Add-on card for WSPR transmitter gives four band capability

Hi all.
I just released an expansion card to my WSPR-TX_LP1 transmitter.
It expands the transmitter with four switched low pass filters.
With this combo the transmitter forms a standalone WSPR transmitter with on-board GPS that can do band hopping on four or more bands.
It is possible the lowest cost multiband WSPR transmitter available today. And it's Arduino based with open source.
I hope you find it interesting.

More info on my blog https://www.zachtek.com/single-post/2019/01/16/Add-on-for-the-WSPR-TXLP1...

73
//Harry -SM7PNV