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Animal Acoustic Communication
Avisoft Bioacoustics
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16548 Glienicke
Germany

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Ultrasound Microphones for CF Card and HDD Recorders that provide P48 Phantom Power


Avisoft Bioacoustics offers two phantom-powered ultrasound microphone models that are compatible to the CF-card recorders TASCAM HD-P2, Fostex FR-2 & FR-2LE, Sound Devices 702 & 722, Marantz PMD671, M-Audio Microtrack 24/96 and various computer audio interfaces that provide the required 48V phantom power:
Microphone model
Knowles
FG Series
UltraSoundGate
CM16/CMPA-P48
Part # 41001 40012
Microphone principle pre-polarized condenser
(electret)
externally polarized condenser (200V)

Emkay electret
UltraSoundGate condenser microphone CM16/CMPA

Relative flatness of the frequency response poor
(see frequency response)
good
(see frequency response)
Approximate self-noise level 30 ... 50 kHz 26 dB 18 dB
Approximate sensitivity 500 mV/Pa 500 mV/Pa
Phantom power requirements 48V, 10 mA 48V, 10 mA
Durability of the diaphragm good very good
Reliability in high-humidity environments good good
Total size [mm] 19 x 19 x 47 36 x 36 x 120
Weight 40g 155g
(including CMPA)
Note that the frequency responses of many CF-card recorders (certainly at the 192 kHz sample rate) are not optimal for recording ultrasounds above about 60 kHz. The aliasing performance (rejection of signal components at frequencies above the nyquist frequency) is not satisfying and might reduce the effectively usable bandwidth.

For recording higher ultrasounds, it is therefore recommended to use a recording system that supports sample rates higher than 192 kHz and more appropriate frequency responses (for instance the UltraSoundGate 116Hm).
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© 2006 Avisoft Bioacoustics

last modified on 05 September 2016

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