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Using a noise source and a QA400 audio analyser we tested the filters in an FT-817.Stock Ceramic SSB filter: surprising poor skirt selectivity. Probably the result of insufficient isolation between th … read more

In the lab we have an FT897 that we use for testing speech compressors. While it is largely similar to the FT817 (apart from the higher power) it does have audio DSP filtering. I wondered how this mig … read more

When I tuned to 80m last night I discovered that there was a contest in full flow. It seemed like a good opportunity to show the difference between a basic noise reduction system and WOLFWAVE … read more

I have long been a fan of the Rockmite, Dave Benson's simple transceiver. It's one of the only minimalist designs that is actually useable. However, with all these simple radios, selectivity (the … read more

Dish Antenna Design for Es'Hail 2 - some thoughtsThe new Es'hail2 satellite with its amateur radio transponder has resulted in a rush of people getting gear to use it. Pretty much an essential item is … read more