msVOXPTT Kit

Completely self-powered from your Modem/Audio source.
Practical size: Fits in Small Altoids tin or inside trailing-edge radio chassis, for a good, inexpensive, dedicated data radio.
Cross-Platform compatibility.
250mVrms or higher level Audio for PTT can come from: TNC, computer, smart phone (New or Old), Raspberry [Pi], Arduino, USB Soundcard.
Consistant Latency - Once level is set,T/R latency remains constant by mode, generally less than 80ms.
Open-Collector keying from the Mighty and Venerable SMT version of the 2N4401.
Pads to set levels and equalization allows maximum flexibility for your unique individual setup.
Hum Protection - Not made for less than 240Hz modulating frequency. 60Hz hum must exceed 300mv to key TX (6dB in excess of 240Hz or higher frequency drive signal)
No more rude 3 second preamble and long hang time, using radio/rig VOX.
No more Windows Updates interfering with USB to RS232, emulation freezing, or variable latency in PTT keying.
Audio/soundcard modem generates signal.
Does not depend on layers of computer code to execute properly and in time.