DX Audioįor DX and other weak signal work, the emphasis is to concentrate most of the transmitted energy at audio frequencies that enhance intelligibility in low signal-to-noise conditions. Some of the better desk mics do provide limited audio adjustment capabilities, such as a switch for enhanced treble (DX) or flat response (rag-chew) settings. They usually include filtering of both high and low frequencies, again, to provide a clean but generic-sounding audio. But doing so is usually disappointing, because such mics are usually very little better sounding than the stock hand mic. To sound more distinctive, manufacturers hope you will purchase one of their expensive desk mics. It is designed to be good enough for any mode of operation, while excelling at none. The sound of stock audio is bland and unimpressive. This response produces a clean RF output and helps manufacturers pass spectral purity tests needed for FCC Type Acceptance. It is typically peaked at mid-range frequencies, rolling off on both high and low ends. This is the default, new-out-of-the-box hand-mic audio designed and provided by ham radio manufacturers. Generally speaking, there are four types of audio on ham radio. At minimum, this requires a mic equalizer and a good vocal microphone. The purpose of this article is not to fully explore the subject of high-fidelity audio on Amateur radio, but rather to provide an example of how to significantly improve your transmitted audio without breaking the bank. Radio manufacturers have finally started adding audio processing to some models, ranging from basic bass & treble controls (Icoms) to parametric equalizers (some Yaesus). In recent years, some Amateurs have expanded the hobby by taking an interest in more sophisticated audio systems using broadcast-type audio equipment such as studio microphones and various audio processors. With most voice communications being single sideband (SSB), and restricted to a 3 kHz bandwidth, fidelity has always been, well, about like a land-line telephone. Home » Ham Radio » 2018 Projects » Boom Mic and EqualizerĪmateur radio is generally not known for high fidelity audio.
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