Introduction - microHAM microKEYER Manual

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3 – INTRODUCTION
microKEYER ("MK") is an all mode computer to transceiver interface.
The computer is connected to MK using three (3) standard audio cables and one A-B USB cable.
The transceiver and MK are connected by a single radio cable terminated on one side by a DB37M and on
the other side by plugs appropriate for the specific transceiver. The cable carries power for MK, audio, CAT
control and keying. A second cable from the DB37 connects to the transceiver's microphone jack.
The remaining connectors on the rear panel of the MK support optional accessories like foot switch, paddle,
microphone, and keypad.
MK works with or without a computer. Switching between modes is fully automatic.
If a computer is not connected or not running MK uses customizable "power up" settings. In this mode MK
functions as a CW memory keyer with a PS/2 keypad, drives all PTT outputs and provides a PTT
sequencer controlled by the foot switch or microphone PTT. With an external PS/2 style keyboard MK also
provides keyboard generated CW and RTTY.
If a Windows PC running the "microHAM USB Device Router" program is connected, MK also functions as
a computer interface. It transfers all digital and analog signals generated by computer applications between
the computer and transceiver. Software compatibility is insured by using virtual serial ports. Router
continuously monitors these virtual ports and transfers the data by USB to the MK. MK processes this data
and sends it to the physical ports of transceiver as CAT, CW, FSK, and PTT functions.
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