Advertisement
Microphone Setup:
Cardioid
Supercardioid
Hypercardioid
Ominidirectional
Figure 1:
PC Desktop Controls
Refer to Figure 1 for the following switch function descriptions-
Switch "A":
Select High-Pass switch position. Start with this switch set to the left
(flat response). If the mic is in a location where low frequency rumble
or wind noise is a encountered, moving this switch to the right will
help by reducing low frequency sensitivity.
Flat (
): Normal response.
High Pass (
): minimum 5 dB reduction in sensitivity at 100 Hz.
Switch "B":
Select preferred polar pattern. The cardioid polar pattern works
well for most installations. If feedback from a sound system occurs,
switching to the supercardioid or hypercardioid pattern will usually
allow increased mic gain before feedback. The omnidirectional
pattern is best suited for situations where there is no sound
reinforcement system present, such as for recording.
Switch "C" and "D":
Controls action of push-button switch on the top of the PC Desktop
microphone.
Momentary Modes:
When switch "C" is set to the left, the push-button (mute) switch
action is momentary.
In addition, If switch "D" is in the left hand position, the mic will
be in push-to-mute mode.
Alternately, If switch "D" is in the right hand position, the mic
will be in push-to-talk mode.
Toggle Modes:
When switch "C" is in the right hand position, the push-button
(mute) switch will be in toggle (push-on/push-off) mode.
With switch "C" in the right hand position, the setting of switch
"D" determines if the mic audio should be muted when power is
first applied.
If switch "D" is in the left hand position, the mic audio will be on
when power is first applied.
If switch "D" is in the right hand position, mic audio will be
muted when power is first applied.
Figure 2:
Bottom View
Switch "E" (Logic Mode Select):
When switch "E" is set in the left hand position, the PC Desktop
operates as a normal desk microphone. Mic muting and operation of
the LED is controlled by the push-button on the top of the mic. With
switch "E" in the right hand position, the mic will be in automatic
mixer mode, and the following will apply:
1.) Mic audio is always on.
2.) The automatic mixer controls LED operation and mic
muting.
Wiring:
For non-automatic mixer applications, the PC Desktop comes
equipped with a standard XLR style 3-pin male connector. For
automatic mixer applications, remove the XLR connector and service
the cable as needed.
Cable Connections:
Red –
Balanced Audio High
Black –
Balanced Audio Low
Shield –
Audio Ground
Green –
Logic Ground (Common to shield unless R45 is removed.
See Figure 3.)
White –
Switch Logic
Orange – LED Control
Logic Signals:
If the PC desktop mic is in momentary mode (see above section on
the mute switch), the logic level on the white wire will normally be
"high", and go "low" when the push-button is pressed. If the mute
switch is set for toggle mode, the logic will toggle from high to low,
or from low to high, each time the button is pressed. (If desired, a
pc board change can be done to force the logic to always be
momentary, regardless of switch settings. See Figure 3).
LED Control:
When the mic is in automatic mixer mode, a low logic signal on the
orange LED control wire will cause the LED to light.
Logic Ground Lift:
If necessary, the logic and audio grounds can be separated. This
requires removing a resistor from the pc board. See Figure 3.
Figure 3:
PC Board Detail
Advertisement
