2 questions:
As I look at the board, the reeds on the sides are not grounded. Any reason why not? Telit specifications state that they have to be grounded…
Beginners question. What’s the easiest way for connecting wires from the breadboard to the small holes? How is this cleverly connected without soldering?
Joris
From the picture it looks like at least one of the shielding reeds goes to a large ground plane which is connected to the bottom 2 ground pins. I wouldn’t worry about it. If you think you’re having issues with RFI, maybe just make sure one of those ground pins is also connected to your main ground.
The best thing to do is to solder on some break away headers (search the store for these: you can get male and plug right into a breadboard, or get female and make the connections with jumper wires). If you really want to do it totally solderless try searching around for “test hooks” or “test leads.” They’re little hooks with a spring-loaded plastic shroud and have flying leads or banana plugs on the other end.
I have tested it now, they are indeed grounded. Just curious how do you “see” that when I dont see any connections on top or bottom layer?
OK thanks.
Hi,
Just got my new board, but I’m having some issues with it, and I’m wondering if anyone has experienced something similar. Turning the device on, I’m able to communicate with the modem using AT commands, but about a minute after power up, the modem shuts itself off for no apparent reason, accompanied by a brief flicker of the usb tx led. Any insight would be greatly appreciated.
-Matt
Is there a 100 uF capacitor across the GM862 supply pins? There is a large current surge when it starts to transmit which can shut it down if the capacitor is not present.
Leon
classical problem, make sure it has low-esr.