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Setting Up the PCB
The Tiny4FSK PCB has many configurable operating modes, pins and power sources. This section will outline these parts of the PCB.
The PCB contains two jumpers, JP1 and JP2.
JP1 - Cut (desolder) to enable SW3 for power.
JP2 - Control power source (USB and center for USB mode, center and BATT for battery mode).
There are also two switches/buttons, SW1 and SW2.
SW1 - Reset button for the microcontroller.
SW2 - Battery power switch. Connects battery output to boost converter input.
There are two antenna pads, AE1 is already soldered (GPS antenna). AE2 is the UHF antenna pad.
AE2 - 70cm antenna pad. For a guide to cut a proper antenna, refer to the following section.
This system relies on 70cm (420-450 MHz in the US). There is a pad that supports a quarter-wave monopole, but also provides grounding pads for a more advanced antenna. Generally, a length of magnet wire ~16cm should work just fine.