With reference to the above photograph, looking anti-clockwise from left:
•
GNSS Module: The E108-GN01 GNSS receiver module, multi-satellite system
capable (GPS and Beidou enabled by default).
•
Antenna SMA Connector (supplier): Can be board edge-mounted or at 90-degrees
standing up on the board (
DO refer to important assembly instructions later
).
•
LED enable jumpers: these are wired by default, and connect the signals to the
onboard LEDs. If you wanted to use external LEDs for example in a front panel, you
would cut the tiny traces under these jumpers (see later section).
•
Status LEDs:
◦
Power (RED): always lit
◦
Serial Data (Yellow): flashes once per second in time with the serial data burst
◦
1 PPS (Blinding Green): flashes once per second when a 3D satellite lock is
acquired
•
External LED connect: Three LEDs may be connected here using wires if you prefer
external LEDs to the onboard SMD LEDs.
•
6-pin interface: this provides six pads:
◦
GND
◦
GNSS 1pps
◦
GNSS serial data
◦
TxD serial data (for USB to Serial converter)
◦
RxD serial data (for USB to Serial converter)
◦
+5V
•
Option Jumpers: configure how the six serial port pads are connected, allowing
either 2.8/3.3V logic or 5V logic levels
•
USB (4 positions): a Type B USB connector is supplied, suitable for a standard USB
A – B cable. It can be installed either facing to the right side of the board, or facing
the bottom side of the board. Additionally there are pads for a micro-USB connector
if you should happen to prefer that.
•
4-pin interface: pads for QCX, U3S etc: the standard QRP Labs 4-pin connector:
+5V, Gnd, Serial Data (TxD) and 1PPS
•
LCD Contrast trimmer: When installing the optional 1602 alphanumeric LCD module,
a 22K trimmer potentiometer is fitted here to permit contrast adjustment
•
Config jumpers: these are read by the microcontroller at power-up, and determine
configuration options such as baud rate; they can also be used to enter the
bootloader (firmware update) mode
•
LCD Port: The pinout is in the exact same position as on the QRP Labs Ultimate3S,
Clock or VFO kits; a standard 1602 alphanumeric LCD module can be bolted onto
the board here, using 16-pin male/female pin header connectors, 12mm plastic hex
spacers and eight M3 6mm plastic screws (as on the aforementioned QRP Labs
kits).
•
Space for Ultracap: 5mm-spaced pads suitable for installation of an Ultracap for
ephemeris backup purposes; this provides faster hot-start.
The board size is 80 x 37mm, and the holes in the four corners are at exactly the same
positions as on the Ultimate3S, Clock and VFO kits; therefore the board can be stack-
mounted behind these kits on suitable spacers (12 or 25mm).
These features will be described in more detail in subsequent sections.
QLG2 manual for firmware 1.00a
4
