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January 26, 2007
about 3 years ago
I checked the Eagle files. This module is using a grounded co-planar wave guide but “S” (the spacing between the signal trace and the top-layer ground) is 12 mil instead of 10. This works out to an impedance of 52.8 Ohms. It would have been better if the spacing was 10 mil, but still a LOT better than 70 - 80 Ohms!
about 3 years ago
It looks to me that the module uses a grounded coplanar wave guide and not a microstrip. If you re-run your calculation with a 50 mil trace and 10 mil clearance between signal trace and ground you should get approximately 50 ohms. http://i.imgur.com/sEpKPAK.png
about 5 years ago
I believe there is an error with the board. Pin 3 (RTS#) of the FT232RL (Output) is connected to pin 37 (RTS0) of the ADH8066 (also an Output). Shouldn’t it be like this:
FTDI 11 (CTS#) to ADH 37 (RTS0)
FTDI 3 (RTS#) to ADH 34 (CTS0)
And I think
FTDI 2 (DTR#) to ADH 35 (DSR0)
Has anyone gotten hardware flow control to work on this board? Honestly the data sheet is terrible. I am considering a different module.
about 6 years ago
Ok, using a combination of cloverm, and jayk (for the APN settings) I was able to get this module working with AT&T GO Phone ($25 for 3 months!?!?! NOT BAD! Also I consider $0.01/KB not too bad for low data rate applications) What I learned is that the orange/white SIM cards that come with GO phones are junk. Just purchase one of the orange/white/blue 4G sim cards on ebay and call AT&T and activate it as a GO Phone. Internet worked flawlessly and I was able to download google’s webpage as demonstrated in cloverm’s post.
P.S. I used the “Simple Rate Plan” and added $25 which is good for 90 days. $100 will get you a year and ~9.54 MiB. Perfect for weather-station like applications.
Are you using the breakout board provided by sparkfun? If so would you mind giving a step-by-step procedure for updating the firmware?
Am I understanding this correctly… you applies RS-232 level signals directly to the cellular module? It seems like would exceed (by a large margin) the voltage tolerance on the UART.
I am using the breakout from sparkfun. I haven’t dared trying to update the firmware on this one.
Yes, I too had a problem. My module was crashing (and resetting) using a GO Phone SIM from AT&T. I contacted the manufacturer and they thought it was an outdated firmware so they sent me the most recent version. It failed while flashing and effectively bricked the module. The manufacturer thought it was probably a defective flash chip.
I would be interested to hear if anyone has successfully updated their flash.
No public wish lists :(
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