Understanding Headphone Switching - microHAM MK2R User Manual

Like transmit focus, headphone switching (receive focus) can operate in MANUAL or 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
RADIO 1 - VFO A
RADIO 1
RADIO 1 - VFO A
BOTH
RADIO 2 RADIO 2 – VFO A
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 EEPROM and do 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.
If one radio is in CW, LSB or USB using "Voice codec SC1" and one radio is in digital mode using "Audio
Codec SC2" NO sound card will be connected to the headphones (both are in use) even if SC is
selected for the headphones.
TIP: To confirm that your logging program, digital program, or DVK is sending audio to the radio you
can temporary monitor the output of the transmit sound card in the headphones by holding the "+"
button and pressing the appropriate RADIO button. While you hold this combination, you will hear
the transmit audio in both headphones.
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Understanding Headphone Switching

RIGHT EAR
RADIO 1 - VFO B
RADIO 2 – VFO A
RADIO 2 – VFO B
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