SMM-U1 Ultrasonic Microphone
The SMM-U1 is a highly sensitive, low noise ultrasonic microphone, designed for recording ultrasound up to 190 kHz. One or two microphones can be attached via the connector module. The microphone is powered 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 omni-directional SMM-U1 is ideal for unattended monitoring where the precise direction of bat activity is not known in advance. Polar plots are below.
SM3/SM4 Horn Attachment
The SM3/SM4 Horn Attachment turns the SMM-U1 omni-directional ultrasonic microphone into a highly directional microphone, while preserving call quality. The attachment is designed to be used without the standard microphone windscreen and remains weatherproof at angles up to 45-degrees.
Song Meter SM4BAT GPS Option
For researchers who have large geographic areas to cover, the GPS option is a valuable, time-saving tool. The Option logs recording locations and path information for transects. It also sets the Song Meter's clock to within one second of the GPS time base so you be assured that all of your recorders are accurate to the same clock.
SM3/SM4 Power Cable
The SM3/SM4 Power Cable allows your Song Meters to run on external battery power, or a complete solar panel charging system. Simply plug the cable into the recorder's power connector and connect the other end to the battery system using the included spade or ring terminals. Song Meters will handle external power sources from 4.5 to 17V DC and is protected against accidental reverse voltage.
Chosen for the Song Meter SM4BAT, SM4, SM3BAT and SM3, this lock will ensure your recorder's cover is secured. The unit features a brass body and cylinder to provide extra resistance to the elements. The marine grade lock is keyed alike, allowing multiple locks to open with the same key.
Weather Resistant Cable Lock
Specially selected for the Song Meter SM4BAT, SM4, SM3BAT and SM3, the adjustable locking mechanism holds the 6'/1.8m cable tight in any position for a secure fit. The unit features a weather resistant lock and vinyl coated 5/16"/8mm braided steel cable. Note: Lock is keyed differently.
Created to keep prying teeth and claws away from your SM4 and SM4BAT, the custom designed Armor accessory is the best solution for maximum protection. Armor encases your Song Meter in an indestructible steel structure coated in a durable powder epoxy finished. It also protects cable and power connections, and provides visibility of the unit's LED light.
Since ultrasound is beyond the range of human hearing, verifying proper system and microphone performance can be a challenge. The Ultrasonic Calibrator is designed to verify the sensitivity of SM3-U1 microphones. It also verifies overall system performance.
Microphone Frequency Responses
The chart below illustrates the frequency response of the SMM-U1 microphone. The subsequent graphs display the directionality plots of the SMM-U1 microphone with and without the directional SMX-Horn. Please click on the graph for larger viewing.
The following polar plots indicate microphone directional sensitivity with and without the SM3-Horn.