Characteristic Bat sounds heard onTranquillity II
 
Species Max Range Typical
TIME Switch Position
Sounds heard through loudspeaker
Time-expansion sounds
.
Ident
Tune kHz
ms
Heterodyne Sounds 
 
Duration
(secs)
Frequency range
kHz
Long Eared
20 ft
6 - 12
 
10
Short duration frequency varying chirp.  .
90 - 25
40
  Very Short duration ‘ticks’
15 to 25
Bechstein’s
20 ft
8 - 16
 
20
Double short duration chirps  
80 - 40
45 – 50   Very short duration ‘ticks’
20 to 30
.
Noctule 

sound

500 ft
20 - 25
 
40
Long duration frequency chirp     .
  20 - 25
320
Social calls as above
1
15 - 75
  Metallic ’chinks’ like echo-ing whiplash
5 to10
Lesser Horsehoe
20 ft
100- 115
115
1280
High frequency pulsed tone  
60 - 120
      Pleasant warbling tones
10 to 15
  .
80 - 100
 
1280
High frequency pulsed tone
40 - 100
Greater  

Horseshoe

50 ft
 .
85
  Pleasant warbling tones
8 to 11
Pipistrelle 

55 kHz

45 ft
50 - 60
 
20
Medium duration chirps  .
35 - 100
 .
50 - 65
  Hard ’clicks’ sometime with ‘watery’ effect
10 to 15
Pipistrelle 

45 kHz

45 ft
40 - 55
 .
20
Hard ‘clicks’ sometime with ‘watery’ effect . .
40 - 50
. .
10 to 15
35 - 90
Daubenton 
sound 
 
.
40 - 55
    Medium duration chirps  .  .
45 ft
30 - 100
30 - 100
20
 .
12 to 15
30 - 100
All species 

Using 280ms range

Using the 1280ms time position it will be probable that a feeding buzz will be captured. This gives rise to a ‘laughter’ effect (sound) & demonstrates the progressive increase in repetition rate when the bat is echo locating close to it’s prey. This range can also be used for social calls when there is a large gap between successive calls.
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