GM862 GPS Portable

GPS/GNSS Development Boards
1

Hello everyone here,

I have the following hardware :

1)SparkFun Electronics - GM862 Cellular Quad Band Module with GPS

http://www.sparkfun.com/commerce/produc … ts_id=7917

with Firmware version 07.03.400

  1. SparkFun Electronics - GM862 Evaluation Kit - USB

http://www.sparkfun.com/commerce/produc … cts_id=280

I want to make the GPS system portable. I have a high altitude ballon project, and using this GPS system to track where it is.

I know you can power the GM862 evaultion USB Board from the 5-9v dc sockect (PSU i am guessing) no? (or is it both usb and dc socket)?

It says that you can: Communication and power via USB. The USB chip can be disconnected to allow for external control of the TX and RX pins on the GM862 module (3V logic only!). I will not have USB ( or a computer) when the Payload is 30 km in the air, so what do i have to do to make the GM862 GPS module powered and working portably? Can it be done? Thanks. Scott

btw it mentions : Note: Some USB ports cannot source enough current to power the GM862 module. If the power supply is inadequate, the module may shut down while attempting to connect to the cellular network. An external power supply will correct this problem if it is experienced.

Does this effect me usingt he board portably (i.e not connected to a computer) Thanks.

2

You need batteries. I recommend primary lithium cells (not rechargeable) which can work to very low temperatures. The module requires, as stated, 5 to 9V. Three primary lithiums in series will give it enough power.

Note that you will likely not have reliable cellular communication at that altitude. Its more useful to find the balloon after descent.

3

also , seems by law you are not allowed to use GSM in any airbourne application (this is different than using phone in airplane which now some companies allow). i have been told this several times but I am still looking for a reference on it.

4

That will depend on the country. It’s probably illegal here in the UK as is the case with amateur radio transmissions.