Specifications

If dual foot switch operation is selected, pressing a foot switch will not change TX focus. When the foot

switch of the unselected radio is pressed, MK2R moves TX focus to this radio temporarily. When the foot

switch is released, MK2R returns to focus to the selected radio and resumes AUTO focus.

Understanding Headphone Switching

Like TX focus, headphone switching can operate in, MANUAL and AUTO modes.

Manual headphone switching

In manual mode the operator has several ways to control

what he hears in the headphones. There are “small preset”

buttons RADIO1 (B7), BOTH (B8) and RADIO2 (B9) as well

as the “full access” LEFT EAR (B4), RIGHT EAR (B6) and

“shift” + (B5) buttons.

RADIO1, BOTH and RADIO2 buttons are designed for

quickly switching the headphones to a particular radio.

RADIO1, BOTH and RADIO2 buttons are called “small

preset” because MK2R allows the operator to customize

which VFO will be switched to each ear when selected.

The factory defaults are:

LEFT EAR RIGHT EAR

RADIO 1 RADIO 1 - VFO A RADIO 1 - VFO B

BOTH RADIO 1 - VFO A RADIO 2 – VFO A

RADIO 2 RADIO 2 – VFO A RADIO 2 – VFO B

The operator can customize settings for each button by holding that button and cycling through the

available choices with the LEFT EAR and RIGHT EAR buttons. Any changes to the “small preset” buttons

are automatically stored in MK2R EEPROM and does not need to be customized after each power up.

The LEFT EAR, + and RIGHT EAR buttons are used for “full access” to headphone audio switching.

MK2R includes an internal 6 x 2 crosspoint switch that allows switching any of six audio sources to each

earphone. These sources are VFO A/B of RADIO1 and RADIO2 and left/right channel of the unused

sound card. Selecting the desired source for each ear is accomplished by stepping through the available

options with the LEFT EAR or RIGHT EAR button. Additional sources can be selected by holding the '+'

button and stepping through the available sources again. The selected sources are indicated by lights

above buttons (2) for left ear and (3) for right ear.

When SC L (left) or SC R (right) channel of sound card is selected, MK2R will switch the UNUSED sound

card to the headphones. The “unused sound card” depends on mode of both radios.

If both radios are in CW, LSB or USB modes and audio switching is set for “(Voice codec, SC1)” on

the Audio Switching tab, the output of SC2 (MK2R) or USB Audio Codec (MK2R+) is switched to

the headphones.

If both radios are in Digital mode and audio switching is set for “(Audio codec SC2)” on the Audio

Switching tab, the output of SC1 (MK2R) or the USB Voice Codec (NK2R+) is switched to the

headphones.