Specifications

- This function is used by software to mute the microphone during message (F1-Fn) PLAYBACK and avoid mixing

noise from the microphone with message. During playback, the microphone is muted; after the message is

completed the microphone is unmuted allowing VOX operation.

Note: manipulating the microphone controls (slider or select/mute box) in the RECORDING window has NO effect

because you are NOT recording. The recording controls are used only used when the logging software is

recording (Ctrl-Shift-Fn or Control-Fn) a message as a WAV file. To record, the RECORDING mic control

MUST be selected. The logging program usually handles this function automatically.

MK2R allows customizing the audio configuration to meet the needs of a specific logging program and

operating style (VOX, foot switch, computer generated transmit/receive switching, etc.) for each mode. In

addition, two sound cards (external for MK2R or internal for MK2R+) - one for CW and voice (USB Voice

CODEC or SC1) and one for digital modes (USB Audio CODEC or SC2) are selected automatically based

on radio mode and user preferences.

If the same mode (CW, voice, FSK, digital) is selected on both radios, the same sound card is used for

both radios, One channel is used for each radio – typically left channel to RADIO1 and right channel to

RADIO2. Output for the “unselected” radio is muted automatically when using Router DVK.

The output of the sound card or codec not being used for transmitting can be utilized for audio “feedback” -

software events/warnings, external spot announcements, or audio review. The output of this sound card

can be switched to the headphones under user control by selecting SC left or SC right to the left, right or

both ears. When RADIO 1 and RADIO 2 are in different modes (digital <-> voice/cw), each radio uses a

separate sound card or codec and the sound card output will not be connected to the headphones.

There are three distinct audio paths in MK2R and MK2R+. Each path is handled independently:

– from the transceiver fixed level audio outputs to the sound card input

– from the transceiver headphone output to the operator headphones

– from the sound card to the transceiver inputs including microphone switching

From transceiver fixed level audio outputs through MK2R to the sound card.

MK2R allows fully customizing audio selection of both radio outputs (or outputs

from both receivers if radios with dual receivers are used). Audio from the

transceiver “fixed level” outputs are connected to the SC2 line in (MK2R) or

USB Audio CODEC (MK2R+). The signal for each sound card channel is

selected using the LEFT (B16) and RIGHT (B17) buttons on the front panel.

The level for each channel is adjusted individually by the pots (16) and (17).

The + (B5) button can be used in conjunction with the LEFT (B16) and RIGHT

(B17) button to allow selecting more than one source to each sound card

channel. The selected sources are shown by the front panel lights (4) and (5).

Pressing the LEFT and RIGHT buttons at the same time connects the input of

SC2 or the USB Audio Codec to the MK2R headphone output. This is called

“What Your Hear” (WYH) and permits recording exactly the same audio as

heard in the headphones. The WYH light will illuminate when WYH mode is

selected.

Note: Audio to SC2 (MK2R) or USB Audio CODEC (MK2R+) DOES NOT CHANGE with the

transmit/receive state of the radios, the selected transmitter or selected receiver.