Kingdom-tech provide Communication modules 2G,3G LTE range of M2M applications, We offer High Quality Global Standards. All of our modules undergoes an extensive and restrict testing and quality control procedure, ensuring each item on sale meets global quality standards.
Quectel EC21 is a series of LTE category 1 module optimized specially for M2M and IoT applications. It features cost-effective, low power LTE connectivity, and delivers M2M-optimized speeds of 10Mbps downlink and 5Mbps uplink. These make EC21 an ideal solution for numerous IoT applications that are not reliant on high speed connectivity but still require the longevity and reliability of LTE networks.
● Cost-effective, lower-power LTE connectivity optimized for broadband IoT applications
● Worldwide LTE, UMTS/HSPA+ and GSM/GPRS/EDGE coverage
● Multi-constellation GNSS receiver available for applications requiring fast and accurate fixes in any environment
● Feature refinements: supports DFOTA*, eCall*, QuecLocator and DTMF
● MIMO technology meets demands for data rate and link reliability in modem wireless communication systems
B2/ B4/ B12
B2/ B4/ B5
FCC/ PTCRB/ AT&T/ IC/ ROGERS
Q.1:How can I get some samples?
We are honored to offer you samples. Please kindly contact us for more details.
Q.2:What are the main export countries?
Our products are sold worldwide. The main market is in Europe.
Q.3:How does your factory to control the quality?
We are always adhering to the principle that quality is the core from the production to shipping.
Q.4: SIM card cannot be recognized after the module works for a while.
Description: module responds +CPIN: READY after powering on, but after a while, it responds +CPIN: NOT READY. You can analyze the issue from the following aspects.
1) RF interference
a. You can use AT+CFUN=4,1 to disable the RF function and check if the issue still exists.
b. Put the antenna close to the SIM card and SIM card signal line to check if the issue appears more frequently.
c. Please check if there is electrical/magnetic field around the testing field, for example, high voltage transmission lines, high-power wireless devices, etc. Try to use shielding case to cover the SIM card and all the SIM signal lines to confirm if the issue will be resolved.
d. Try to connect the pins of SIM card signal (SIM_DATA/SIM_CLK/SIM_RST/SIM_VDD) to ground via 15~33PF capacitors to eliminate the RF interference.
2) Hardware design issue
If the VBAT trace is too close to the SIM card signal line, module can still recognize the SIM card because of the low ripple of VBAT when powering on. But when module starts to register to the network, the ripple will become higher and interfere the SIM card signal line, which might cause the module not to recognize the SIM card. You can cut off the power supplied to the module and use external power source to directly feed to VBAT pin of module to see if the issue is resolved.
3) Poor quality of SIM card
a. Change another SIM card to see if there is the same problem on the new SIM card.
b. Put the problematic card on the Quectel EVB or cell phone to see if there is the same problem.
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