There are several prototype versions of the 9BFC in operation, and they work just fine when connected to a decent multiband antenna.

BUT – when connected to a high SWR antenna (as is sometimes necessary in the field) the internal surface mount inductors can get disturbingly warm. The prototype 9BFC used a mix of surface mount and toroid inductors.

So, I am announcing the brand new all-toroid version of the 9BFC!

The 9BFC covers the 80, 40, 30, 20, 17, 15, 12, 10, 10 and 6-meter ham bands. This design has demonstrated its resilience and performance under all load conditions, and so has become the production version of the 9BFC.

So when you want to get a signal out, even when working with too-short or otherwise mismatched antennas, the 9BFC is now available: https://turnislandsystems.com/product/nine-band-filter-combiner/

And of course it works great with a well-tuned multiband antenna!

It’s alive!!! The new WSPRSONDE v2 WSPR/FST4W multichannel transmitters are rolling off the Turn Island Systems assembly line:

There are a few changes from the previous batch of WSPRSONDEs:

• Smaller chassis, customized for Turn Island Systems.

• Software control of output power: 1W or 250mW

There are a few other minor changes on the circuit board — things like Board Revision ID, allowing for future forward and backward compatibility.

But the WS-v2 is otherwise identical to the units that have been deployed on at least 2-1/2 continents. It continues to generate the clean, precise, and stable signals so necessary for accurate measurement of ionospheric propagation effects.

Along with this new hardware release comes updated WS firmware, with new features and options.

This has been in the works for a while now, and I am very pleased with the finished product!

If you are interested in some details of the WS-v2 assembly process, here is a short video of the Turn Island Systems CNC mill preparing a blank aluminum faceplate for the WS.