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Query: audio test
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  • Building a Multi-Output RF Field Strength Meter
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    Technical Reference > Test Equipment > RF Probe
    Building a Multi-Output RF Field Strength Meter — KM1NDY
    This article describes a DIY RF field strength meter project inspired by VK3YE's "The Squeakie" design. The device, built around a 555 timer IC and a 1N4148 diode, converts RF signal strength into audible tones with proportional pitch. The author enhanced the original design by adding volume control, LED indication, and digital readout capabilities using an Arduino Nano and LCD display. The completed project functions as a versatile RF detection tool, suitable for antenna testing and fox hunting, while offering multiple output methods: audio, visual, and digital measurement display.
  • YAESU FT-991 Recording contest QSO
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    Radio Equipment > HF Transceivers > Yaesu FT-991
    YAESU FT-991 Recording contest QSO — HB9AMO
    How to record the full contest audio into .mp3 file(s). t is possible to record the receiver's audio through the USB sound card in the radio (USB Audio CODEC), but only the transmitted SSB audio can be recorded, unfortunately not the CW.