pi@raspberrypi:~ $ lsusb Bus 001 Device 005: ID 0403:601f Future Technology Devices International, Ltd Bus 001 Device 004: ID 1546:01a8 U-Blox AG [u-blox 8] Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub pi@raspberrypi:~ $
Soldering is not for beauty contest but I am limited with available R set and old Weller WECP-20 with small tip ;) bit oversized resistors are on angle to reach the pads.
To enable presence of Ublox-M8 GNSS RX on LimeNET USB bus some modification is necessary:
USB Virtual Serial Interface: Connect the USB Differential Data Pins by soldering two 0R resistors to R96 and R97. The location of these resistors is on the top of the unit facilitating a lot the soldering process.
We use => Figure 2. LimeNET-Micro top side components and connectors
Green outlined arrow points to resistors location:
Now, before the modification we have:
pi@raspberrypi:~ $ lsusb Bus 001 Device 006: ID 0403:601f Future Technology Devices International, Ltd Bus 001 Device 005: ID 10c4:eac9 Cygnal Integrated Products, Inc. EFM8UB1 Bootloader Bus 001 Device 004: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub pi@raspberrypi:~ $
After mod, we expect to see another device, something similar to:
Old ICOM PCR-1000 is prepared to be used like preselector for LimeNET. IF 10,7 MHz out
To be able to perform properly, LimeNET must be cooled to keep the board in 45 C range. Here evaluation of extra cooling. Finally only left one over LMS and FPGA chips is used because Ublox-M8 module on right, can be left without extra cooling.
Case is selected from old stock, last use of this Pelican case was on top of the car on magnetic holders use for environment monitoring. Cats are kindly asked to look for another solution ;)
Djani
