Mk2R Operation; Setting Audio Levels - microHAM MK2R User Manual

For optimum operation in Voice and AFSK Digital modes, MK2R and Router requires proper drive levels.
Each control was explained in detail in the AUDIO SWITCHING, AUDIO MIXER and DVK sections.
Following a step-by-step approach will help you to set proper levels.
1. Open the Audio Mixer Tab of Router and confirm the proper sound cards are selected for both the
Voice (left side) and Digital (right side) functions. For MK2R+ choose USB Voice CODEC at the left
side and USB Audio CODEC at the right side. For MK2R select the system name of the sound card
connected to SC1 jacks (Voice) in the left side and the system name of the sound card connected to
the SC2 jacks (Digital) in the right side and select the proper mixer channel for each function
(microphone, line in, wave, etc.). Press both Get ID buttons and check to confirm that the correct
Sound Cards are selected. If not, restart Router.
2. Open MK2R top cover and check position of the jumpers for the three internal microphone preamps.
The first preamplifier (RECORDING – LIVE MIC) is used ONLY when the microphone is switched to
the sound card ("C" audio settings). The remaining two, one for RADIO1 and one for RADIO2 are
used ONLY when the microphone is directly switched to the radio ("A" audio settings).
RECORDING – LIVE MIC: This preamplifier is designed for use with dynamic microphones including the
Heil HC-4 or HC-5 elements. It makes the relatively low output of the dynamic microphones compatible with
the mic input of most sound cards (including the USB voice CODEC in MK2R+). Jumpers for the Recording
preamplifier are located on the upper circuit board behind and slightly to the right of the Mix control. This
preamp is enabled at the factory.
TIP: Turn off (disable) this preamplifier if you are using an electret (including Heil iC series)
microphone.
RADIO1, RADIO2: These preamps allow using dynamic microphones
(including the Heil HC4 and HC5 elements) with older Icom radios. The
RADIO1 and RADIO2 preamplifier jumpers are located on the right side
of the upper circuit board behind the Recording/Digital controls. These
preamplifiers are bypassed at the factory.
TIP: Enable the appropriate preamp if you are using an older
(non Pro series) Icom transceiver.
WARNING: Never mix types of microphone attached to the MK2R front
MIC jack and rear RJ45 MIC jack. Use both electret or both dynamic but
not one dynamic and one electret.
TIP: electret microphones can not be used unless both radios
are designed for use with an electret microphone and supply bias
on the mic line.
3. Set the RADIO1 and RADIO2 microphone trimmers (located just
to the front of the RADIO1 DC37) in middle of their range
(towards each other).
4. Set the front panel TX1 and TX2 knobs to 3 o'clock.
5. Press RADIO1 transmit focus button on MK2R front panel.
6. On the Audio Switching tab, select RADIO1 and set VOICE to:
"ACmA, voice codec SC1."
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6 - MK2R OPERATION

Setting Audio Levels

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