Description

I didn’t want to offer this product since it takes a lot of time and effort, but it just makes so much sense that I finally gave in.  So here it is:  The Nine-Band Filter-Combiner.

This allows the WSPRSONDE or any other QRP transmitters to simultaneously transmit into a multiband antenna.  The frequencies supported are the 80, 40, 30, 20, 17, 15, 12, 10, and 6-meter ham bands.  Due to the hand-wound and hand-tuned toroid inductors this is not an inexpensive unit, but it certainly beats the cost and effort of erecting individual antennas!

User’s guide: https://turnislandsystems.com/wp-content/uploads/2025/01/9BFC-Manual.pdf