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microKEYER II uses an advanced, custom USB audio subsystem which allows Router to handle all of the
audio routing. Microphone and receive audio are always connected to microHAM CODEC (the
microKEYER II "sound card").
On transmit, the selected microphone or sound card output will automatically be connected to to the
transmitter's microphone or line (rear panel) input based on the mode, and optionally frequency, reported by
the transceiver in response to polling by the application (logger) and/or Router. If Router is not able to read
the operating mode from your radio (radio does not have computer control port or does not report usable
mode information), you can select one of four fixed "no radio" modes or one "no radio" mode with manual
(keyboard/keypad) mode selection.
Many radios fail to provide a separate mode for digital operation or the serial control protocol
implemented by the radio does not report the digital mode when operating AFSK, PSK or
other audio based digital modes. This is true for all Kenwood transceivers, most TenTec
transceivers, most older Icom transceivers and the Elecraft K2. With those radios, digital
operation (except for FSK) must done using voice modes (USB or LSB).
The traditional method – feed the microphone jack from the sound card output through a
transformer – is not optimum for many reasons: you need to remember to turn off any speech
compressor and EDSP or other signal processing when using digital modulation operating
using in digital modes. In addition, the microphone amplifier in the radio can cause distortion
because it is optimized for voice and its frequency response is often not as flat as necessary
for digital modulating signals.
The proper method is to feed sound card audio to the microphone jack only for voice modes
(SSB, AM, FM) and to the jack designed for digital modes - generally on the transceiver's rear
panel – when using sound card based digital modes.
Even though the radio may not report a unique
DIGITAL mode, Router can make an intelligent choice
and apply the DIGITAL or VOICE configuration for
Audio and PTT based on the operating frequency from
the radio.
The VOICE/DIGITAL settings selector is used to control automatic switching when the
operating frequency is in the "Digital Band" as defined in the Digital Band Map and the transceiver is in
USB, LSB or FM mode.
Select by frequency: Router will select DIGITAL settings when detecting a frequency inside the "Digital
Mode" boundaries. These boundaries can be fully customized in the Band Map by clicking the
Digital Band Map button or selecting Router | Options | Digital Band Map.
Use VOICE settings: VOICE settings will be used regardless of frequency. This should be used with most
Yaesu transceivers, late model Icom transceivers that support USB-D and LSB-D and Elecrtaft K3.
Use DIGITAL setings: DIGITAL settings will be used regardless of detected frequency.
Sound Card: is only visible with Windows Vista. It displays the Mixer ID, Wave In ID and Wave Out ID for
each input/output.
Sound card overides microphone: When checked, audio from the sound card can overide signal from
microphone even if footswitch is depressed. "Restore serial PTT and audio routing" must be
selected on the PTT tab to avoid disabling audio from the sound card when the footswitch is
released.
microHAM © 2008 All rights reserved
AUDIO SWITCHING TAB
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