It has two PC (3mm stereo) connectors so you can plug into your KX3 and your PC (you don’t need the PC if you have KX3 in AI (auto info) mode). The KX3 band decoder fits inside of a 3″ by 6″ by 1″ box. Owners manual here and Theory of Operations here It uses the same band signal drivers and coding as the K3 and shows up on the same exact pins! This allows you to connect any of your ham equipment that you can use with a K3 band selection data to the KX3! It sniffs your KX3 serial PC connection for band information and generates the band signals found on the 15 pin K3 ACC connector. Well you can! I designed a KX3 Band decoder package. 100 general-purpose memories store VFOs, modes, etc.Are you a KX3 owner? Ever wished you could squeeze band info out of your KX3 like you can on the K3? Control big amplifiers, automatic antenna tuners, band switches?.Built in digital voice recorder (DVR) with two message buffers.8 band equalizer tailors passband to your voice and microphone.DSP RF speech processing for excellent 'punch'.Fast, silent, PIN-diode T-R switching - no relays.Switchable PA output impedance for efficient 5-W or 10-W use.Optional attached keyer paddle with spacing adjustment.Optional MH3 microphone with PTT and UP/DOWN functions.Rugged, SWR and temperature-protected final amplifier stage.Built-in speaker stereo jack for headphones/external speakers.Center-tuning indicator for CW and data modes.Automatic and manual notch filtering adjustable noise reduction and noise blanking binaural audio effects for enhanced receive.Easy-to-use PassBand Tuning (PBT) for shift/width/hicut/locut roofing filters automatically track DSP filter settings.Dual watch over +/- 15 kHz range uses applicable roofing filter.Dual roofing filter option for enhanced dynamic range.Receiver I/Q outputs for use with PC soundcard.Quadrature down-sampling mixer compatible with PC-based SDR (software defined radio) applications.Firmware updateable via provided application software.Low-noise synthesizer with 1-Hz tuning resolution.
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