This "The RFzero™ board is an Arduino compatible GPS based Si5351A RF signal source" looks pretty cool: http://www.rfzero.net/
Cost is ~£60, so not bad.
www.rfzero.netRFzero™ – where it all starts
@m0puh Wow! very nice! I am hoping to play with WSPR soon..
@vu3rdd might be worth a look then!
There’s also https://github.com/JamesP6000/WsprryPi which lets you use a Pi with almost no external hardware (I’ve tried it but my antenna wasn’t good enough for any spots with the tiny output power).
GitHubGitHub - JamesP6000/WsprryPi: Raspberry Pi WSPR transmitter using NTP based frequency calibrationRaspberry Pi WSPR transmitter using NTP based frequency calibration - GitHub - JamesP6000/WsprryPi: Raspberry Pi WSPR transmitter using NTP based frequency calibration
@m0puh I saw that project and was planning to use it. I am guessing, we will need to use a low pass filter before feeding the signals into the antenna and that's about it?
@vu3rdd yep! I used GQRP values on an OSHpark PCB I found on github. I should try it again really.