05-03-2021, 08:25 PM
(05-03-2021, 07:52 PM)GregH Wrote: Ahh, I just made a terrible error.
I tried to remove the antenna springs in order to solder direct to the PCB. Bad idea!! I've managed to destroy the solder pads, and I can't see any material to solder to now. So I've gone from woeful GPS to absolutely no GPS. :-(
Best to use the spring contacts than to remove them. The MHF u.fl connectors sounds like a good idea.
Any chance the tiny connector near the LTE coax connector is GPS? It's not u.fl but something even smaller. Pity, since I don't have any connectors that small or I'd try it.
Damn, that sucks. I believe the cluster of small pads below the spring connectors is connected to the antenna. On page 15 https://files.pine64.org/doc/PinePhone/P...ematic.pdf search for ANT1501 and you will see the section that leads to the antenna pads. There is a 0ohm resistor connecting pads C1519 and C0201. You can connect to the GNSS feed there.
But that cluster might be for the WiFi, it has a similar setup in the schematics. Need to test if it is connected to the GNSS pad. Will have to do that with a DMM at work tomorrow.
Another possibility, I think both the Braveheart and UBports have the pads around the EG25 module exposed. https://pine64.com/wp-content/uploads/20...46c16e2e66
The link on the wiki for the EG25 module PDF is broken, but it had the pinout for which pad is the GNSS antenna, it has a ground pin right next to it. Originally I was planning to solder to those pads, but the 1.2 PCB does not have the exposed pads.
That connector by the cell connector is some kind of switch. Search for J1500 on page 15 of the schematics.