Monthly Archives: June 2025

FST4W, New Stuff, RX-888, SDR, WSPR

New Filter and Filter-Preamp – designed for six-meter operation

This is a new filter, designed for use with preamplified “probe” antennas, and many other receive antenna systems. This includes a bypassable low-frequency shelf filter, and can be jumper-configured for either 30 or 60 MHz low-pass anti-alias filtering.

See more details here: https://turnislandsystems.com/product/f3060-filter-shelf-30-60-mhz-lpf/

And a new 60 MHz Filter-Preamp:

This one has an aggressive low-pass filter, optimized to eliminate 88-108 MHz FM broadcast band signals before they can cause trouble. The high dynamic range preamp provides about +20 dB of low-noise gain.

Details here: https://turnislandsystems.com/product/60-mhz-filter-preamp/

BeaconBlaster, FST4W, WSPR, WSPRSONDE

Host a HamSCI WSPRSONDE? — also, Turn Island Systems in QST!

Here is an opportunity to help in the exciting field of ionospheric propagation and other “space weather” research, by hosting a WSPRSONDE system provided by the HamSCI organization. HamSci is looking for a few good sites in North America for these WSPR / FST4W research transmitters. There are already about a dozen of these situated in various locations and HamSCI is looking forward to filling in some of the gaps.

The HamSCI package will include the WSPRSONDE, a 9-Band Filter-Combiner, a Bodnar GPSDO, an 80-10 meter end-fed halfwave antenna, power supplies, and all necessary cabling. You will provide a good home for this gear.

If you are interested, visit the HamSCI website for this project:

https://hamsci.org/wsprsonde-psws-transmitter

Turn Island Systems in QST!

(Well, one of our Filter-Combiners is in a group photo anyway…)

The July 2025 issue of QST contains a great article about reducing the noise from local sources and optimizing WSPR reception, written by Conrad Trautmann (N2YCH) . Conrad is a friend, and a regular contributor to the wsprdaemon community. The TIS Filter-Combiner is shown among a collection of WSPR gear.