Powerful type minute sound hearing transmitter
KT-400D

Outline
  • It is catch minute sound transmitter in general use for tapping.
  • It is the same type as KT-400 and extended available distance to 300 meters.
  • Since the lithium battery is used, unlike a dry cell, regardless of external temperature or use time (inside of tolerance level), it operates in the state where it was always stabilized.
  • The available distance is 100-300 meters but, it may be shorter in the place where many houses and buildings are available.If Yagi antenna is used with the receiver, the distance will be extended to about 450 meters.
  • The (KUR-400) and conventional one for UHF band types sold in the market are available However, an exclusive receiver must be used when to catch a very low voice in whisper. Conventional one has a problem to hear due to noise makes by itself.
  • Prolonged automatic recording is made to the recorder of a commercial sound perception starting system.

Directions
  • Since there is a space which is made to slide the lid of a case at the point of the thumb, removes it, and puts a battery (lithium CR2) into an inside, a battery is put in there and a lid is carried out.
  • It is careful of the polarity of a battery to prevent mistakes.
  • An electric wave will be sent if the switch beside a case is put into the direction of a red mark. The rest is only established in a suitable place.
  • Although a 2mm hole is in a power supply switch side, since sound is taken in from the hole, installation which plugs up the hole is avoided.
  • An electric wave is transmitted having stood the antenna efficiently [ direction ] perpendicularly. In the inside of a building, and the place where the house builds and is crowded, how to transmit an electric wave becomes bad and a receivable distance becomes short. Notification distance will become short especially if it is in the state where an antenna adheres to a metal plate etc. Please separate an antenna centimeters [ several ] or more from a metal thing, and install it. Notification distance will become extremely short if it puts into inside, such as a metal box. As for notification distance, as for an antenna, 1/4 lambda strait wire becomes good somewhat from a helical antenna.
  • Automatic recording can also be carried out to the recorder with the commercial voice starting recording function using the recording code of attachment in an exclusive receiver (KUR-400). When you make it automatic recording, please be sure to carry out a check of operation. It checks whether make sound with pocket radio etc., an electric wave is made to send, there is no noise in a receiver, and it is finely audible. The recording code of receiver attachment is put with after that in the earphone terminal of a receiver, and the external microphone terminal of a recorder, it sets to sound starting, and a recording button is pushed. When there is no sound, please be sure to check whether the recording of a recorder has stopped. Since it is the mechanism recorded only when sound has been noticed, when required, it can be heard collectively later.
  • If the newest digital IC recorder is used, a part for 10 hours or more can be recorded continuously, and moreover, it can take in and save and reproduce in a personal computer.
Specification of KT-400D
    Powerful type minute sound hearing transmitter
    Moduratin system Narrow-band frequency modulation
        (maximum frequency deviation +- 10Khz)
    Supply voltage 3V (lithium battery CR-2)
    Consumption current About 15mA
    Continuation use time About 50 hours
    High frequency output about 10mW
    Dispatch frequency Three kinds
        A channel 398.605Mhz
        B channel 399.455Mhz
        C channel 399.030Mhz One either
    Unnecessary radiation -50db or less
    Antenna with a screw 1/4 lambda form memory type strait wire (18cm),
        Helical antenna with a screw
    Outside size 33mm long, 25mm wide, height 18mm
    Operating temperature -10 degrees C ~ 50 degree-C
    Weight About 43g
Notes
  • Be careful of the polarity of a battery to prevent mistakes absolutely. If a switch is turned ON by mistake, internal apparatus is damaged, and if it damages, there is danger of emitting smoke.
  • Please do not attach a magnet in a main part. An electric wave does not become weak or it stops coming out.