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Bat

box

www.batbox.com 

 email: [email protected]

Leaflet design : www

.harwoodcr

eative.co.uk

Front - Concertina fold

Bat

box 

Duet

  

bat detector : 

user guide 

Frequency Division and  
Heterodyne Operation

The 

Bat

box

 

Duet

 

is a dual-

functioning bat detector, with 

both frequency division 

and heterodyne 

operation, 

which has been 

designed for 

single-handed 

operation.  

The large LCD 

back-lit display is 

extremely accurate 

and easy to 

read at all 

light levels. 

A reference 

button has 

been incorporated 

for adding voice 

commentary, 

whilst recording. 

The unit is very easy 

to use and comes 

supplied with a soft  

carrying case.  

IMPORTANT

Please read these instructions before 
using your Bat

box

 Duet bat detector

Summary of Contents for Duet

Page 1: ... which has been designed for single handed operation The large LCD back lit display is extremely accurate and easy to read at all light levels A reference button has been incorporated for adding voice commentary whilst recording The unit is very easy to use and comes supplied with a soft carrying case IMPORTANT Please read these instructions before using your Batbox Duet bat detector ...

Page 2: ... rarer Pipistrellus nathusii 39 40 kHz Although it is possible to find these frequencies using the heterodyne section of the Batbox Duet a certain amount of subjectivity is involved When the bat is moving at speed and might only make one pass there may not be time to tune in to the peak frequency By recording from the frequency division output no bat can be missed regardless of the frequency set o...

Page 3: ...e nearest 1kHz When the detector is tuned to the peak frequency of a bat call there is in theory zero frequency output In practice because the bat is in motion the calls will always be heard but the lower the pitch of the output the closer the local oscillator frequency is to that of the bat s peak frequency CONNECTION TO RECORDING DEVICE MP3 minidisc tape etc Batbox Duet will record both frequenc...

Page 4: ... the microphone rather than into it This will allow undistorted commentary and ensure that no moisture enters the microphone BACKLIGHT The backlight behind the LCD display will not be apparent in daylight but as light levels go down sufficient light to read the display will be apparent without being so bright as to spoil night vision BATTERY LOW INDICATOR When the battery voltage drops below 7 vol...

Page 5: ...corder with an input level control This can sometimes be in the form of an AGC Automatic Gain Control in the cheaper recorders but far better is to use one with a manual level control which does not interfere with the recorded pulses and produces less background noise Poor recordings i e record levels too low or high will not give much useful information so a single pass by a distant bat will almo...

Page 6: ...To change the sample rate go to File Properties Choose from select Recording formats from the drop down menu then click Convert Now Choose 44100 16 Bit Stereo and click OK You will need to go to the OPTIONS tab and select the line input for record as described earlier Remember to label the recording with a cryptic file name related to the place date or species recorded You should always have a new...

Page 7: ...important that you get used to using the bat detector and recorder before expecting perfect results and definitive recordings Just as you would have to get used to using any other sophisticated tool you will need to practise Firstly get used to plugging in your recorder headphones etc in daylight as you will find it very difficult to set up your system and adjust recording levels whilst holding a ...

Page 8: ...enser Range 17kHz 125kHz Ref Momentary voice commentary button to left channel GENERAL Suitable recording formats MP3 DAT MiniDisc compact cassette Speaker weatherproof 35mm Amplifier 350mW max Power supply 1 x 9v PP3 Quiescent current 22mA Wrist strap high strength polyester woven cord Case fitted soft nylon micro weave with zip and belt loop Dimensions 125 x 69 x 32 mm Weight 147gm without batte...

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