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RPi3/Raspbian + SIM5320A AT commands working but no GPS data
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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by tfreid62 on Fri Aug 11, 2017 4:20 pm

Well thanks but the fact that I am a pack rat and have the bag with the Adafruit product number puts me at an advantage on the quest for truth.
I told support when this started, that a "kit" containing the SIM5320A "without" all the necessary cables was not fitting to my idea of a "kit".
(i.e. I had to buy the GPS coax converter separately)

Now it sounds like the kit contents is traveling further away from sanity.
If you would make me a recommendation for a working combination, say the SIM808 with an onboard coax and a recommended antenna product number, I would be happy to place my order and be done with this thread.

I really appreciate your responses leading us to a solution.
Attachments
adafruit-gps-bag.png
adafruit-gps-bag.png (508.9 KiB) Viewed 104 times

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by adafruit2 on Fri Aug 11, 2017 4:26 pm

ok yah thats an active antenna! did you try 'bridging' the jumper on the SIM53 that says "bias"?

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by tfreid62 on Fri Aug 11, 2017 4:39 pm

I see where "bias" is printed next to two gold contacts, which is next to the GPS antenna connector port.
Do you have any suggestion as to the best way to do that? Not something you can just put a jumper connection on easily.

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by adafruit2 on Fri Aug 11, 2017 4:51 pm

use solder + iron

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by tfreid62 on Fri Aug 11, 2017 7:26 pm

Well here are my conclusions:

1) I'm decent at soldering but the clearance in that location is poor
2) manufacturer design and documentation of this jumper feature does not leave me with a solution
3) I tried manually bridging and I don't get any more output than I was, in fact I get less, see below

I've spent more than ample time giving this hardware a shot. I will order another board with hopes it is a better solution than this.
Again I appreciate your responses.

Code: Select all | TOGGLE FULL SIZE
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
at+c$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
gpsinfocfg=0
OK
at+cgpsinfo
+CGPSINFO:,,,,,,,,

AmpI/AmpQ: 0/0

OK
at+cgpsinfocfg=5,10
OK
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by adafruit2 on Fri Aug 11, 2017 7:55 pm

hmm yeah thats worse. ok you can try removing the solder with wick or a solder sucker. then try sticking the antenna out your window overnight

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by tfreid62 on Fri Aug 11, 2017 8:07 pm

You missed my point, I made an attempt to solder but it's so small and has nothing to secure the metal in place while it is being soldered. I made a make shift device to hold the iron and still I could not get it soldered.

I have the antenna out the window and sitting on the railing of my front porch. From this location, previous posts on this thread have shown that the antenna is seeing 16 different satellites without the bridge apparatus.

I am looking for recommendations for a new board that uses an active antenna such as the one I have, has a coax connector that this antenna plugs right in to (without the uFL to SMA adapter), and the board is set up for the active antenna with no bridging.

Let me know if you have any suggested configs.

Thanks!

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by adafruit2 on Sat Aug 12, 2017 2:48 pm

hmm a PCB vise can help you, and a screwdriver tip - without that solder ball you may not be biasing the antenna well and not enough signal getting through! maybe its seeing the satellites but not getting the data consistantly? if 2 are acting the same, getting another one of the same module wont help :)

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Re: RPi3/Raspbian + SIM5320A AT commands working but no GPS

by tfreid62 on Mon Aug 14, 2017 1:04 pm

Yes I have tried a screw driver in a vise, holding it in place by hand, and nothing seems to have an effect.

The prevailing point is the fact that I have learned a lot from this, and based on our project goals, the uFL connector and the solder jumper of the SIM5320A are not the best working options for this step in my project. I need it to be mobile and stable. I found a SIM808 that has all SMA antenna connectors, and operates with 2G/3G/4G SIM cards.

I will get a smaller soldering gun and solder sucker to see if I can get the SIM5320A to work. My suggestion would be for the manufacturer to create standard jumper posts to achieve a jumper for the active/passive antenna connection(s) on future models.

Thank you for your support.

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Please be positive and constructive with your questions and comments.