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.  

G4NAQ WSPR

 

WSPR TX Kit

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

NE06M GPS

DDS AD9850 module to generate the required frequencies.

DDS AD9850

The display is also a module consisting of the LCD 1602 (16 characters x 2 lines). 

1602 LCD

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.

Working Models 

G4DVV WSPRM0HWQ WSPRG4GTD WSPRG4NAQ WSPR