Geeetech

Hi,

Alright, thanks for your answer . I'll try to keep the trace as short as possible.


Have a nice day,

Best Regards,
Bebe-Cosmin Briceag

Hi,

I'm afraid I don't understand what you say.Are you talking about the antenna itself or about the connection between the sim900 module and the antenna?
So,this the schematic of the sim900 module:


.......1..2..3.....
| SIM900 |
| |
|..................|

Let's say this is the schematic, where ...

Hello,

Thanks for your reply.
Do you mean the RF_ANT pin must be bound to GND?If yes, what is the real signal?


Best Regards,
Bebe-Cosmin Briceag

Hello everyone,

I've encountered the same problem as you .More exactly,I've designed a PCB for my diploma project which involves a GSM module . The design is according to the GSM datasheet. Besides the problem with the network registration, there is a short between the RF_ANT pin and the ground ...