microHAM micro2R u2R User Manual page 29

From the sound card and microphone to the transceivers.
Audio to the transceivers can come from two sources - from the computer sound card or from the
microphone. Due to the unique microphone handling in micro2R, the microphone signal can go to the
sound card and to the transmit audio selection circuit at the same time.
In VOICE mode there are two operating configurations:
1. When the Disable audio switching on RADIO1/2 check box is
unselected audio from the microphone is connected to the
transceiver which has TX focus. Sound card output is switched
to the microphone jack only for DVK playback when the
computer generates a PTT signal through the virtual serial port,
WinKey, microHAM protocol or LPT port.
2. When the Disable audio switching on RADIO1/2 check box is selected audio from the
microphone is disconnected from transceiver but remains connected to the sound card. The sound
card output is connected to the transceiver input all the time.
NOTE: To use this configuration your sound card MUST support local microphone echo described at
the beginning of this chapter.
Computer PTT overrides microphone: When checked, audio from the sound card will override the
microphone even if footswitch is depressed. "Restore serial PTT and audio routing" must be selected
on the PTT tab to prevent audio from the sound card from being disabled when the footswitch is
released.
Sound Card: is only visible with Vista
and Windows 7. It shows the Name,
Mixer ID, Wave In ID and Wave Out ID
for each input/output in the computer.
The ID numbers are necessary to
configure some applications (for
example: WSJT, MMVARI etc.).
NOTE: Audio Switching is set
independently for RADIO1 and RADIO2.
Be sure to configure both!
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By default, when "Disable audio switching on RADIO1/2" boxes are not
checked, the microphone is connected to the radio which has TX focus. The
transceiver microphone input is disconnected from the operator microphone
and switched to the sound card output only when the computer initiates
transmission and generates a PTT signal.
The transmit audio level is set by the RADIO1 and RADIO2 pots on front
panel. These pots control only the audio generated by (or passing through)
the computer sound card.
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