With re erence to the above photograph, looking anti-clockwise rom le t:
•GNSS Module: The E108-GN01 GNSS receiver module, multi-satellite system
capable (GPS and Beidou enabled by de ault).
•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 de ault, and connect the signals to the
onboard LEDs. I you wanted to use external LEDs or example in a ront panel, you
would cut the tiny traces under these jumpers (see later section).
•Status LEDs:
◦Power (RED): always lit
◦Serial Data (Yellow): lashes once per second in time with the serial data burst
◦1 PPS (Blinding Green): lashes once per second when a 3D satellite lock is
acquired
•External LED connect: Three LEDs may be connected here using wires i you pre er
external LEDs to the onboard SMD LEDs.
•6-pin inter ace: this provides six pads:
◦GND
◦GNSS 1pps
◦GNSS serial data
◦No connection
◦RxD serial data
◦+5V power supply input
•Option Jumpers: con igure how the serial port pads are connected, allowing either
2.8/3.3V logic or 5V logic levels
•Break-strip: this line o drilled holes allows you to easily snap o the right-hand part
o the board, i you would like a smaller board (53 x 37mm)
•4-pin inter ace: pads or QCX, U3S etc: the standard QRP Labs 4-pin connector:
+5V, Gnd, Serial Data (TxD) and 1PPS. There are two 4-pin connectors, they are
wired in parallel, so that you can use either one depending on whether or not you
break apart the PCB (see above).
•Prototyping areas – the unused space on the PCB is populated by a 0.1-inch pitch
matrix o tinned through-holes where you can add your own components i you need
to.
•Spare AND-gate: one o the our AND gates in the 74AC08 is not used, you can use
it as a bu er i you need to.
•Space or Ultracap: 5mm-spaced pads suitable or installation o an Ultracap or
ephemeris backup purposes; this provides aster hot-start.
The board size is 80 x 37mm, and the holes in the our corners are at exactly the same
positions as on the Ultimate3S, Clock and VFO kits; there ore the board can be stack-
mounted behind these kits on suitable spacers (12 or 25mm).
These eatures will be described in more detail in subsequent sections.
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