SM3BAT Setup
SM3BAT User Guide
page
12
BIOACOUSTIC MONITORING SYSTEMS
NOTE
: Mounting cabled microphones on ungrounded non-conductive masts
especially in dry and windy conditions, could result in damage to the microphones or
recorder due to electrostatic build up or lightning. Such damage is not covered under
warranty so please check with a professional/licensed electrician or installer of outdoor
antennas, weather instruments or the like for advice suitable to your specific situation.
3.2.1
SMM-U1 Ultrasonic Microphone
The SMM-U1 is a highly sensitive and low noise ultrasonic microphone designed
for recording ultrasound up to 190 kHz. One or two microphones can be attached
via the connector module.
NOTE:
The discontinued SM3-U1 Ultrasonic Microphone is electronically identical to
the SMM-U1, but comes in a larger plastic microphone enclosure. All the information
in this section also applies to the SM3-U1.
The SMM-U1 is a powered microphone
and can be used with up to 100 meters
of cable with no attenuation or
degradation. The microphone has a
differential output, which significantly
reduces noise from electromagnetic
sources.
The omnidirectional SMM-U1 is ideal for
unattended monitoring where the
precise direction of bat activity is not known in advance. See the specifications
chapter for polar plots. For applications requiring directionality, the microphone
can be adapted for directional sensitivity with the available SM3 Horn Attachment.
The SMM-U1 microphone features a hydrophobic membrane transparent to
acoustic or ultrasound signals to prevent unpressurized water from entering the
microphone. In gusty windblown rain,
water may pass the membrane and the
included windscreen should be installed so as to protect the internal ultrasonic
transducer from water damage. We also recommend positioning the microphone
so that they point parallel to the ground, or even slightly downward, so as to
minimize water entry.
3.2.2
How to Connect the SM3-Horn
Attachment
The available SM3 Horn Attachment turns our
SMM-U1 omnidirectional ultrasonic microphone
into a highly directional microphone, while
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