heterodyne detector การใช้

• Heterodyne detectors are the most commonly used, and most self-build detectors are of this type.
• The frequency changes of CF calls are not exaggerated as with a heterodyne detector and so are less noticeable.
• A better quality version of a heterodyne, or direct conversion, bat detector is the super-heterodyne detector.
• Advantages, As with a heterodyne detector, an FD detector works in real time with or without a heterodyne function.
• HgCdTe can be used as a heterodyne detector, in which the interference between a local source and returned laser light is detected.
• They are frequently referred to as " 45 Pips " and " 55 Pips " from the calls as heard on a heterodyne detector.
• This and other sophisticated FD detectors also include a heterodyne detector and provide a jack output so that independent outputs can be recorded for later analysis.
• Dual FD / heterodyne detectors are useful for cross country transects especially when there is a function provided for recording voice notes such as times, locations and recognised bat calls.
• Stereo listening and recording is possible with models such as the CSE stereo heterodyne detector ( broken link ! ), and this can help to track bats when visibility is poor.
• A FD detector does not require manual tuning as it works on a full range of bat frequencies, but some, like the Duet, also have a heterodyne detector built in.