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WSPR-TX Mini Transmitter (Needs components, read text)
VK4PK - The Zachtek WSPR Transmitter
And The Meek (Signal) Shall Inherit The Earth: Testing Propagation With WSPR & FT8 – KM1NDY
Ultimate3S QRSS/WSPR kit
WSPR Desktop transmitter
A Little WSPR Beacon (Aren't They All Little?) – Dave Richards AA7EE
ZachTek WSPR Transmitter - Overview - Pretty Cool.
WSPR Desktop transmitter from ZachTek on Tindie
ZachTek WSPR Transmitter Setup 1 (Quick Setup)
WSPR-TX Mini Transmitter (Needs components, read text)
marxy's musing on technology: ZachTek WSPR transmitter
WSPR Desktop Transmitter
The WSPR Desktop transmitter is a standalone WSPR transmitter with built-in GPS for the amateur radio experimenter.
WSPR Desktop transmitter
WSPR Desktop Transmitter 80m to 10m - Version 2