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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
|
Emkay
FG Series |
UltraSoundGate
CM16/CMPA-P48 |
| Part # |
41001 |
40012 |
| Microphone principle |
pre-polarized condenser
(electret) |
externally polarized condenser (200V) |
|
|
|
| Relative flatness of
the frequency response |
low
(see frequency response)
|
medium
(see frequency response)
|
| Approximate self-noise level 20 ...
60 kHz |
35 dB |
28 dB |
| Approximate sensitivity |
25 mV/Pa |
50 mV/Pa |
| Phantom power requirements
|
48V, 10 mA |
48V, 10 mA
|
Durability of the
diaphragm |
high |
low ... medium |
| Reliability in high-humidity
environments |
high |
medium |
| Total size [mm] |
19 x 19 x 47 |
36 x 36 x 120 |
| Weight |
30g |
155g
(including CMPA) |
| Price (including mini
tripod and 2m XLR cable) |
EUR 420 |
EUR 1100
(including spare capsule and water-proof transport box) |
|
Note that the frequency responses of most 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. The diagram below shows a typical frequency response of a 192 kHz CF-card recorder:
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 116-200).
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