ATK-SIM900A-V13, no signal
Posted: Tue Sep 23, 2014 9:20 pm
I just received a new ATK-SIM900A unit and have been unable to get it to join any carrier network. I am experienced SIM900A user.
M
y setup:
* ATK-SIM900A-V13
* External 6V DC 2.0A power supply
* T-mobile or AT&T unlocked SIM. Both work in SIM900 based Arduino shield or in phone
I have set up fixed baud rate and boot tracing, this is what I get after DC
power is applied and then pressing the PWRKEY about 10 seconds later:
RDY
+CFUN: 1
+CPIN: READY
+PACSP: 1
+CREG: 2
+CREG: 0
The Net light is blinking red. In looking for the issue I found that I am not receiving any signal:
AT
OK
AT+CSQ
+CSQ: 0,0
I usually receive a good signal where I am. I have checked other SIM900A boards at the same time and they are OK.
I tried to eliminate the antenna by using a similar one from another SIM900 Arduino shield and received the same result.
I believe I have the latest Firmware in the SIM900A. It is the Firmware
that is in the unit when you shipped it:
AT+GSV
SIMCOM_Ltd
SIMCOM_SIM900A
Revision:1137B11SIM900A64_ST
Is this just a bad unit?
M
y setup:
* ATK-SIM900A-V13
* External 6V DC 2.0A power supply
* T-mobile or AT&T unlocked SIM. Both work in SIM900 based Arduino shield or in phone
I have set up fixed baud rate and boot tracing, this is what I get after DC
power is applied and then pressing the PWRKEY about 10 seconds later:
RDY
+CFUN: 1
+CPIN: READY
+PACSP: 1
+CREG: 2
+CREG: 0
The Net light is blinking red. In looking for the issue I found that I am not receiving any signal:
AT
OK
AT+CSQ
+CSQ: 0,0
I usually receive a good signal where I am. I have checked other SIM900A boards at the same time and they are OK.
I tried to eliminate the antenna by using a similar one from another SIM900 Arduino shield and received the same result.
I believe I have the latest Firmware in the SIM900A. It is the Firmware
that is in the unit when you shipped it:
AT+GSV
SIMCOM_Ltd
SIMCOM_SIM900A
Revision:1137B11SIM900A64_ST
Is this just a bad unit?