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Sim900 Reset Problem

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rmrps

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Hi Friends I am sim900 module to send sms and gprs usage when i am power on the module without inserting simcard its working fine that is no reset. But when i am inserting card its keep on reset for every 5 seconds once i am giving 3.9v for the Vbat pins please help me how to resolve this problem thanks in advance
 

I'm also facing a similar problem. I'm using a TC35 Siemens GSM modem. After the network initializes, the power supply shows that there is a short circuit. (Indicator bulb for short circuit of the power supply switches ON & OFF rapidly) When I remove the SIM it looks fine.
 

It could be because the power supply is not able to provide the required current. What is your transformer/adapter rating? Also add a large value of decoupling capacitor abt 470uf.
 
Increase Battery Capacity by paralleling & also provide cap of 2200 or 4700 uf
 
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    rmrps

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Thanks for the reply friends
 

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