Sim 7000g intermittent cellular signal

[brownjug]

I have had 3 modules and on my 4 th ,, Everyone of the modules experience a loss of signal periodically , and are not dependable to be there when needed, I am trying to adapt another antenna on the LTE connection, but I haven’t secured a proper signal with anything I try,, I noted that I cannot receive or transmit anything when the signal is above (-98 dbm). Do you have any suggestions on a better antenna!! Is the arduino shield not powerful enough to operate a higher gain antenna?

[botletics]

What SIM card are you using? Make sure the SIM supports LTE CAT-M, not just traditional 4G LTE like in most phones. The antenna shouldn't be a problem, and LTE CAT-M has better building wall penetration than traditional 4G LTE.

[brownjug]

Thx , Yes I have the hologram SIM, I have been developing my own Gps tracker program for vehicles, but I always go back to yourLte 7000 example to ensure proper commands and such. It doesn’t matter whether I use your program or mine I have the same problem! Today I rigged an old satellite dish (24 inch’s). And installed the antenna as you would a LNB for TV and was able to achieve a stable signal, pointed directly at the cell tower about 1/2 mile away! That’s not what I really want to do!! I also made an extension cable for the supplied antenna and tried remotely mounting ,, that didn’t work. The loss’s were about 20 dB on a 10 ft extension, I was thinking of using a a bigger coax, maybe a RG59 or RG 6 even. Would that help the signal?? Thx for getting back to me, I want to mount this unit in a small chassis and attach to ignition system on a vehicle! And need dependable remote operation??

On Sun, Feb 23, 2020 at 10:15 PM Timothy Woo notifications@github.com wrote:

What SIM card are you using? Make sure the SIM supports LTE CAT-M, not just traditional 4G LTE like in most phones. The antenna shouldn't be a problem, and LTE CAT-M has better building wall penetration than traditional 4G LTE.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/botletics/SIM7000-LTE-Shield/issues/166?email_source=notifications&email_token=AD3X4RHNRKGOHZW23NYELA3RENJV5A5CNFSM4KZW2CHKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEMWUSFA#issuecomment-590170388, or unsubscribe https://github.com/notifications/unsubscribe-auth/AD3X4REDTKK6LTJF5IKDSRTRENJV5ANCNFSM4KZW2CHA .

[ahuangJM]

I am experiencing the same problem as well.

I am currently using SIM7000G and using Rogers Canada SIM card. I don't yet know how to find out if their SIM card supports LTE CAT-M or not, but I will figure it out today. Perhaps by calling them. EDIT: Rogers Canada SIM card only supports LTE and LTE+. But should this really be a problem though, since I don't experience any of the same problem with FONA 3G.

I didn't do a detailed signal measurement like @brownjug to see what's wrong. But I have noticed that the shield often loses service.

I am collecting data from weather stations and sending the data back via. text. The stations lose services quite frequently and for a long time. EDIT: I think it is important to mention that the said weather stations are still be developed and they are still indoors in a city. They are not in the middle of nowhere. So providing cell service should not be a problem.

I changed the service APN to "ltemobile.apn" instead of "hologram" used in the example codes. https://www.google.com/search?q=Roger+apn&oq=Roger+apn

An example of the service lost is:

[ejri]

@ahuangJM have you been able to connect to rogers' LTE-M?

I'm trying this combination of Rogers' APN, and LTE Cat-M, but it doesn't seem to connect.

// rogers const char apn[] = "ltemobile.apn";

      //2 Auto
      // 13 GSM only
      // 38 LTE only
      // 51 GSM and LTE only
      modem.setNetworkMode(38);
      delay(500);

      /*
          1 CAT-M
          2 NB-Iot
          3 CAT-M and NB-IoT
        * * */

      modem.setPreferredMode(1);

I keep getting:

OK
AT+CGREG?
AT+CGREG?

+CGREG: 0,2

What did you connect to eventually?

[brownjug]

well now 2 yrs later I still haven't had success with my 7000G's Is there a process to upgrade the firmware,,, I also got a new computer of late,,, It doesn't want to acknowledge the ADAFRUIT FONA library commands,, "type fona does not name a type"

i will keep searching for solutions!!