Receive filters are the single most powerful tool for pulling a signal out of a noisy band - but only if you understand what they are actually doing. This episode covers the fundamentals of digital filters, passband width and shape, high and low cut controls, notch filters, and the audio peaking filter for CW.

FT8 is often the easiest path to a first HF contact - no microphone nerves, no real-time conversation pressure. This episode covers the full transmit setup: audio routing from WSJT-X through AetherSDR, CAT control, the FT8 contact workflow from first call to logged QSO.

Every HF operator remembers their first contact. This episode walks through exactly how a voice QSO works - the structure of a contact from first call to signed off, how to call CQ, what to say when someone responds, the standard exchange, and the unwritten rules that make the bands work.

Before you key up for the first time there are a handful of things to check and configure - and doing them in the right order saves a lot of frustration. This episode is the pre-transmit checklist: microphone selection and level setting, PTT options in AetherSDR, how to set your power level correctly, and how to verify your audio is clean before you ever put a signal on the air.

FT8 has transformed HF amateur radio over the last decade - it is now the dominant mode on most bands. This episode explains what FT8 actually is, how it works, what it looks like on the waterfall, and how to set up WSJT-X alongside AetherSDR for decode-only reception. Plus WSPR, PSKReporter, and how to use digital mode decodes as a real-time propagation map.

SSB voice is the dominant mode for human conversation on HF, but it sounds wrong until you tune it correctly. This episode covers upper and lower sideband, why the convention exists, how to tune a voice signal by ear, and how to use AetherSDR's mode and bandwidth controls to receive voice clearly.

Not all HF bands behave the same way. Some come alive at night, some peak at noon, some only open during high solar activity. This episode is a practical band-by-band tour of the amateur HF spectrum - what each band is used for, when to listen, and where to point your attention when you are just getting started.

The waterfall is the defining feature of software-defined radio. This episode covers how to read it: what strong and weak signals look like, how to tell a voice signal from a digital mode from a CW transmission just by its shape, and how to use the waterfall as a real-time window into propagation conditions.

The waterfall is the defining feature of software-defined radio. This episode covers how to read it: what strong and weak signals look like, how to tell a voice signal from a digital mode from a CW transmission just by its shape, and how to use the waterfall as a real-time window into propagation conditions.

AetherSDR is a free, open-source client for FlexRadio transceivers that runs natively on Linux, macOS, and Windows. This episode covers what it is, why it exists, how to download and install it on each platform, and how to start it up and connect it to your radio for the first time.