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today I receive my Rock PI4 A 4GB. PD : was 2019/03 orderd from allknow.de.
Im wondering of the PCB version I found No description or a new schematic for version 1.4.
Has any body informations to this version and by the way I see two ram with 512MBx32Bit for the 4 GB version ??
Is this right?
The other 3 GB placed on the SOC ?
I would be glad to hear something to that version.
BR
Rene
The ram is on the other side?
They Seemed to have fixed the 3.5mm Audio issue on the 1.4 version … its now got a metal ring and is soldered instead of glued …
That is 4gb by the look of it.
512mb*32/8=2gb
Many thank you for the helpful answers.
BR
Rene:+1:
I also got this 1.4 version.
Here it says that this new version has external Wifi/BT antenna support.
However I cannot see the entraces for the antennas in your pics, do you what they mean with this “support”?
Thanks!
ok so I studied the pics more deeper and I think I found what they mean
here I think is the place where you will be able to solder the external antenna connector
Yes, by default the antenna is routed to on board antenna, but we can also solder an U.FL connector and change the orientation of C3/C4(sharing one pad) to U.FL connector.
Check page 22 of the sch:
https://dl.radxa.com/rockpi4/docs/hw/rockpi4/rockpi4_v13_sch_20181112.pdf
Thanks for the attention, it’s the same procedure for the Rasp Pi Zero. To me it’s only scary to mess with these smd components lol
Its ipex male not sma ? from the pcb that is?
All refer to micro RF coaxial connectors for 0-6Ghz applications based on the Hirose U.FL-series design.
U.FL = U.FL series from Hirose Electric Group
Specs: hirose.com/product/en/products/U.FL/
IPEX = MHF series from I-PEX Connectors
Specs: i-pex.com/Products/Micro-RF-Coax-Connector
Ya got me on IPAX…
IPX = IPX series from LightHorse Technologies
Specs: rfconnector.com/ipx-connectors.php
AMC = Amphenol Micro Coaxial connector series from Amphenol RF
Specs: amphenolrf.com/connectors/amc.html
MHF = MHF series from I-PEX Connectors
Specs: i-pex.com/Products/Micro-RF-Coax-Connector
UMCC = Ultraminiature Coax Connector and Cable Assembly Style A Series from Tyco Electronics
I always call them sma but actually they are bigger and different.
I didn’t know there were so many types of connectors. Although, if it is based on the Raspberry Pi Zero W, it is a U.FL connector.
The above are all the same its sma are different there isn’t really a standard just manufactures series names.
The above are all UFL/Ipex which is all you need to search for.
If you click on the links you will notice they are near as damn it identical.
so that picture is very confusing. Can you explain which caps go where more clear? Thanks!
Edit
Figured it out
