SARC WSPR TX Project
The club was looking for a construction project for 2017 ideally for everyone to build either at the club or with assistance that would be of general interest and supplied in the form of a kit suitable for novice builders. There are no surface mount components so soldering should not be problem. 2 projects came to the top of the list and the first was the WSPR Transmitter.
The kit will enable you to construct a WSPR Transmitter capable of running a maximum of 20mW on all bands from 1.8 - 14 Mhz on the specified WSPR frequencies. The software is provided on a PIC chip which has been be pre-programmed using Proton BASIC with the users callsign and locator. This is a restriction as the BASIC compiler is a licensed product and only 1 club member has the software. The actual code will be published but the club will not provide programming services to non-club members. All the components others than a case, the chassis mount components and power supply are supplied. Construction should only take a few hours with the most effort to build the kit into a case.
The kit uses several pre-built modules which can easily be acquired for a nominal price from eBay. These are
NEO GPS module for accurate timing which are commonly used with drones
DDS AD9850 module to generate the required frequencies.
The display is also a module consisting of the LCD 1602 (16 characters x 2 lines).
The construction notes: WSPR TX Build Instructions v0.7 to download.: Last update on 5th August 2017.
The construction notes WSPR TX Build Instructions v0.8 to download: Updated on 16th September 2017 with v2 software information.