The Thelma Biotel 7.3 mm Acoustic Transmitter was originally designed for use with salmon smolt and is perfectly suited for small species where size is a limiting factor. The transmitter is suited for both manual tracking and automatic monitoring. The 7.3 mm transmitter has enabled researchers to study migration of wild Atlantic salmon smolt down to 13.5 cm in length and for periods in some cases up to one year of tag lifetime. It can be delivered both as Continuous Pingers and as ID Transmitters. The customer specifies pulse delay or coded ID, type of encoding, transmitting frequency and the average delay for ID transmitters. The tags are not just compatible with our own receivers, but can operate on standard code-sets (69 kHz) used by other equipment producers.
Physical Properties of LP7 Transmitter | |||
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LP7 | 2LP7 | MP7 | |
Diameter [mm] | 7.3 | 7.3 | 7.3 |
Length [mm] | 17 | 23.2 | 20.6 |
Power output [dB re 1 uPa at 1m] | 139 | 139 | 141 |
Weight in air [g] | 1.8 | 2.7 | 2.3 |
Weight in water [g] | 1.1 | 1.8 | 1.5 |
Estimated Battery Life for 7 mm Transmitters | |||
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Transmit Inteval [sec] | LP7 | 2LP7 | MP7 |
30 | 101 days | 6 months | 69 days |
60 | 152 days | 11 months | 122 days |
90 | 7 months | 14 months | 5 months |
120 | 8 months | 16 months | 6 months |