A recent hamfest yielded an interesting stand-alone DSP-599ZX by Timewave.? Coupled with the V6 I was amazed at how much it cleans up the audio.? Sadly, the uBitX draws about 0.29A on receive and the darn filter 0.79A, so it will be demanding on battery ops.

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I’m using the earphone output to inject into the filter and running the output of the filter to a small JBL portable speaker—eliminating the annoying hiss generated by the LM386 in the radio and replacing it with a high-quality speaker.? I may figure out a Bluetooth connection with a dongle in the uBitX configured to automatically connect to the speaker and eliminate another cord from the operating position.

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Are others using this (or similar) filter setup with their uBitX?? Some pointers would be helpful to me.

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If I understand the documents correctly, there are four modes.? SSB/CW/Digital/Bypass.? Three knobs.? High pass cut-off, low pass cut-off, and gain.?

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The SSB mode is a traditional bandpass set up where you set the skirts of the bandpass.? One button strips out heterodynes 100%.? Amazing really how perfect it is at stripping out a spur without changing the audio unchanged.? The AGC is somewhat of a mystery to me as activating it actually increases the noise level.? Another button reduces random hiss noise and it has considerable effect on clarity.

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CW mode you set the center frequency and the bandwidth using the frequency knobs.

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I’m hoping to find help with Digital mode.? It is set up to basically detect a RTTY signal with 170 Hz preset.? The setup looks complex with two 6 pin DIN connectors involved with the various signals used with RTTY.? Do people still use RTTY?? Is the uBitX being used for packet or PSK or ???

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The notion of the DSP decoding an incoming signal and regenerating the audio is fascinating to me.? FLdigi may be the way to go but I’d be interested in hearing from others as to how they use their uBitX in digital modes, what equipment they use, etc.

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Ford-N0FP

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