The DXZone.com Amateur Radio Internet Guide

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MFJ-434B DELUXE VOICE KEYER

Posted:
https://www.dxzone.com/mfj-434b-deluxe-voice-keyer

Let this microprocessor controlled MFJ Contest Voice KeyerTM call CQ, send
your call and do contest exchanges for you in your own natural voice!

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TS-590S audio noise

Posted:
https://www.dxzone.com/dx33970/ts-590s-audio-noise.html

Radio Equipment/HF Transceivers/Kenwood TS-590S
With high impedance earphones plugged into the audio jack on the Kenwood
TS-590S or TS-590SG, you can hear a really annoying noise even with the AF
volume set to zero. A simple quick-and-dirty solution is a resistor in
series to the audio output.