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Table of Contents
WAOARC 2025 WSPR Kit Build - Construction Guide
This guide will walk you through putting the WSPR Hat Kit together.
* This guide is currently being edited 
(From Monday 28th July @ 1pm) *
Prerequsites
In your kit, you should have received the items in the table below. Please check you have everything before you begin:
| 1x 20k variable resistor | 1x 47uf 16v Electrolytic Capacitor | 2x 4-pin sockets |
| 1x 47Ω resistor (Yellow Purple Black Gold) | 3x 100nf Capacitor marked BC 104K | 1x 40-pin socket |
| 1x 20KΩ resistor (Red Black Orange Gold) | 1x BS170 transistor | 15cm fine enamelled copper wire |
| 1x 1Ω resistor (Brown Black Gold Gold) | 1x LED (orange diffused) | |
| 1x 15KΩ resistor (Brown Green Orange Gold) | 1x 1N4148 Small Signal Diode, 100 V, 150 mA, 1 V | |
| 1x 270Ω resistor (Red Purple Brown Gold) | 1x Push button momentary switch | |
| 1x 2KΩ resistor (Red Black Red Gold) | 1x FT37-43 Ferrite |
The kit also requires a QRPLabs Low Pass Filter. If one was requested with your kit, it will be included in it's own ziplock bag.
Resistors
Install all the resistors and trimmer variable resistor. The board is marked to assist you.
Tip - Try to have the coloured bands in the same orientation. It looks nice.
| Reference | Component |
|---|---|
| RV1 | 20KΩ Trimmer variable resistor |
| R2 | 47Ω (Yellow Purple Black Gold) |
| R3 | 20KΩ (Red Black Orange Gold) |
| R4 | 1Ω (Brown Black Gold Gold) |
| R5 | 15KΩ (Brown Green Orange Gold) |
| R6 | 270Ω (Red Purple Brown Gold) |
| R7 | 2KΩ (Red Black Red Gold) |
Capacitors
Install the capacitors.
NOTE: C1 is an electrolytic capacitor so the orientation is critical or the magic smoke may escape. Long leg is positive, and short Leg is negative. Match the white band on the capacitor to the white area on the board
Tip - Try to orient the other capacitors so the writing faces the edge of the board and can be easily read.
| Reference | Component |
|---|---|
| C1 | 47uf 16v Electrolytic Capacitor |
| C2, C3, C4 | 100nf Capacitor marked BC 104K |
