 41, but no signal at all, hoping it will change soon.

Good news to know. All the damn towers around us (at&t, sprint and t-mobile) are so overloaded. might as well be on AOL 56K during peak hours...

[BillA]

Good news to know. All the damn towers around us (at&t, sprint and t-mobile) are so overloaded. might as well be on AOL 56K during peak hours...

Teeeeeee-dooooooooo-screeeeeeeech... really miss those old days.... not! lol
This is probably the worst possible time to test the speed on different carriers, because most of them are being overloaded at all times of the day and even night due to this stay-at-home economy.
I will keep on testing my Tmobile phone forced onto Sprint bands, and will post it as soon as it starts working.